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Studer A Series - Harman Professional

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3. C21 R49 C45 Rd5 R44 R42 R41 R40 RT300 Em C342 R332 R333 R R342 R M R382 R378 R931 e RFO 2 2 074 C324 C334 nes C amp R380 WES D372 C326 C336 25 C380 2 DE RF amp A R55 D 5 RFG Oo C3 C390 8 R323 R339 854 R370 R328 R338 RFS C52 R390 ESSE q I ii U3 UD3 U2 CET R30 REA R64 R305 RE2 861 R301 REI o REO C309 REQ RE a D eRT4 z 8302 REG O nu RT3 R245 RD4 RC4 RD2 B RC2 0219 RDO RCO R217 RD RC RD o RC O C RD6 O RCG O RDS RC5 CD1 CC1 UD2 UD1
4. I eee RP2 RN2 j CPS Ne CNS 23 253 R278 CP4 CN4 C R382 C18 72454 C303 8389 372 300 CP8 CN8 2 2 5 336 C388 FE RN8 ME Jf FN R333 R306 am TE E R370 R338 R304 P7 CN RT390 ee GF I Rord RO2 RM2 8 UA U3 COS CMS C21 E R373 RM1 HERE RM C381 R3TS 553 C04 582 CM4 C22 Al R381 C3 R323 R316 C08 SS 5 5 R326 R314 ROB RM8 9 s 78 C06 CM6 R21 m 6324 Rr rs Mea 004 VM 4577 C326 C318 ROG RNG R29 E E H GND 1 R L uD5 UD6 UD 008 242 RT200 TRRF3 242 R241 RJ RL2 278 CJ5 peter CLS C32 10274 C2
5. C288 R28 R29 B R22 R24 B B RSB 542 UDL C40 845 ROA 818 ROA 878 RT200 RSA NI N C3 N R280 J R204 NI R 285 als 8018274 O R290 re U4 NI C281 R273 E RT290 2 R249 N 3 C3 CIA C103 m R104 R106 C R51 R55 2 92 LED a transformer VARIAC Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 3 1 A1 Settings on the PCB 4 3 1 1 A1 Required Test Tools T1 Variable mains transformer variac Al True RMS AC amm
6. Type Value Limits System polarity 14 dBV 250 mVews 120 Hz sine wave 1 Phase 0 20 Note Without compensation the microphone Br el amp Kjaer BK4133 2639 is inverting 4 5 2 8 A5 Overall Phase Check e Place the measurement microphone again on axis according to 4 5 2 4 distance 0 806 m Set the phasemeter propagation delay time to 2 91 ms corresponding to a distance of 1 m Set balanced generator to 250 mVRMS i e 12 0 dBV or 9 8 dBu e Plot a phase sweep 20 Hz 20 kHz according to the graph below e If the result is above the tolerance increase the microphone distance or if the result is below the tolerance decrease the microphone distance and re peat the phase sweep Date printed 29 02 00 Service E4 35 A Series Active Monitor Speakers STUDER 4 6 Appendix Frequency Response Measurements 4 6 1 General Most parts of the following paragraphs are reprinted with kind permission of Audio Precision Inc http www audioprecision com Frequency response measurement of loudspeakers is a much more complex topic than response measurements on amplifiers or most other electronic audio products Nearfield effects cause the response measured with close microphone spacing to vary from that with distant microphone placement Loudspeakers are directional so the response varie
7. 4 32 432 5 X dnsulauon Check s 4 32 4 5 24 Measurement Setup the Anechoic ROOM 4 33 45 2455 EQ PHnec E adt te EA 34 23 2 0 AS Distortion C Deck 4 34 4527 AS Checkout pt p 4 35 Zo 90 401 kuham 4 35 4 6 Appendix Frequency Response Measurements E4 36 4 6 1 T E E4 36 4 6 2 Standing Waves Reflections and 5 1 eene nene nennen nas 4 36 4 6 3 MLS Technology for Frequency Response Measurements EA 37 4 6 4 Quasi Anechoic Measurements and Low Frequency Limitations 4 38 4 6 5 NIDS XO0 4 39 DULCI ee ES 0 2 Contents Date printed 29 02 00 STUDER 1 WELCOME 1 1 Basics Negative output impedance Date printed 29 02 00 A Series Active Monitor Speakers We are happy to welcome you in the circle of the users of Studer s A series active speakers and we felicitate you on your selection Thanks to Studer s ex
8. A Series Active Monitor Speakers STUDER A3 HF AMP T BED 8 L teca 330 OLCH lt 0818 1 9 58 s iii B 0558 SECTION 5 A Series Active Monitor Speakers STUDER A3 LF AMP am R282 1 R283 B V ON OFF R270 d SECTION 5 STUDER A3 Multipin Connector A3 OVERALL DIAGRAM Series Active Monitor Speakers SECTION 5 SGTUDER Series Active Monitor Speakers aa dc ir lade da la bly ely fe 635 Leo 600 R 2 Wy OPW jj feo se jug PETERE MET ni ir 25 d CF RFO UD3 SECTION 5 STUDER A3 Parts List Ref C0 C2 C3 Vt c5 C6 C11 C12 C13 C14 C15 C18 C20 C21 C22 C24 C32 C33 C38 C41 C45 C51 C52 C203 C208 C214 C216 C219 C240 0242 C243 C246 C249 C280 C281 C290 Value not used Polyester 7 5 mm 220 nF 100 V Electrolytic radial 3300 uF 50 V eL LEANN L IVV U Uly Uv jauiar H LX Electrolytic radial 3300 uF 50 V Electrolytic radial 3300 uF 50 V Electrolyti
9. X 2 1 202 E2 1 2 37 Block E2 2 2 4 Technical Specuications ee E2 3 S E3 1 3 1 Connectors PR E3 1 4 Service liinai lestie EA 1 4 1 M EA 1 4 2 Spare PAV 52 s EA 1 S XE We n E4 2 4 3 1 201 Ob WIE Pe sles ac nce les tates tele 4 3 Soul Regured Lest e EMI 4 3 23 102 01 Rittal CCC Se 4 3 T Lo 2002 4 3 sau EA 3 4 3 1 5 Input Gain Check and EQ 4 4 4 3 1 6 Input Common Mode Rejection Ratio CMMR 6 4 5 AF Ovesen Cornen 222110 4 5 2515 Al WOOLCE MICE COUEDUL eto tee leon etos tes sasa 4 6 4 519 weecter Ampun OUMU
10. Al Delay RSA C1A ROA s Wu um lt mb a x Q oe ND oe s s s s ss ADJA Cm w lt ap cw ee Gum s s s s R2A 15 V R5B ADJ B R2B OUT B C3B s e cu x ce CAD s GR x s s x Ix IZ gc x s SECTION 5 A Series Active Monitor Speakers STUDER 9 1828 19Z9 0620 1 2924 0822 28 0 2 3 1 Al HF AMP 0629 B 912 SECTION 5 STUDER A Series Active Monitor Speakers Al LF AMP g j 80 vi 1810 esra 0619 100 0619 06118 0614 EE 2814 0119 2 082
11. 9 2 ms for floor 2 spaced 1 5 m Audio Precision True anechoic response with even moderate accuracy down to 35 Hz would require that the first reflection path to be at least 28 ms longer than the di rect signal path This requires a room with the nearest reflecting surface at least 5 m away This calls for a room with a 10 m high ceiling with the speaker and microphone on 5 m tall stands E4 38 Service Date printed 29 02 00 STUDER 4 6 5 MLS Advantages Date printed 29 02 00 A Series Active Monitor Speakers The maximum length sequence MLS test signal is a pseudo random noise with special properties which allow analysis of response without the vari ability commonly associated with noise based measurements The analysis technique provides a high degree of immunity from interfering noise allow ing accurate measurements when the interference actually exceeds the test signal level The MLS signal more closely resembles program material than does a sinewave and will therefore measure under conditions approximating normal use The MLS technique has several significant advantages over either basic impulse testing or the TDS technique The principal advantage of MLS over impulse testing is in signal to noise ratio improvement Compared to the TDS technique MLS testing has a number of advantages To obtain low frequency response data TDS must sweep very slowly MLS has the same testing time whether evaluating
12. e Plot a 20 Hz 20 kHz THD sweep 1 m lt 1 75 Hz 15 kHz THD N Hz Date printed 29 02 00 Service E4 11 A Series Active Monitor Speakers STUDER 4 3 2 7 A1 Polarity Check e Place the measurement microphone at a distance of 10 cm from the baffle and exactly in the center of the woofer Generator Measuement Description Id 7 Type Value Limits System polarity 14 dBV 245 mVews 120 Hz sine 1 Phase 0 20 Note Without compensation the microphone Br el amp Kjaer BK4133 2639 is inverting 4 3 2 8 A1 Overall Phase Check e Place the measurement microphone again on axis according to 4 3 2 4 distance 0 806 m Set the phasemeter propagation delay time to 2 91 ms corresponding to a distance of 1 m Set balanced generator to 245 mVRMS i e 12 2 dBV or 10 dBu e Plot a phase sweep 20 Hz 20 kHz according to the graph below e If the result is above the tolerance increase the microphone distance or if the result is below the tolerance decrease the microphone distance and re peat the phase sweep Phase E4 12 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 4 Service Measurement setup diagram
13. STUDER prefeasio i nal audio equipment Studer Series Active Monitor Speakers Operating and Service Instructions Prepared and edited by Copyright by Studer Professional Audio GmbH Studer Professional Audio GmbH Printed in Switzerland Technical Documentation Order no 10 27 4540 Ed 0400 Althardstrasse 30 CH 8105 Regensdorf Switzerland http www studer ch Subject to change Studer is a registered trade mark of Studer Professional Audio GmbH Regensdorf STUDER Safety Information A Safety Information CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION To reduce the risk of electric shock do not remove covers or back No RISQUE DE CHOC ELECTRIQUE user serviceable parts inside Refer servicing to qualified service person NE PAS OUVRIR ACHTUNG GEFAHR ELEKTRISCHER SCHLAG NICHT FFNEN nel This symbol is intended to alert the user to presence of un insulated dan gerous voltage within the equipment that may be of sufficient magnitude to constitute a risk of electric shock to a person This symbol is intended to alert the user to the presence of important in structions for operating and maintenance in the enclosed documentation ESSI Assemblies or sub assemblies of this product can contain opto electronic devices long as these devices comply with Class I of laser or LED products according to EN 60825 1 1994 they will not be
14. ens A3 LF IN Standby 45 V OUT R249 E Eu JA 5 6 7 R291 C249 L R246 C246 21 J4 8 9 10 R292 C291 R248 R247 15 V O A3 POWER SUPPLY R7 Over Temp g Standby 2 GNO J413 14 STUDER A Series Active Monitor Speakers A3 Power Supply gt KD q 4 T 18 15 V Q2 Q1 DZ2 C12 DZ1 C13 R1 7 T R12 R R11 T OSverTemp_ gt 4 DZ3 T NTC1 R3 R C5 C11 Cs Z R C2 CO C14 C15 1 Jt12p 1 Jt13p 1 SECTION 5 A Series Active Monitor Speakers STUDER A3 Delay BLX AB E RXO RX5 RX8 RX7 UD A BLA UD1A ADJX TORTI BL B UD2A TORT2 BL E UD3A TO GND CX9 RX4 beo omoes momo oom oom homo oom Um mm mmm mmm mmm mmm mmm mmm oom ammo mom mom om oom o 47 lt 4 4 BL Y C D F RYO cy RY5 ae TORTS RY1 RY2 4 1 1 1 4 UD B BLC UD1B TORT4 BL D UD2B BL F UD3B TO GND RY6 Oe se see nen ee ee ee teat ana a ee Om OO ee Oe mw ee we a me a me a EE SECTION 5
15. me xx C249 gt R246 V LH OUTH pha 291 UD1B PHC R247 INH PH lt OUTS pg a RT3 C142 C126 R141 R128 R123 USB gt E 40 N gt gt Ez tQ o D BLG 4028 ING 6 R116 w LF OUTF C116 RT2 R142 L UD3B C124 R145 A5 LF AMP OUTE pg a xd d n UD4B H INE PE BLD GND UD4A V IND BLC tly BLE mi 415V Standby OUT T R191 Woofer mamme a R192 R148 R147 L GND UD3A HH BLB Hiv SUTB 171 GND UD2A t V INB BLA RR v peno 0 0013 V INA AS DELAY L A5 POWER SUPPLY Over Temp Standby J5 D LEDR dere SECTION 5 Series Active Monitor Speakers STUDER A5 Power Supply ASL dua J9AO M SECTION 5 A Series Active Monitor Speakers STUDER A5 A5 Delay UD A BLA UD1A B
16. 0810 QP SECTION 5 A Series Active Monitor Speakers STUDER J3 J2 Layout 5 2 C m 84 SECTION 5 A Series Active Monitor Speakers Parts List Ref C2 C3 C4 C12 C13 C14 C15 40 C21 C22 C23 C24 C40 C41 C45 052 C103 C108 C114 C116 C140 C142 C143 C146 C180 C181 C190 C191 C203 C208 C240 9 C TV C241 C242 C246 C280 C281 C290 C291 CA1 CA3 CA9 CB1 CB3 CB9 D191 D192 D291 D292 DZ1 DZ2 J1 J2 J3 44 5 4411 Jt12 Jt13 STUDER Value Polyester 7 5 mm 100 nF 100V Electrolytic radial 3300 uF 50 V Flectrolvtic radial 3300 uF 50 V Electrolytic radial 22 uF 63 V Electrolytic radial 22 uF 63 V Polyester 7 5mm 100 nF 100 V Polyester 7 5 mm 100 nF 100 V radial 22418 VIY UG 22 HI 7 wo v Electrolytic radial 22 uF 63 V Ceramic 47 pF Electrolytic radial 22 uF V Ceramic 47 pF Polyester 7 5 mm 470 nF 100 V Electrolytic radial 22 uF 3 V Electrolytic radial 470 uF 25 V Ceramic 100 pF Polyester 7 5 mm 220 nF 100 V Polyester 7 5 mm 220 nF 100 V Polyester 7 5 mm 1 nF 6 0 V Polyester 7 5 mm 22 nF 250 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Polyester 7 5 mm 4 7 nF 400 V Electrolytic radial 22 uF 63 V Ceramic 220 pF Ceramic 2
17. 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 1 nF 630 V Ceramic 100 pF not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ref CK2 CK4 5 CK8 CL2 CL4 CL6 CL7 CL8 CM2 CM4 CMS OMA CM CM8 CN2 CN4 CN5 CN6 CN CN8 CO2 CO4 COS CO6 008 CP2 CP4 CPS CP6 8 D171 D172 D173 D174 D191 D192 D271 D272 D273 D274 D291 D292 D371 D372 D373 D374 D391 D392 DZ1 DZ2 DZ3 DZ4 Value not used not used not used notuscd not used not used Ceramic 100 pF not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 2 2 nF 030 V Polyester 7 5 mm 2 2 nF 630 V not used Polyester 7 5 mm 1 nF 630 V 7 hmm 2 16240 V r oiyesier omm 2 2 r 029 V Polyester 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V not used not used not used not used not used not used Ceramic 100 pF Ceramic 100 pF not used Polyester 7 5mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF not
18. 24 4 5 1 PND OMME gt uy arent Mm 4 25 Ala AS TS 0018 4 25 42 22 201 DOLOS 0 0 eee 4 25 512 POWELL UD nun NM CN LM ML M E4 25 45 14 AS Vol 865 25 52588 u teu 4 25 4 5 1 5 Input Gain Check and EQ PreadjJustments E4 26 4 5 1 6 5 Input Common Mode Rejection Ratio 4 27 2501 7 AS Quiescent Current Seine 222 aM 4 28 4 5 1 8 A Wooler Amplifier mrt a E4 28 ALS AS Mid ranac Am 16 ONDU um u E4 29 AS deese cosi 4 30 232 Emet GN CA EA 31 4 3 1 12 Ao Overheat Protecuonm obe ha Db tue EA 31 4 5 2 AO Checks on heasse mble dc UM us Oe ayka 4 32 4 3 2 1 AS REGU d 4 32 q3 2 2 Amal 5 eto divise SU
19. 33k 0 5 W Rectifier B80C2300 1500 Rectifier 1A 250 V DIL4 Rectifier 1A 250 V DIL4 Potentiometer 10k horizonte PCB mount Trimmer potentiometer 2k vertical Trimmer potentiometer 2k vertical Trimmer potentiometer 10k vertical Trimmer potentiometer 2k vertical Trimmer potentiometer 10k vertical TLO 2CP dual opamp TLO72CP dual opamp TLO72CP dual opamp TLO72CP dual opamp TLO 2CP dual opamp STUDER A3 Overall Diagram R43 5 2 040 R49 C5 pes 52 RP2 eM R51 R53 BLB v ADJ B I ru SND erty INB BLA Liy ADJA GND V INA R301 C303 te OUTF ADJF UD3B INF OUTE ADJE SND V INE OUT C ADJ C UD1B INC VL A3 DELAY R304 Series Active Monitor Speakers R206 C208 R314 15 C342 R61 R63 SECTION 5 R331 R332 R341 epe BEN A3 HE E R349 R333 8 U3B gt a 7 C349 R338 R339 C334 C336 R243 6243 X C242 C216 224 R241 R242 R248 R217 4 221 C219 C214
20. Appendix 2 PE IEC 320 C13 IEC 320 C19 Female plug IEC320 front side view Class III Equipment Battery Operation up to 60 Equipment of this protection class must be earthed using the provided earth terminal if one or more external signals are connected to the unit see ex planation at the beginning of this paragraph B4 Electromagnetic Compatibility EMC The unit conforms to the protection requirements relevant to electromag netic phenomena that are listed in the guidelines 89 336 EC and FCC part 15 The electromagnetic interference generated by the unit is limited in such a way that other equipment and systems can be operated normally The unit is adequately protected against electromagnetic interference so that it can operate properly The unit has been tested and conforms to the EMC standards of the speci fied electromagnetic environment as listed in the following declaration The limits of these standards ensure protection of the environment and cor responding noise immunity of the equipment with appropriate probability However a professional installation and integration within the system are imperative prerequisites for operation without EMC problems For this purpose the following measures must be followed Install the equipment in accordance with the operating instructions Use the supplied accessories In the system and in the vicinity where the equipment is installed use only
21. Jt21 Flat pin 4 8 mm R24 1k 0 5 W R273 47Q 0 5W Jt22 Flat pin 4 8 mm R33 2k2 0 5 W R274 47910570 423 Flat pin 4 8 mm R34 10k 0 5 W R275 47Q 0 5W R36 282 0 5 W R276 47Q 0 5W NTC1 150k thread M3 R38 not used R277 330Q 0 5 W R39 10k 0 5 W R278 3300 0 5 W Q1 TIP127 PNP R40 2200 05W R279 22k 0 5 W Q2 TIP122 NPN R41 33k 0 5 W R280 1009 0 5 W Q3 TIP127 PNP R42 33k 0 5 W R281 1000 0 5 W Q4 TIP122 NPN R43 33k 0 5 W R282 19 20 Q40 BS170 FET R44 4762105 W R283 19 210 Q171 BC556B PNP R45 47Q 05W R284 10 2W Q172 BC546B NPN R46 1k 0 55 W R285 1Q 2W Q173 BC556B PNP R49 100k 0 5 W R291 1k 0 5 W8 Q174 BC546B NPN R51 2k2105W R292 2202 0 5 W Q175 BC556B PNP R52 4k7 10 5 W R293 10k 0 5 W Q176 BC546B NPN R53 not used R294 100k 0 5 W Q177 BC546B NPN R54 1k 0 5 W R304 5k6 0 5 W Q180 BD242C PNP R55 4k7 10 5 W R306 0 5 W Q181 BD241C NPN R60 4k7 0 5 W R314 12k 0 5 W Q182 TIP122 NPN R61 100k 0 5 W R316 4k 10 5 W Q183 TIP127 PNP R62 47k 10 5 W R323 1k 0 5 W8 Q184 TIP122 NPN R63 10k 0 5 W R328 1k 0 5 W8 Q185 TIP127 PNP R64 10k 0 5W R333 1k 0 5 W8 Q186 TIP122 NPN R65 10k 0 5W R338 1k 0 5 W8 Q187 TIP127 PNP R114 56k 0 5 W R341 6 8 0 5 W Q190 TIP122 NPN R116 56 0 5 W R342 22k 10 5 W Q271 BC556B PNP R123 8k2 0 5 W R346 22k 0 5 W Q272 BC546B NPN R128 8k2 0 5 W R347 0 247 2 W Q273 BC556B PNP R141 3k9 0 5 W R349 0 5 W Q274 BC546B NPN R142 22k 0 5
22. Measurement instruments have some finite time constant or response time they cannot instantaneously follow a rapidly changing signal ampli tude If the measurement instrument has frequency selectivity spectrum analyzer or tracking filter the response time is even slower due to the en ergy storage or ringing effect of the tuned filter When the stimulus signal is swept rapidly the measurement instrument simply cannot follow the more rapid extreme variations and the displayed result is smoothed peaks are reduced and dips are filled in 4 6 3 MLS Technology for Frequency Response Measurements Date printed 29 02 00 Loudspeaker frequency response measurement under free space conditions without requiring an anechoic room is an important application of Maxi mum Length Sequence MLS test systems such as Audio Precision System One DSP or System One Dual Domain both using the MLS TST program or MLSSA a PC based audio test system Nevertheless the setup dimensions given in sections 4 3 2 2 4 4 2 2 and 4 5 2 2 must be strictly followed MLS testing permits time selective measurements in which one signal such as the direct sound from a loudspeaker may be separated from another similar signal such as a room reflection The time window may be adjusted to allow measurement of any arrival in a complex reverberation pattern These signals may be examined in the time domain showing energy as a function of time or in th
23. Measurement microphone Briel amp Kj r BK4133 preamp BK2639 or equivalent M2 Measurement amplifier Br el Kj r BK2610 or equivalent Level THD phase analyzer AudioPrecision System One or equivalent P1 Phase meter with adjustable propagation delay compensation on reference input 4 5 2 2 A5 Initial Settings Set the level potentiometer to CAL position fully counterclockwise Set the roll off potentiometer to CAL position fully counterclockwise Set power switch to ON 4 5 2 3 A5 Insulation Check e Connect the HV generator to the mains input connector according to the diagram below Apply 1 8 kV for 5 seconds e The leakage current must not exceed 5 mA E4 32 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 5 2 4 A5 Measurement Setup in the Anechoic Room e Setup the loudspeaker e Setup the measurement microphone A Distance to the baffle 1 m Kquidistant from the two vertical edges Equidistant from the centers of mid range and tweeter units 1 e h 45 cm and Perpendicular to the baffle e Connect your unit to the mains set power switch to ON check the current consumption lt 95 for 230 Connect generator Gl with correct signal polarity Note For more information on frequency response measurements please refer to section 4 6 Date printed 29 02 00 Service E4 33 A Series Active Monitor Speaker
24. SECTION 5 STUDER A5 Parts List A Series Active Monitor Speakers Ref C0 C2 C3 nA wt 0 06 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 mon ULU C21 C22 C24 C32 C33 C38 C41 045 C51 C52 C113 C118 C124 C126 C140 C142 C146 C149 C180 C181 C190 C191 C203 C208 C214 C216 C240 C242 C246 C249 C280 C281 C290 C291 C303 C308 C313 C318 C324 C326 C334 C336 C340 C342 C346 C349 C380 C381 C390 C391 Value not used Polyester 7 5 mm 220 nF 100V Electrolytic radial 3300 UF 50V T ICMI Clectiolytic radial 3999 HU JUV Electrolytic radial 3300 UF 50V Electrolytic radial 3300 50V Electrolytic radial 3300 uF 50V Electrolytic radial 3300 uF 50V Electrolytic radial 3300 uF 50V Electrolytic radial 3300 UF 50V Electrolytic radial 22 uF 63V Polyester 7 5 mm 220 nF 100V Polyester 7 5 mm 220 nF 100V Polyester 7 5 mm 100 nF 100V Polyester 7 5 mm 100 nF 100V Polyester 7 5 mm 100 nF 100V Polyester 7 5 mm 100 nF 100V Polyester 7 5 mm 1 nF 630V Polyester 7 5 mm 1 nF 630V Polyester 7 5 mm 1 nF 630V not used Ceramic 220 pF Electrolytic radial 22 uF 63V Polyester 7 5 mm 220 nF 100V Electrolytic radial 22 uF 63V Electrolytic radial 470 uF 25V Electrolytic radial 22 IF 63V b c Ceramic 220 pF Polyester 7 5
25. Supply Voltages Stes Measurement Description Id Type Value Limits Supply check Date printed 29 02 00 Service E4 3 STUDER A Series Active Monitor Speakers 4 3 1 5 A1 Input Gain Check and EQ Preadjustments These preadjustments must be performed only if RTI and RT2 are com pletely out of range these settings will be fine adjusted on the assembled unit also refer to section 4 3 2 5 Generator Measurement Stes No Description Id Testpos Type Value Limits 33 dBV 200 Hz sine wave RT1 adjust 33 dBV 12 2 kHz sine wave 18 2dBV 4054 RT2 adjust 33 dBV 21 kHz sine wave 17 0dBV 0 5 dB Repeat steps 2 and 3 until all values are within the given limits 20 dBV E4 4 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 3 1 6 A1 Input Common Mode Rejection Ratio CMRR Connect the generator in common mode to the input i e hot generator output to both input terminals no 2 and cold generator output to input terminal no 1 GND Generator Measurement Description Id Value Type Value Limits 0 dBV 50 Hz sine wave Mi Level 42dWV 2 CMRR1kHz 01 j0dB
26. W R370 220k 0 5 W Q275 BC556B PNP R145 1k 0 5 W R371 1k 05W Q276 BC546B NPN R146 12k 0 5 W R372 1k 0 5 W Q277 BC546B NPN R147 0047 20 R373 47910 50 Q280 BD242C PNP R148 004712W R374 47Q 0 5W Q281 BD241C NPN R149 3k3 0 5 W R375 47Q 0 5W Q282 TIP122 NPN R170 220k 0 5 W R376 470 0 5 Q283 TIP127 PNP R171 1k 0 5 W R377 3300 0 5 W Q284 TIP122 NPN R172 1k 0 5 W R378 330 2 0 5 W Q285 TIP127 PNP R173 4 2 0 5 W R379 22k 0 5 W Q290 TIP122 NPN R174 472 05 W R380 1000 0 5 R175 479 10 51 R381 1002 0 5 W Q371 BC556B PNP R176 470 0 5 R382 1Q 2W Q372 BC546B NPN R177 3300 0 5 W R383 10 2W Q373 BC556B PNP R178 3300 0 5 W R391 3300 0 5 W Q374 BC546B NPN R179 22k 0 5 W R392 1000 0 5 W Q375 BC556B PNP R180 1000 0 5 W R393 10k 0 5 W Q376 BC546B NPN R181 1000 0 5 W R394 100k 0 5 W Q377 BC546B NPN R182 10 2W Q380 BD242C PNP R183 10 24 4 7 10 5 W Q381 BD241C NPN R184 12 2W RA2 4k7 0 5W Q382 TIP122 NPN R185 12 2W RA4 4k7 10 5 W Q383 TIP127 PNP R186 10 2W 3k9 0 5 W Q390 TIP122 NPN R187 1Q 2W RA ok6 0 5 W R191 10k 0 5 W RA8 4k7 0 5W STUDER A Series Active Monitor Speakers A5 Parts List Value Ref Value RB1 4k7 10 5 W RL1 4k7 05W RB2 4k7 0 5W RL2 4k7 0 5W RR4 12k 05 W RL4 8k2 0 5 W RB6 5k6 0 5 W RL6 2k2 0 5 W RB7 5k6 0 5W RL7 15k 0 5 W RB8 5 6 0 5 W RL8 3k9 0 5 W RC1 4k7 0 5 W RM1 4k7 10 55 W RC2 4k7 0 5
27. only the anechoic portion first arrival or a longer portion of the signal for accurate bass response With MLS one ac quisition and correlation produces an impulse response which may then be evaluated over and over to look at anechoic response response of any se lected reflection integrated room response etc The TDS technique requires that the generator to bandpass filter frequency offset delay time be reset to equal the acoustical propagation delay for each acoustical path to be meas ured Sweep speed is critical for the TDS technique and an operator may easily select a speed which produces erroneous data without knowing he is making an error Ambient acoustic noise tends to be greatest at low frequen cies due to heating and air conditioning systems traffic noise etc To im prove signal to noise ratios under these typical conditions MLS testing is normally used with pink spectral shaping high frequency attenuation of the generated pseudo random noise A complementary filter in the analysis pro cess produces overall flat response To accomplish the equivalent function in the TDS technique would require logarithmic sweeps and a variable bandwidth filter which is more complex and not done in available TDS instruments Additionally pink noise is similar in spectral distribution to voice and music so the heating effect on individual loudspeakers of a multi way loudspeaker system with pink MLS noise is similar to that which occurs dur
28. position fully counterclockwise Set power switch to ON 4 4 2 3 A3 Insulation Check e Connect the HV generator to the mains input connector according to the diagram below Apply 1 8 for 5 seconds The leakage current must not exceed 5 mA E4 20 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 4 2 4 A3 Measurement Setup in the Anechoic Room e Setup the loudspeaker e Setup the measurement microphone A Distance to the baffle 1 m Kquidistant from the two vertical edges Equidistant from the centers of woofer and tweeter units 1 e h 23 cm and Perpendicular to the baffle Connect your unit to the mains set power switch to ON check the current consumption lt 60 for 230 Connect generator G1 with correct signal polarity Note For more information on frequency response measurements please refer to section 4 6 Date printed 29 02 00 Service E4 21 A Series Active Monitor Speakers STUDER 4 4 2 5 A3 SPL and EQ Fine Adjustment Set balanced generator to 255 mVRMS i e 11 8 dBV or 9 7 dBu e Plot frequency response sweep m tolerance according to the graph below EQ fine adjustment possibilities Overall tweeter level 2 2 20 kHz with trimmer potentiometer RT300 Tweeter level 6 0 kHz with trimmer potentiometer Tweeter level 9 0 kHz with trimmer potentiometer RT2 Tweeter level 12
29. source The distance from the point of origin of the sound to the speaker surface varies because the individual speaker systems have different mounting depth With wide band signals this normally leads to dispersion 1 6 the in dividual frequency components arrive at the listening position at different times In the Studer A series active speakers these differences in the transit time of the audio signals are compensated by analog delay circuits maintaining the necessary delay up to frequencies above the audio range Time delay compensation negative output impedance of the power amplifi ers and a sophisticated crossover design offering steep filter characteristics and phase linearity all together leads to the excellent impulse behavior of the A series and to their greatly improved reproduction of transient music signals A unique feature of the A Series studio monitors is that different speaker types can be mixed for setting up a surround system The simple reason for this is the group delay compensation Usually combining different speaker types with uncompensated group delay can cause quite unpleasant phase domain effects resulting in sound sources being placed in wrong positions Parts of a signal panned to the right side could then be localized behind the listener or in other undesired positions The different A Series studio monitors feature identical phase response over the whole frequency spectrum and therefore give an accurate
30. voltage selector setting matches your local line voltage The voltage selector is contained within the fuse holder its setting can be changed only while the power is switched off To change the setting first pull out the black fuse holder cover then pull out the grey fuse holder In sert it into the fuse holder cover again after having rotated it by 180 de grees Check for correct setting before plugging in the fuse holder cover The set voltage value is indicated in the small window in the fuse holder The primary fuse must be replaced by a spare fuse of exactly the same type and value Power on off switch Potentiometer for matching the input sensitivity to your standard line level For the Al this control is located on the front panel Continuously adjustable bass cut filter allows attenuation of the low fre quencies in order to compensate for boundary reflections when the unit 15 mounted close to one approx 3 dB setting fig 1 to two approx 6 dB setting fig 2 or to three room boundaries approx 10 dB setting fig 31 NP Operation E3 3 A Series Active Monitor Speakers STUDER 6 INPUT Transformer balanced A5 and or electronically balanced 1 audio input on female 3 pin XLR connector Pin assignment Polarity positive voltage on pin 2 causes a positive diaphragm deflection 1 the woofer s diaphragm moves towards the listener N
31. 0 0 5 W 1000 0 5 W 1Q 2W 1Q 2W 10 2 10 2 10k 0 5 W 10k 0 5 W 1k 0 5 W2 10k 0 5 W 100k 0 5 W 10k 0 5 W 10k 0 5 SECTION 5 A Series Active Monitor Speakers A3 Parts List SECTION 5 Value 10k 0 5 W 18k 0 5 W 10k 0 5 W 56K 0 5 W 2 7 0 5 W 1k 0 5 5 1k 0 5 5 10k 0 5 W 10k 0 5 W 882 0 5 W 5 6 0 5 W not used 8k2 05W 22k 10 5 W 10k 0 5 W 06247 2 W 1k 0 5 W5 220k 0 5 W 1k 05W 1k 05W 4 62 05 W 47Q 0 5W AFD 10 BAA 51 224 VU Vy 47 210 5 W 33060 0 5 W 3300 0 5 W 22k 0 5 W 1000 0 5 W 1000 0 5 W 1Q 2W 1Q 2W 10k 0 5 W 2200 0 5 W 1000 0 5 W 10k 0 5 W 100k 0 5 W 470k 0 5 W 6 8 0 5 W 6K8 0 5 W 15k 0 5 W 4k 10 5 W 12k 0 5 W 882 0 5 W 100k 0 5 W 220k 0 5 W 6 8 0 5 W 6 8 0 5 W 10k 0 5 W 4k7 0 5 W 6K8 0 5 W 4k7 05W not used 150k 0 5 W 6 8 0 5 W 6K8 0 5 W 15k 0 5 W 47 0 5 W 10k 0 5 W 10k 0 5 W 33k 0 5 W 220k 0 5 W 6 8 0 5 W 6 8 0 5 W 10k 0 5 W 4k7 0 5 W 6 8 0 5 W 9 6 0 5 W ATKk 10 5 W Value 220k 0 5 W 6K8 0 5 W 6K8 0 5 W 10k 0 5 W 9 6 0 5 W 6 8 0 5 W 5 6 0 5 W 4 k 0 5 W 150k 0 5 W 6 8 0 5 W 6K8 0 5 W 15 0 5 W 9k6 0 5 W 10k 0 5 W 10k 0 5 W 33k 0 5 W Potentiometer 10k horizontal PCB mount Potentiometer 10k horizontal PCB mount Trimmer potentiometer 2
32. 0 5 W 960 2 2W 56060 2 W 4700 0 5 W 4700 0 5 W 4 7 0 5 W 47k 0 5 W 100k 0 5 W 47k 0 5 W 100k 0 5 W 470k 0 5 W 470k 0 5 W 3300 0 5 W 47k 0 5 W 47k 0 5 47k 10 5 W 1000 0 5 W 10002 0 5 W 6800 0 5 W 100k 0 5 W 1k8 0 5 W 10k 0 5 Bridge 8k2 0 5 W 47k 0 5 W 3 3 0 5 W 9k6 0 5 W 33k 0 5 W 15k 0 5 W 68k 0 5 W 18k 0 5 W 1k 0 5 W 33k 0 5 W 0047 21 1k 0 5 W 1k 0 5 W 1k 0 5 W 10k 0 5W 10 0 5 1k 0 5 W 1k 0 5 W 47Q 0 5W 472 0 5W Ref R182 R183 R190 R191 R192 R193 R194 RIA R206 R241 R242 R246 R247 R249 R270 R271 R272 R273 R274 R275 R280 904 R282 R283 R290 R291 R292 R293 R294 RAO RA RA2 RA4 RAS RA6 RA RA8 RBO RB1 RB2 RB4 5 RB6 RB RB8 RED1 RED2 RED3 2 RT1 RT2 RT190 RT200 RT290 U1 U2 U3 U4 UD1 Value 10 24 Q 2W 10k 0 5 W 33k 0 5 W 8k2 0 5 W 22k 0 5 W 220k 0 5 W RW WING V V 12k 0 5 W 10k 0 5 W 68k 0 5 W Not used Wire bridge 0 8 x 50 mm 2 2 0 5 W 1k 05W 1k 05W 10k 0 5 W 10k 0 5 1k 0 5 W 1k 05W 47Q 0 5W 47Q 0 5W 1Q 2W 1Q 2W 10k 0 5 W 1500 0 5 W 1000 0 5 W 10k 0 5 W 100k 0 5 W 220k 0 5 W 6k8 0 5 W 6k8 0 5 W 12k 0 5 W 5k6 0 5 W 6k8 0 5 W 9 6 0 5 W 4fk 1 0 5 W 150k 0 5 W 6k8 0 5 W 6k8 0 5 W 15k 0 5 W 9 6 0 5 W 8 2 0 5 W 8k2 0 5 W
33. 14 RJ1 RLL RU4 RL4 h b p s CJ8 CL8 R34 S 5 R213 RJ8 TJG RL8 R33 27 R218 Ud CL SUE RJ RLT R276 ae T R274 m RJ6 RL6 5 RT290 Bc BEC dE 35 C12 CI5 c lt CK5 E RIL RK1 p 5219 5204 q 0281 n RI4 RK4 q R281 7 8 8 R42 e gt RI amp RK8 543 00 0279 C208 CIG CKG 2 RZE I 2 pok RIT 843 R271 5249 AT CIT CK s HPA R45 we x R393 D392 J er R34 R39 D391 C38 R392 R394 3 R38 R39 HPM 4 L R D292 403 702 Jol R247 238 us RT4 RT2 KN 02311 R147 R292 R294 HPB R193 D192 d R192 RI94 C142 2 RT3 FE RT1 a tra CH4 R184 CH8 CF8 R51 RF8 R65 CHE CF6 E R172 SES R65 CH7 CF7 eal ARISE RF6 a R180 RE2 2 CGS 7 RT52 C180 1 5 RE4 CG8 CE8 R54 RE8 52 S C66 CE6 HS Em 7 RES ut D eni R52 Ri R181 oO 481989 UD2 UD3 UD4 2 02 8111 85 kp CDS R64 ae RD1 CB4 CD4 RD4 R62 R185 CBS CDS EET CBE CD6 RD R3 CB CD O R4 RC2 LE Co CAS CCS oO RC1 R187 CA4 CC4 RC4 2 Qc CC RC8 CAG CCE gt RC RCG 2 mains transformers VARIAC Date printed 29 0
34. 170 FET BC556B PNP BC546B NPN BC556B PNP BC546B NPN BC556B PNP BC546B NPN BC546B NPN BD242C PNP BD241C NPN 122 NPN TIP127 PNP TIP122 NPN TIP127 PNP TIP122 NPN BC556B PNP BC546B NPN 5568 PNP BC546B NPN BC556B PNP BC546B NPN BC546B NPN BD242C PNP BD241C NPN TIP122 NPN TIP127 PNP TIP122 NPN Ref R1 R2 R3 R4 R5 R7 R11 R12 R21 R22 R23 R24 R33 R34 R36 R38 R39 R40 R41 R42 R43 R44 R45 R46 R49 R51 R52 R53 R54 R55 R60 R61 R62 R63 R64 R65 R204 R206 R213 R217 R218 R241 R242 R243 R245 R246 R247 248 249 R2 0 R2 1 R272 R273 R274 R275 R2 6 R277 R278 R279 R280 R281 R282 R283 R284 R285 R290 R291 R292 R293 R294 R301 R302 Value 10k 0 5 W 10k 0 5 W 100k 0 5 W 30k 0 5 W 100k 0 5 W 5k6 0 5 W 5600 2 W 5600 2 W 1k 0 5 W 1k 05 W 1k 0 5 W 1k 0 5 W 4k7 0 5 W 4k7 0 5 W 2k2 05W not used 10k 0 5 W 2200 0 5 W 33k 0 5 W 33k 0 5 W 33k 0 5 W 47910 50 47Q 0 5W 1k 0 5 W 100k 0 5 W 2k2 0 5 W 4k7 05W not used 1k 0 5 W 4k7 0 5W 4k7 0 5W 220k 0 5 W 47k 0 5W 10k 0 5 W 10k 0 5 W 10k 0 5 W 82k 0 5 W 3k3 0 5 W 15k 0 5W 22k 10 5 W 2k2 0 5 W 4k7 0 5W 18k 0 5 W 15k 0 5 W 1k 0 5W 1k 0 5 W2 0947 12 W 0047 2 W 1k 0 5 W5 220k 0 5 W 1k 0 5 W 1k 0 5 W 4 0 5 W 4 62 05 W 470 0 5 W 47Q 0 5W 3300 0 5 W 330Q 0 5 W 22k 0 5 W 100
35. 2 0 5 W TRA3 Line Input transformer Studer 426 00 RI7 8k2 0 5W 8 8k2 0 5 Ut TLO72CP dual opamp 4k7 0 5W U2 TLO72CP dual opamp RJ2 4k 0 5 W U3 TL072CP dual opamp RJ4 8 2 0 5 W U4 TLO72CP dual opamp RJ6 2k2 0 5W US TLO72CP dual opamp RJ7 15k 0 5 W U6 TLO72CP dual opamp RJ8 3k9 0 5 W UD1 TLO 2CP dual opamp RK1 not used UD2 TLO72CP dual opamp RK2 not used UD3 TLO72CP dual opamp RK4 not used UD4 TLO72CP dual opamp RK6 not used UD5 TLO72CP dual opamp 7 not used UD6 TLO72CP dual opamp RK8 not used UD7 not used UD8 TLO72CP dual opamp SECTION 5
36. 2 00 STUDER A Series Active Monitor Speakers 4 5 1 A5 Settings on the PCB 4 5 1 1 A5 Required Test Tools T1 Variable mains transformer variac Al True RMS AC ammeter V1 VI True RMS voltmeter V2 V5 Digital DC voltmeter G1 Sine wave generator with balanced output min 20 Hz 20 kHz lt 0 02 THD Mw Mt Voltmeter THD meter phase meter RLw RLm RLt Dummy load resistors 10 Q approx 10 W Rdt Fixed resistor 22 for overheat protection check Note MI Mw Mt can be replaced by a universal audio test system Audio Precision System One or equivalent 4 5 1 2 A5 Initial Settings Note Replacement backpanel assemblies or amplifier units come factory pre adjusted Adjustment of the quiescent current is therefore not necessary after replacement checking is recommended nevertheless Unplug the speaker cables from the PCB do not connect any load to the amplifier outputs Make sure that none of the cable ends contacts the PCB Set the level potentiometer to CAL position fully counterclockwise Set the roll off potentiometer to CAL position fully counterclockwise Set trimmer potentiometers RT190 RT290 and RT390 quiescent current to min position fully counterclockwise e Varlac set to min 0 Vac Power switch to ON position 4 5 1 3 A5 Powering Up e Visually check the PCB and the solder joints and repair if necessary e Check the mains voltage 230 Vac 115
37. 20 pF Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF 63 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Electrolytic radia 22 UF 63 V E Le ILE Vu CAMIGAT 6 Not used Ceramic 100 pF Not used Ceramic 220 pF Ceramic 220 pF Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF V Ceramic 100 pF Polyester 7 5 mm 22 nF 630 V Polyester 7 5 mm 22 nF 630 V Ceramic 100 pF Polyester 7 5 mm 1 nF 630 V Polyester 7 5mm 1 nF 630 V 1N4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery BZT03C Z 18 V BZTO3C Z 18V Flat pin 2 8 mm Flat pin 2 8 mm Flat pin 2 8 mm LED grn 30 cm wire Flat pin 4 8 mm Flat pin 4 8 mm Flat pin 4 8 mm Ref Q1 Q2 Q40 Q170 Q171 Q180 Q181 1182 X 196 0183 0190 0270 Q271 2280 1281 1282 Q283 Q290 R1 R2 R7 DAA nii R12 R18 R19 R20 R21 R22 R23 R24 R28 R29 R40 R41 R42 R43 R44 R45 R46 R49 R51 R52 R53 R55 R104 R106 R113 R118 R141 R142 R143 R145 R146 R147 R149 R1 0 R171 R172 R173 R174 R175 R180 R181 SECTION 5 Value BD242C PNP BD241C NPN BS170 FET BC546B NPN BC556B PNP BD242C PNP BD241C NPN 129 14 4 UN iN TIP127 PNP TIP122 NPN BC546B NPN BC556B PNP BD242C PNP BD241C NPN TIP122 NPN TIP127 PNP TIP122 NPN 10k 0 5 W 10k 0 5 W 5k6
38. 258 121 00 15 258 121 00 2 pcs used Power amplifier preadjusted 15 258 222 00 258 122 00 pcc 258 052 00 Mounting bracket 15 258 223 00 Enclosure body empty 15 258 229 00 lt aa s Woofer protection grille mounting kit 15 258 211 00 Important note Date printed 29 02 00 When ordering a complete backpanel amplifier assembly or a power am plifier unit it is mandatory to declare the speaker type and serial number as indicated on the speaker s backpanel Only if these conditions are met the manufacturer can ensure that the desired spare part is shipped with cor rect pre alignments Service E4 1 A Series Active Monitor Speakers 4 3 A1 Service Measurement setup diagram E4 2 Service STUDER
39. 5 1 8 A5 Woofer Amplifier Output Connect only the dummy load 10 Q Measurement Description Id Type Value Limits Woofer output level 20 6 dBV 100 Hz sine wave 3 5dBV 0 25 dB Woofer output THD 20 6 dBV 100 Hz sine wave THD N Woofer output 20 dBV 0 2 0 1 0 05 0 02 0 01 E4 28 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 5 1 9 A5 Mid range Amplifier Output Connect only the RLm dummy load 10 0 Stes Measuement Description Id Value Type Value Limits No Mid range output 10 N Anlr L vel 0 Lum NS _ 100 50 10 i _ 20 20 _ 10 ES 5 amp 30 59 2 40 05 50 N 0 2 60 _ 0 1 THD N Ratio 0 05 70 E mE 80 0 01 20 50 100 200 500 1k 2k 5k 10 k 20 k Date printed 29 02 00 Service E4 29 A Series Active Monitor Speakers STUDER 4 5 1 10 5 Tweeter Amplifier Output Connect only the dummy load 10 0 Measurement Description Id Type Value Limits Tweeter output level 15 6 dBV 8 8 kHz
40. 5 kHz with trimmer potentiometer RT3 Tweeter level 20 0 kHz with trimmer potentiometer RT4 Note pase setting of RTI through RT4 refer to section 4 4 1 5 4 4 2 6 A3 Distortion Check Set balanced generator to 255 mVRMS i e 11 8 dBV or 9 7 dBu e Plot a 20 Hz 20 kHz THD sweep 1 m lt 1 2 48 Hz 20 kHz 20 50 100 200 500 1k 2k 5k 10 k 20 k Hz E4 22 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 4 2 7 A3 Polarity Check e Place the measurement microphone at a distance of 10 cm from the baffle and exactly in the center of the woofer Description Id 7 Type Value Limits System polarity 14 dBV 255 mVaus 120 wave Phase 0 320 Note Without compensation the microphone Br el amp Kjaer BK4133 2639 is inverting 4 4 2 8 A3 Overall Phase Check e Place the measurement microphone again on axis according to 4 4 2 4 distance 0 806 m Set the phasemeter propagation delay time to 2 91 ms corresponding to a distance of 1 m Set balanced generator to 255 mVRMS i e 11 8 dBV or 9 7 dBu e Plot a phase sw
41. 7 CF8 CG2 CG4 CG5 CG6 CG8 CH2 CH4 CHS CH6 CH8 12 CIS 16 CI8 CJ2 CJ4 CJ5 CJ6 CJ8 Value Ceramic 100 pF not used Palyester 7 5 mm 10 nF 250 V 4C 250 V Da ntar 7 R men 1 olyester T NIB Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 10 nF 250 V Ceramic 100 pF not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF not used Polyester 7 5mm 2 2 nF 630 V 75m 7 4E 1 Polyester 4 nr V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Ceramic 100 pF not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF not used Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Ceramic 100 pF not used Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Ceramic 100 pF not used Polyester 7 5 1 nF 630 V Polyester 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF not used Polyester 5 mm 1 nF 630 V Polyester 7 5 mm
42. CB1 CR1 RB4 RA4 2 22 RR2 RB1 O RAL LLI AQ C RBO RAO A CS RB RAT RBB RAB o CO m lt RB6 RAG RBS RAS E Le RT2 R391 0391 R392 R394 RT1 R293 0292 R291 D291 R292 R294 Mains transformer VARIAC h Date printed 29 02 00 1 Service E4 13 A Series Active Monitor Speakers STUDER 4 4 1 A3 Settings on the PCB 4 4 1 1 A3 Required Test Tools T1 Variable mains transformer variac Al True RMS AC ammeter V True RMS AC voltmeter V2 V5 Digital DC voltmeter G1 Sine wave generator with balanced output min 20 Hz 20 kHz lt 0 02 THD Voltmeter THD meter phase meter RLw RLt Dummy load resistors 10 Q approx 10 W Rdt Fixed resistor 22 for overheat protection check Note MI Mw Mt can be replaced by a universal audio test system Audio Precision System One or equivalent 4 4 1 2 A3 Initial Settings Note Replacement backpanel assemblies or amplifier units come factory pre adjusted Adjustment of the quiescent current is therefore not necessary after replacement checking is recommended nevertheless Unplug the speaker cables from the PCB do not connect any load to the amplifier outputs Make sure that none of the cable ends contacts the PCB Set the level potentiometer to CAL position fully counterclockwise Set the roll off potentiometer to CA
43. EA 7 VAI 6 552522 54 EA 8 4 3 2 Aa Checks on the assembled 255281 4 9 ao nh 2115 001 absenden etaed actutum cot loeis eta on 4 9 4022 GND Wi 5 222220 4 9 42 9 a ee 4 9 4 3 2 4 Measurement Setup in the Anechoic Room 4 10 43 29 Ak SPD and EO cubat e uad nct Gs EA 11 Spr MENSEM BI reu CNE d T EA 11 22 22 18 CMCC Wet P EA 12 d AMCOvVerall Pliase Check ido bps EA 12 Date printed 29 02 00 Contents 0 1 A Series Active Monitor Speakers STUDER D MEME S EA 13 4 4 1 PS RR EA 14 81210018 Ep eae M M MU E RU EA 14 202 Ini ESO n EA 14 A Nd S masu nu EA 14 2 4 1 4 NV OLA CCS 2555 a e iesu putate veta EA 14 441 5 Input Gain Che
44. ITION OF LEVEL CONTROL CAL ROLL OFF 10 CAL dB LEVEL CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR ACHTUNG GEFAHR ELEKTRISCHER SCHLAG NICHT OFFNEN DO NOT COVER REAR PANEL NE PAS COUVRIR L ARRIERE 115 230 V 50 60 Hz 100 VA 230V TOSAL REPLACE WITH SANE TYPE FUSE slow REMPLACER PARUNFUSELE DE TYPE INPUT 1 CHASSIS 2 INPHASE 3z OP PHASE SENS 775 mV z 100 dB CAL POSITION OF LEVEL CONTROL CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR ACHTUNG GEFAHR ELEKTRISCHER SCHLAG NICHT OFFNEN DO NOT COVER REAR PANEL NE PAS COUVRIR L ARRIERE 115 230 V 50 60 Hz 80 VA MAINS VOLTAGE SELECTOR p 230V TO5AL REPLACE WTHSAME TYPE FUSE REMPLACER PARUN FUSIBLE DE IVEIVE TYPE 6 3 2 1 STUDER Date printed 29 02 00 STUDER 1 IEC mains connector 2 Mains fuse voltage selector 3 POWER 4 LEVEL Note 5 ROLL OFF A3 and AS only Date printed 29 02 00 A Series Active Monitor Speakers Appliance inlet IEC 320 C14 for connection to a 3 pole AC power outlet with protective ground Supply voltage selectable 115 or 230 frequency 50 60 Hz For connecting to the mains please consult the Safety section at the very beginning of this manual Make sure that the
45. L B UD2A BL B UD3A BL C UDAA BL I UD5A BL J UD6A BL K UD7A NOT USED BL L UD8A RX1 RX2 UD B BL E UD4B BL F UD3B BL G UD2B BL H UD1B BL M UD8B BL N UD7B USED CY8 BL O UD6B BL P UD5B SECTION 5 STUDER A Series Active Monitor Speakers A5 HF AMP 3 t de 8 C390 R380 R381 ON and V OFF V e P 5 i E SECTION 5 STUDER A Series Active Monitor Speakers A5 MF AMP 05618 2820 SECTION 5 STUDER A Series Active Monitor Speakers A5 LF AMP 0184 0185 e a a R182 R183 R170 V ON and V OFF Standby gt IN 2 SECTION 5 STUDER A Series Active Monitor Speakers A5 Layout TRAF 3 UD8 E m ae Leer rne UD pw Poo fw 9 z eo PR oijojo RI RIG ns 0986 PE RO ROG UDS Jt Ie RJS RJ R12 24 RII 6 om LO 2820 6981 R282 C12
46. L position fully counterclockwise Set trimmer potentiometers RT290 and RT390 quiescent current to min position fully counterclockwise e set to min 0 Vac Power switch to ON position 4 4 1 3 A3 Powering Up e Visually check the PCB and the solder and repair if HE TE e Check the mains voltage 230 29V 115 e Check or insert the primary fuse T08AL250V T1 6AL 250 V Connect the generator according to the diagram Slowly increase the variac output while checking the primary current lt 50 mAac lt 100 mAac The green Power LED illuminates Increase the variac output until V1 is 64 Vac 4 4 1 4 A3 Supply Voltages Stes Measurement Description Id Testpos Type Value Limits Supply check e MVe 2 Supplycheck 01 9 MV E4 14 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 4 1 5 A3 Input Gain Check and EQ Preadjustments These preadjustments must be performed only if RTI through RT4 are completely out of range these settings will be fine adjusted on the assem bled unit also refer to section 4 4 2 5 Stes Measurement Description Id Type Value Limits e tee ane tase wave ML 190 10808 _ 7 Repeat steps 3
47. STRUCTIONS 4 1 General Important 4 2 Spare Parts Repair work may only be performed by a trained service technician The primary fuse must be replaced by a spare fuse of exactly the same type and rating The unit must not be opened by the user risk of a severe electrical shock hazard During servicing never short any two terminals The settings of an assembled and aligned unit may slightly differ from the ones of the aligned PCB If acoustical measurements are performed with an MLS system insatisfac tory results will be obtained unless obstacles are at a distance larger than the current wavelength For more information on frequency response meas urements please refer to the Appendix section 4 6 In case of incorrect manipulation and or adjustment the manufacturer can not be made liable for failure or insatisfactory results Order no m 0 0 m J _ 5 x 20 mm T 0 5 A L 250 V T 0 8 A L 250 V T 1 6 A L 250 V 5 x 20 mm T 1 0A L 250 V T 1 6 A L 250 V T 3 15 A L 250 V 5 x 20 mm 1 0 slow blow UL CSA 1 6A slow blow UL CSA 3 2A slow blow UL CSA Rao _ _ 15 258 010 00 Mid range unit 15 258 020 00 XA lt a 0 15 258 040 00 Complete backpanel heat sink assembly 15 258 230 00 15 258 130 00 15 258 030 00 including power supply and amplifiers Backpanel only silk screened Mains transformer 15 258 220 00 15 258 120 00 15 258 050 00 15 258 221 00 15
48. V kHzsnewave M level lt 4208 3 CMRR OkHz 01 OdBV 10kHz sinewave M ee 26dBV Common mode rejection 0 10 20 30 40 60 1 90 100 200 900 1k 2k 5k 10 k 20 k dBV 80 90 100 20 Hz 4 3 1 7 A1 Quiescent Current Setting Procedure 1 Measure the primary current Al 30 40 for 230 V or 60 80 for 115 V and note the measured value 2 Adjust RT290 turn carefully clockwise for a reading of Al Al 3 mA c for 230 V or Al 6 mA c for 115 V and note the measured value 3 Adjust RT190 turn carefully clockwise for a reading of Al Al 3 for 230 V or Al 6 mA c for 115 V and note the measured value 4 Connect both dummy load resistors 10 Q 10 W each and check the pri mary current again Al 0 5 mA c for 230 V or 1 for 115 V Date printed 29 02 00 Service E4 5 A Series Active Monitor Speakers STUDER 4 3 1 8 A1 Woofer Amplifier Output Connect only the RLw dummy load 10 0 Generator No Description ld Value 3 Testpos Type Value Limits Woofer output level 20 dBV 500 Hz sine wave 3 5dBV 0 25 dB Woofer output THD 20 dBV 500 Hz sine wave THD Woofer output 20 Ni
49. Vac e Check or insert the primary fuse T16AL250V T3 15AL250V Connect the generator according to the diagram Slowly increase the variac output while checking the primary current lt 80 mAac lt 160 mAac The green Power LED illuminates e Increase the variac output until V1 and V1 are 64 Vac 4 5 1 4 A5 Supply Voltages Generator Measurement Description Id Value Type Value Limits Supply check Date printed 29 02 00 Service E4 25 STUDER A Series Active Monitor Speakers 4 5 1 5 A5 Input Gain Check and EQ Preadjustments These preadjustments must be performed only if RTI through RT4 are completely out of range these settings will be fine adjusted on the assem bled unit also refer to section 4 5 2 5 Gear Measurement Description 14 Value Type Value Limits 6 RT4 adjust Gf 266dBV 220kHzsinewave 1 Level 198dBV 40 548 Repeat steps 3 through 6 until all values are within the given limits dBr 20 dBV 40 50 100 200 E4 26 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 5 1 6 A5 Input Common Mode Rejection Ratio CMRR Connect the generator in common mode to the input i e
50. W RM2 4k7 10 5 W RC4 8k2 0 5W RM4 8k2 0 5W RC6 3k9 0 5 W RM6 2k2 0 5W 3k9105W RM7 15k 0 5W RC8 3k9 0 5 W RM8 3k9 0 5W RD1 4k7 10 5 W RN1 not used RD2 4k7 0 5W RN2 not used RD4 12k 0 5W RN4 not used RD6 5k6 0 5 W RN6 not used RD 5k6 0 5 W RN7 not used RD8 5k6 0 5 W RN8 not used RET 4 7 0 5 W 4k7 05W RE2 4k7 0 5 W RO2 4k7 0 5 W RE4 12k 0 5 W RO4 8k2 0 5 W RE6 5k6 0 5 W RO6 282 10 5 W RE7 5k6 0 5 W RO 15k 0 5 W RE8 5k6 0 5W RO8 3k9 0 5W RF1 4 7 0 5 W RP1 4k7 10 5 W RF2 4k7 0 5 W RP2 4k7 0 5W RF4 8k2 0 5W RP4 8k2 05W RF6 12k 0 5W RP6 2k2 05W RF7 2k2 0 5W 15k 0 5W RF8 3k9 0 5W RP8 3 9 0 5 W 4k7 0 5 W RP11 Potentiometer 10k horizontal PCB mount RG2 4k7 0 5 W RP12 Potentiometer 10k horizontal PCB mount RG4 12k 0 5 W RG6 not used RT1 Trimmer potentiometer 1k vertical RG 2k7 10 5 W RT2 Trimmer potentiometer 1k vertical RGB 5 6 0 5 W RT3 Trimmer potentiometer 1k vertical RT4 Trimmer potentiometer 1k vertical RH1 4 7 10 5 W RT52 Trimmer potentiometer 10k vertical RH2 4k7 0 5W RT190 Trimmer potentiometer 10k vertical RH4 6k8 0 5 W RT200 Trimmer potentiometer 1k vertical RH6 3k3 0 5 W RT290 Trimmer potentiometer 10k vertical RH 3k3 0 5 W RT300 Trimmer potentiometer 1k vertical RH8 3k3 0 5 W RT390 Trimmer potentiometer 10k vertical RI 4k7 10 5 RED1 Rectifier 80C2300 1500 RI2 4k7 10 5 W RED2 Rectifier B 80C2300 1500 RI4 8 2 0 5 W RI6 8k
51. btained having the advantage of significantly more energy gain in the bass reflex resonance area The transmission range can thus be ex panded toward the low end without overloading the speaker In combination with the negative output impedance it is possible to consider this arrangement strictly as a Helmholtz resonator again being easily com pensated for the bass reflex drawbacks by electronic means Such a combi nation achieves clean bass reproduction down to frequencies amazingly low for the given enclosure size The evaluation of a speaker cannot simply be based on one single point of the room but the entire radiation behavior must be considered The division of the frequency spectrum unfortunately made necessary by various reasons such as Doppler effect partial oscillations of the dia phragms etc creates additional problems If the individual speaker systems are arranged vertically the horizontal ra diation characteristic depends almost exclusively on the quality of the chas sis In the vertical direction however a bundled aggregate signal is ob tained If the partial signals are not in phase with each other either due to different acoustic propagation times or phase rotation in the crossover the radiation lobe changes its direction in the transition zones If the ear is not accurately positioned dips or even peaks in the frequency response can strongly influence the sound impression and the localization of the sound
52. c radial 22 uF 63 V Electrolytic radial 22 uF 63 V Electrolytic radial 22 uF 3 V Polyester 7 5 mm 100 nF 100 V Polyester 7 5 mm 100 nF 100 V Electrolytic radial 22 uF 63 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 1 nF 630 V not used Ceramic 220 pF Electrolytic radial 22 uF 63 V Polyester 5 mm 220 nF 100 V Electrolytic radial 22 uF 63 V Electrolytic radial 470 uF 25 V Electrolytic radial 22 uF 63 V Ceramic 220 pF Polyester 7 5 mm 220 nF 100 V Polyester 7 5 mm 220 nF 100 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 22 nF 250 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Polyester 7 5 mm 47 nF 100 V Electrolytic radial 22 uF 63 V not used Polyester 7 5 mm 1 nF 620 V Polyester 7 5mm 1 nF 620 V Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF 3 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 22 nF 250 V Polyester 7 5 mm 4 7 nF 400 V Polyester 7 5mm 4 7 nF 400 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Electrolytic radial 22 uF 63 V not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF 63 V Ceram
53. can be drastically reduced by improper handling during maintenance and repair work Please observe the following rules when handling ESD sensitive components ESD sensitive components should only be stored and transported in the packing material specifically provided for this purpose When performing a repair by replacing complete assemblies the re moved assembly must be sent back to the supplier in the same packing IV Date printed 17 08 04 STUDEH ESD Repair E Repair material in which the replacement assembly was shipped If this should not be the case any claim for a possible refund will be null and void Unpacked ESD sensitive components should only be handled in ESD protected areas EPA e g area for field service repair or service bench and only be touched by persons who wear a wristlet that is connected to the ground potential of the repair or service bench by a series resistor The equipment to be repaired or serviced as well as all tools aud electri cally semi conducting work storage and floor mats should also be con nected to this ground potential The terminals of ESD sensitive components must not come in uncon trolled contact with electrostatically chargeable voltage puncture or metallic surfaces discharge shock hazard To prevent undefined transient stress of the components and possible damage due to inadmissible voltages or compensation currents electri cal connections should only be established or se
54. ck and EQ 4 15 4 4 1 6 Input Common Mode Rejection Ratio 4 16 24411 Quiescent C UTTENL SEUNG o aenea Qa E 4 16 Z4 lu AS QUO lo Creo 4 17 AMANO AS Tweeter Amphtfier Output ena E Mes on a EA 18 ZI MO sunman ai dotted residet EA 19 GA3SUOVOrheaptProtec HOB 2 4 2 Rese pa dive ue et au t o no PAM DA EA 19 4 4 2 PO CHECKS on the assembled y n 4 20 24 24 Reguired Test TOONS T n smua c 4 20 42 225 JS vam 4 20 2 4 2 3 9 Insulation o b a 4 20 4424 Measurement Setup in the 1 Room 4 21 4412 5 AS SPL and PinesAdjustment oe Eoi aea naan inca aaa 4 22 421266 AS DIStOF On C heck a 4 22 22121 22 1 4 23 Check 4 23 45 3 SOE VICE 5 4
55. clothes from the room These relationships are visible from the following climatogram For a con trolled procedure thermometer and hygrometer as well as a thermometer within the system will be required Example 1 OB van having an internal temperature of 20 C and relative humidity of 40 is switched off in the cvening If tempcrature falls below 5 C dew or ice will be forming Example 22 OB van is heated up in the morning with air of 20 C and a relative humidity of 40 On all parts being cooler than 5 C dew or ice will be forming Humidit absolue da l air is im Absolute air humidity g m sw vu re P t i I 1 o 2 e 2 NO phe m E Eu C EAE ACCU TODA OCEAN a s sS CTY WW TM 30 Humidit relative de l air Relative air humidity 12 80 70 40 1 20 cue de l air jo C Alr temperature Figure B 3 Cilmatogramme pour cat gorie 3K3 721 3 3 1994 Cilmatogram for class 3K3 Date printed 17 08 04 X Appendix STUDER Appendix 2 Mains Connector Strain Relief Procedure For anchoring connectors without a mechanical lock e g IEC mains con nectors we recommend the following arrangement The cable clamp shipped with your unit is auto adhesive For mounting please follow the rules below The
56. components systems equipment that also fulfill the EMC stan dards for the given environment Use a system grounding concept that satisfies the safety requirements class I equipment must be connected with a protective ground conduc Date printed 17 08 04 III Installation Maintenance ESD STUDER tor and that also takes into consideration the EMC requirements When deciding between radial surface or combined grounding the advan tages and disadvantages should be carefully evaluated in each case Use shielded cables where shielding is specified The connection of the shield to the corresponding connector terminal or housing should have a large surface and be corrosion proof Please note that a cable shield connected only single ended can act as a transmitting or receiving an tenna within the corresponding frequency range Avoid ground loops or reduce their adverse effects by keeping the loop surface as small as possible and reduce the noise current flowing through the loop by inserting an additional impedance e g common mode choke Reduce electrostatic discharge ESD of persons by installing an appro priate floor covering e g a carpet with permanent electrostatic fila ments and by keeping the relative humidity above 30 Further meas ures e g conducting floor are usually unnecessary and only suitable if used together with corresponding personal equipment When using equipment with touch sensitive operator contro
57. e Date printed 29 02 00 A Series Active Monitor Speakers STUDER 4 4 1 10 Limiter Threshold e Disconnect all dummy load resistors Stes Measurement Description Id Type Value Limits No LF limiter Red Alarm LED must be on and the Mw and Mt output levels must be reduced Limiter Threshold dBV 4 4 1 11 A3 Overheat Protection Check e Connect 22 according to the diagram in section 4 4 The red Alarm LED must come on The Mw and Mt signals must be muted Date printed 29 02 00 Service E4 19 A Series Active Monitor Speakers STUDER 4 4 2 A3 Checks on the Assembled Unit 4 4 2 1 A3 Required Test Tools C Anechoic room True RMS AC ammeter GHT Hligh voltage generator 1 8 50 Hz max 10 mA G1 Sweep sine wave generator with balanced output AudioPrecision System One or equivalent M1 Measurement microphone Br el amp Kjer BK4133 preamp 2639 or equivalent M2 Measurement amplifier Br el Kj r BK2610 or equivalent Level THD phase analyzer AudioPrecision System One or equivalent P1 Phase meter with adjustable propagation delay compensation on reference input 4 4 2 2 A3 Initial Settings Set the level potentiometer to CAL position fully counterclockwise Set the roll off potentiometer to CAL
58. e frequency domain amplitude and phase vs fre quency Impulse responses may be saved for further analysis A Maximum Length Sequence MLS is a special digital noise signal For typical loudspeaker measurement applications this digital signal is con verted to the analog domain in the D A converter and fed to a power ampli fier which drives the loudspeaker under test A measurement microphone 185 used to pick up the acoustical signal and return it to the analog input The MLS system then performs a cross correlation between the received and transmitted signals to obtain the impulse response which is stored in mem ory The impulse response may be displayed on the computer permitting the user to select the portion of impulse response of interest This portion may be transformed into the frequency domain to study both magnitude and phase response versus frequency These properties are of obvious use when measurement loudspeakers or other electroacoustic devices The time selective capability permits separat ing the device under test response from that of the room in which the meas urements are made Alternately the room itself may be measured studying the reflection characteristics of each surface in the room or of the room taken as a whole Service E4 37 A Series Active Monitor Speakers STUDER 4 6 4 Quasi Anechoic Measurements and Low Frequency Limitations Other techniques exist which provide measurement capability similar to maximu
59. ed Unit 4 3 2 1 A1 Required Test Tools C Anechoic room True RMS AC ammeter GHT Hligh voltage generator 1 8 50 Hz max 10 mA G1 Sweep sine wave generator with balanced output AudioPrecision System One or equivalent M1 Measurement microphone Br el amp Kjer BK4133 preamp 2639 or equivalent M2 Measurement amplifier Br el Kj r BK2610 or equivalent Level THD phase analyzer AudioPrecision System One or equivalent P1 Phase meter with adjustable propagation delay compensation on reference input 4 3 2 2 A1 Initial Settings Set the level potentiometer to CAL position fully counterclockwise Set power switch to ON 4 3 2 3 A1 Insulation Check Connect the HV generator to the mains input connector according to the diagram below Apply 1 8 for 5 seconds The leakage current must not exceed 5 mA Date printed 29 02 00 Service E4 9 A Series Active Monitor Speakers STUDER 4 3 2 4 A1 Measurement Setup in the Anechoic Room e Setup the loudspeaker e Setup the measurement microphone A Distance to the baffle 1 m Kquidistant from the two vertical edges Equidistant from the centers of woofer and tweeter units 1 e h 16 cm and Perpendicular to the baffle e Connect your unit to the mains set power switch to ON check the current consumption lt 50 for 230 Connect generator Gl with correct signal pola
60. eep 20 Hz 20 kHz according to the graph below If the result is above the tolerance increase the microphone distance or if the result is below the tolerance decrease the microphone distance and re peat the phase sweep Phase Date printed 29 02 00 Service E4 23 A Series Active Monitor Speakers 4 5 A5 Service Measurement setup diagram LED POWER V E4 24 Service RLt RLm RLw STUDER
61. ent shall only be assignable to a third party together with the transfer of the system and or its options and after the prior written consent of Studer With the exception of the right of use granted by this License Agreement all proprietary rights to the License Material especially the ownership and the intellectual property rights such as but not limited to patents and copy right remain with Studer even if alterations customized changes or amendments have been made to the License Material Studer s proprietary rights are acknowledged by the Customer The Cus tomer shall undertake no infringements and make no claims of any patent registered design copyright trade mark or trade name or other intellectual property right For all issues not covered herewithin please refer to the General Terms and Conditions of Sale and Delivery that are part of the sales contract Date printed 17 08 04 STUDER A Series Active Monitor Speakers CONTENTS 1 WeIlegniela gua Y9 1 1 aaa Suyo 1 1 L Safety and mc E1 3 1 2 1 Tor the Purpose Intendedz di a E1 3 1 2 2 Wnpackins ang InspecHOD os od u dude E1 3 1 2 3 a 1 3 PEN Cr E2 1 2 1 Scope e
62. eter VI True RMS AC voltmeter V2 V5 Digital DC voltmeter G1 Sine wave generator with balanced output min 20 Hz 20 kHz lt 0 02 THD Mw Voltmeter THD meter phase meter RLw RLt Dummy load resistors 10 Q approx 10 W Note MI Mw Mt can be replaced by a universal audio test system Audio Precision System One or equivalent 4 3 1 2 A1 Initial Settings Note Replacement backpanel assemblies or amplifier units come factory pre adjusted Adjustment of the quiescent current is therefore not necessary after replacement checking is recommended nevertheless Unplug the speaker cables from the PCB do not connect any load to the amplifier outputs Make sure that none of the cable ends contacts the PCB Set the level potentiometer to CAL position fully counterclockwise Set trimmer potentiometers RT190 and RT290 quiescent current to min position fully counterclockwise e set to min 0 Vac Power switch to ON position 4 3 1 3 A1 Powering Up e Visually check the PCB and the solder T and repair if s e Check the mains voltage 230 29V 115 e Check or insert the primary fuse T05AL250V T10AL250V Connect the generator according to the diagram Slowly increase the variac output while checking the primary current lt 40 mAac lt 80 mAac The green Power LED illuminates Increase the variac output until V1 is 56 Vac 4 3 1 4 A1
63. expressly marked on the product If a special design should be covered by a higher CLASS LASER PRODUC class of this standard the device concerned will be marked directly on the assembly or sub assembly in accordance with the above standard A1 First Aid In Case of Electric Shock Separate the person as quickly as possible from the electric power source By switching off the equipment By unplugging or disconnecting the mains cable or By pushing the person away from the power source using dry insulating material such as wood or plastic After having sustained an electric shock always consult a doctor Warning Do not touch the person or his clothing before the power is turned off otherwise you stand the risk of sustaining an electric shock as well If the Person is Unconscious Check the pulse Reanimate the person if respiration is poor Lay the body down turn it to one side call for a doctor immediately Date printed 17 08 04 Installation STUDER B General Installation Hints Please consider besides these general hints also any product specific hints in the Installation chapter of this manual B1 Unpacking Check the equipment for any transport damage unit that is mechanically damaged or that has been penetrated by liquids or foreign objects must not be connected to the AC power outlet or must be immediately disconnected by unplugging the power cable Repairs must only be perfor
64. ext to video or computer monitors or measuring instruments Four tapped M6 inserts are located on the bottom of the A5 and A3 units They can be used for mounting it on a base plate a wall mount kit or a stand refer to section 2 2 Options The A5 cannot be mounted with a ceiling mounting kit When mounted on a stand or wall mount please make sure that the tilting angle in either di rection does not exceed 30 The Al is shipped with a threaded mounting bracket for easy installation on a microphone stand The A series has been aligned for free placement i e not close to walls or in edges Ideal mounting distances are 1 2 m from walls and at least 60 cm from the floor If operation of the A5 or A3 units near room boundaries is required the resulting bass boost can be compensated with the ROLL OFF control On the Al unit the ROLL OFF control is not available because this type and size of loudspeaker usually is not operated near room boundaries Date printed 29 02 00 STUDER 2 GENERAL 2 1 Scope of Delivery 2 2 Options Date printed 29 02 00 A Series Active Monitor Speakers The Studer A series active speakers are shipped with an operating manual order no 10 27 4551 and either an IEC 320 C13 socket or an IEC mains cable depending on your country Order No Wall mount kit for A5 and A3 20 020 230 04 OmniMount with adjustable tilt Caution The maximum tilting angle of the A5 must not exceed 30 Floo
65. he programs of third parties The Customer waives any and all claims versus Studer for any consequential damages which might occur due to defects of these programs Studer grants the Customer the non exclusive right to use the License Ma terial in one copy on the system and or its options as laid down by the Sales Agreement concluded between the parties and all Terms and Condi tions which shall be deemed to form and be read and construed as part of the Sales Agreement This right is assignable according to the Assignabil ity paragraph hereinafter The Customer is not entitled to alter or develop further the License Mate rial except within the expressly permitted configuration possibilities given by the software installed on the system or elsewhere altered programs including but not limited to the products altered within the permitted con figuration possibilities are covered by this License Agreement Appendix STUDEH Reverse Engineering Copying the License Material Disclosure of License Material Assignability Rights to License Material Warranty Disclaimer and Liability XII Reverse engineering is only permitted with the express consent of Studer The consent of Studer can be obtained but is not limited to the case in which the interface software can not be provided by Studer In any case Studer has to be informed immediately upon complete or partial reverse engineering The Customer is en
66. hot generator output to both input terminals no 2 and 3 cold generator output to input terminal no 1 GND Stes Generator Measurement No Description Id Value Testpos Type Value Limits 0 dBV 50 Hz sine wave Mi Level 60dBV 2 CMRR1kHz 01 j0dBV kHzsnewave M level 60dBV 3 CMRR OkHz 01 jOdBV OkHzsimewave M Level 40dBV 2 Common mode rejection dBV 100 Hz Date printed 29 02 00 Service E4 27 A Series Active Monitor Speakers STUDER 4 5 1 7 A5 Quiescent Current Setting Procedure 1 Measure the primary current Al 70 80 for 230 V or 140 160 mA c for 115 V and note the measured value 2 Adjust RT390 turn carefully clockwise for a reading of Al 4 mAgc for 230 V or Al Al 8 mA c for 115 V and note the measured value 3 Adjust RT290 turn carefully clockwise for a reading of Al Al 8 mA c for 230 or Al 1 16 mA c for 115 V and note the measured value 4 Adjust RT190 turn carefully clockwise for a reading of 14 12 mA c for 230 or Aly Al 24 for 115 V and note the measured value 5 Connect all 3 dummy load resistors 10 10 W each and check the pri mary current again Als 14 0 5 for 230 V or Als 14 1 mA c for 115 V 4
67. human being several feet away from the microphone can cause several dB change in the measured value Changes in the order of a few inches in microphone or loudspeaker placement can cause response curve variations of many dB at high frequencies Even at fixed speaker and microphone locations and with no people moving within a reasonable dis tance a response curve may show individual sharp peaks and dips of 10 20 dB due to standing wave effects For reasonable results some degree of acoustical treatment of the measure ment location should be done Commercially available sound absorption materials should be applied to wall ceiling and floor surfaces It may be ef fective to design the shape of the test chamber as something other than a rectangle to avoid high intensity single bounce reflections from the back wall into the measurement microphone Since it is not economically practical to provide a true anechoic chamber for most testing speaker measurements in a reflective space are almost invaria Date printed 29 02 00 STUDER A Series Active Monitor Speakers bly smoothed by one technique or another to improve measurement repeat ability and reduce the visible effect of reflections to a value more consistent with a human s ability to hear them Even simple analog measurement tech niques where no smoother appears as such on a block diagram do in fact typically smooth due to the sweep rates and measurement response times used
68. ic 100 pF Polyester 7 5 mm 3 3 nF 400 V Polyester 7 5 mm 3 3 nF 400 V Ceramic 100 pF Polyester 7 5 mm 3 3 nF 400 V Polyester 7 5 mm 3 3 nF 400 V Ceramic 100 pF Polyester 7 5 mm 1 nF 630 V Polyester 7 9 mm 1 nF 630 V Ceramic 100 pF Polyester 7 5mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 620 V Ref CE1 9 CF1 CF3 CF9 D271 0272 0273 0274 0291 0292 0371 0372 0373 T1274 40198 D380 D381 D391 D392 DZ1 DZ2 DZ3 J1 J2 J3 J4 Jt11 Jt12 Jt13 NTC1 Q1 Q2 Q40 Q271 Q272 Q273 Q274 Q275 Q276 Q277 Q280 Q281 Q282 Q283 Q284 Q285 Q290 Q371 9372 9373 9374 Q375 Q376 Q377 Q380 Q381 Q382 Q383 Q390 A Series Active Monitor Speakers Value Ceramic 100 pF Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Ceramic 100 pF Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V 1N4935 fast recovery 1 4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery not used not used 1 4935 fast recovery 1N4935 fast recovery BZTO3C Z 18 V BZTO3C Z 18 V BZX85C Z 27 V Flat pin 2 8 mm Flat pin 2 8 mm Flat pin 2 8 mm Connector 36 pin m right Flat pin 4 8 mm Flat pin 4 8 mm Flat pin 4 8 mm 150k thread M3 TIP127 PNP TIP122 NPN BS
69. icense Programs of Studer Programs of Third Parties Right of Use Principle Customized Configurations Date printed 17 08 04 The following Terms and Conditions grant the right to use all programs of Studer that are part of the System and or its options at the time of its deliv ery to the Customer as well as the installation software on the original data disk and the accompanying documentation License Material In this Agreement the word Programs shall have the meaning of programs and data written in machine code Using the software indicates your acceptance of this license agreement If you do not accept these license terms you are not authorized to use this software Programs of third parties are all programs which constitute part of the System and or its options at the time of delivery to the Customer but have not been developed by Studer The following conditions are applicable to programs of third parties The right to use third parties programs is governed by the License Agreement attached hereto if applicable which 1s an integral part of this Agreement The Customer shall sign any and all License Agree ments for all further programs of third parties installed on the system The Customer shall be deemed to have received all License Agreements upon delivery of the system and or its options Studer shall accept no responsibility or liability for and gives no war ranties express or implied as to t
70. ing normal operation The TDS technique or any swept sine method concentrates all the input energy into a single loudspeaker driver at any single moment during the sweep which can change driver characteristics during the test Service E4 39 STUDER A Series Active Monitor Speakers CONTENTS DIAGRAM SECTION Al A3 A5 Overall Diagram Overall Diagram Overall Diagram Power Supply Power Supply Power Supply Delay Delay Delay HF Amp HF Amp HF Amp LF Amp LF Amp MF Amp Layout Multipin Connector LF Amp Parts List Layout Layout Parts List Parts List Date printed 10 03 00 SECTION 5 STUDER A Series Active Monitor Speakers Al Overall Diagram C241 C242 C240 R242 RT200 z A1 HF AMP N 15V OUT 2 R249 IN R291 246 epe 2 PE R247 D 2 04V 4 Rus 2143 2 040 C142 UD1B NB R144 Kon R142 lt R145 A1 LE AMP C52 5V Q pee ADJA N T UD14 RTI T 15V 18 INA 1 148 lt IN R194 2 o A1 DELAY C149 2 R14 D191 D192 C146 191 15V A1 POWER SUPPLY R7 4 POWER LED J5 rM POWER LED SECTION 5 A Series Active Monitor Speakers STUDER Power Supply O de pr DD YLO SECTION 5 STUDER A Series Active Monitor Speakers
71. ive Studio Monitor serial no 190916 and up Studer A3 Active Studio Monitor serial no 183701 and up Studer A5 Active Studio Monitor serial no 181700 and up to which this declaration relates according to following regulations of EU directives and amendments Low Voltage LVD 73 23 EEC 93 68 EEC Electromagnetic Compatibility EMC 89 336 EEC 92 31 EEC 93 68 EEC are in conformity with the following standards or other normative docu ments Safety Class I equipment EN 60065 1993 EMC EN 55103 1 2 1996 electromagnetic environments E2 and EA Y verdon March 31 1999 Alain Roux Director VII Appendix STUDER Appendix 1 Air Temperature and Humidity General Ambient Temperature Frost and Dew Vill Example Normal operation of the unit or system is warranted under the following ambient conditions defined by EN 60721 3 3 set IE32 value 3K3 This standard consists of an extensive catalogue of parameters the most important of which are ambient temperature 5 40 relative humidity 5 85 i e no formation of condensation or ice absolute humidity 1 25 g m rate of temperature change lt 0 5 C min These parameters dealt with in the following paragraphs Under these conditions the unit or system starts and works without any problem Beyond these specifications possible problems are described in the following paragraphs Units and systems by Studer are ge
72. ivity continuously adjustable Low distortion rating the magnetic flux is stabilized by damping the coil reaction Exceptional damping of the individual systems by negative output imped ance of the power amplifiers Matched signal propagation delay between the individual transducers through separate electronic delay lines Group delay compensated band pass filters A speaker diaphragm should accurately follow the electrical excitation In the Studer A series active speakers this is achieved with negative output impedance in all power amplifiers which efficiently attenuates undesired echo oscillations of the diaphragm Each of the frequency ranges features its Own power amplifier with negative output impedance This forces the diaphragm to exactly follow the input signal and undesired responses dia phragm and enclosure echoes are suppressed Percussive signals in par ticular e g applause are reproduced very accurately This principle is also an essential prerequisite for other improvements Utilization of optimum crossover network techniques Other distortion reduction measures Welcome E1 1 A Series Active Monitor Speakers STUDER Helmholtz resonator Group delay compensated filters Delay compensation Ideally suited for surround sound E1 2 Welcome A cavity with an external opening is referred to as Helmoltz resonator If a driven diaphragm is added to this system the well known bass reflex en closure is o
73. k vertical Trimmar natantinmatar 2l vartinal Ci VCI Trimmer potentiometer 2k vertical Trimmer potentiometer 2k vertical Trimmer potentiometer 10k vertical Trimmer potentiometer 10k vertical Trimmer potentiometer 2k vertical Trimmer potentiometer 10k vertical Rectifier B 80C2300 1500 Line input transformer Studer 426 00 TLO72CP dual opamp TLO72CP dual opamp T 01706 D Anal anamn ILUI eor TLO72CP dual opamp TLO72CP dual opamp TLO72CP dual opamp TLO72CP dual opamp TLO72CP dual opamp STUDER STUDER A Series Active Monitor Speakers A5 Overall Diagram C342 1 C340 22 R316 R306 s R341 RT300 R333 5 U4B LU A5 HF AMP E C318 C313 2 Na C308 C303 jt s F SEN 1 334 Standby OUT R314 R349 T ms 0058 PP 0M Tweeter 15V 0392 tl 1 4 0068 R332 Po9 OUTM pul UD8B PMC 4 INM PM C242 CR R242 R241 C A5 MF AMP 15 9 L OUTL GND UD8A INL i BJ R218 R213 Ly OUTI ft 4 GND UD6A IN dem C214 p Standby PM 1 R249 I T Se 1 IN R291 R294 enp UD5A
74. l 0 100 50 10 20 20 10 5 30 40 0 5 90 0 2 60 0 1 THD N Ratio 0 05 10 I 80 0 01 20 50 100 200 500 1k 2k 5k 10 k 20 k Hz E4 6 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 3 1 9 A1 Tweeter Amplifier Output Connect only the dummy load 10 Q _ Measurement Description Id Type Value Limits Tweeter output level 20 dBV 8 1 kHz sine wave 0 dBV 40 25 dB Tweeter output THD 20 dBV 8 1 kHz sine wave THD N Tweeter output Ap rel dtl Anlr Level NS 100 1 dBV LE Itt On 80 40 50 100 200 500 1k 2k 5k 10 k 20 k 40 k Date printed 29 02 00 Service E4 7 A Series Active Monitor Speakers STUDER 4 3 1 10 A1 Limiter Threshold Disconnect all dummy load resistors Stes 2 Description ld Value Value Limits HF limiter 10 dBV 10 kHz sine wave 8 5dBV 2dBV The Mw and Mt output levels must be reduced Limiter Threshold dBV Hz E4 8 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 3 2 A1 Checks on the Assembl
75. ls please take care that the surrounding building structure allows for sufficient capacitive coupling of the opcrator This coupling can be improved by an additional conducting surface in the operator s area connected to the equipment housing e g metal foil underneath the floor covering carpet with conductive hacking C Maintenance All air vents and openings for operating elements faders rotary knobs must be checked on a regular basis and cleaned in case of dust accumula tion For cleaning a soft paint brush or a vacuum cleaner is recommended Cleaning the surfaces of the unit is performed with a soft dry cloth or a soft brush Persistent contamination can be treated with a cloth that is slightly humidi fied with a mild cleaning solution soap suds For cleaning display windows commercially available computer TV screen cleaners are suited Use only a slightly damp never wet cloth Never use any solvents for cleaning the exterior of the unit Liquids must never be sprayed or poured on directly For equipment specific maintenance information please refer to the corre sponding chapter in the Operating and Service Instructions manuals D Electrostatic Discharge during Maintenance and Repair Caution Observe the precautions for handling devices sensitive to electrostatic dis 5 charge A Many semiconductor components are sensitive to electrostatic discharge ESD The life span of assemblies containing such components
76. m length sequence analysis These include Time Delay Spectrometry TDS and impulse testing They all provide quasi anechoic frequency re sponse measurements of the loudspeaker alone unaffected by room reflec tions All share the limitation that this anechoic response is useful only above a critical frequency determined by the physical dimensions of the test environment In the illustration below for example the direct signal arrives 2 91 ms after it leaves the loudspeaker and the first reflection arrives 9 2 ms after leaving the speaker An anechoic measurement by any of these tech niques must ignore reflections and therefore can only look at about 6 3 ms of pure first arrival signal before the first reflection Meaningful amplitude measurements cannot be made without acquiring at least one full cycle of signal and accurate measurements require several cycles For the 6 3 ms example the frequency corresponding to this time span is about 160 Hz If useful frequency response is desired down to 35 Hz for example then the portion of signal to be converted must be a minimum of 1 35 s 28 ms and ideally closer to 1 10 s 100 ms In the example as well as in most realistic actual rooms this longer time necessarily includes several reflections and the response is no longer anechoic Second reflection 14 8 ms for wall 2 xd spaced 2 5 m 2 91 ms at 1 m spacing 2 7 7 First reflection 7 7
77. med by trained personnel in accordance with the applicable regulations B2 Installation Site Install the unit in a place where the following conditions are met The temperature and the relative humidity of the environment must be within the specified limits during operation of the unit Relevant air val ues are the ones at the air inlets of the unit Condensation must be avoided If the unit is installed in a location with large variation of ambient temperature e g in an OB van feasible measures must be taken before and after operation for details on this subject refer to Appendix 1 Unobstiucted flow is essential for proper operation Air vents of the unit are a functional part of the design and must not be blocked in any way during operation e g by objects placed upon them or placement of the unit on a soft support The unit must not be heated up by external sources of heat radiation sunlight spot lights B3 Earthing and Power Supply Earthing of units with mains supply class I equipment is performed via the protective earth PE conductor integrated in the mains cable Units with battery operation 60 V class III equipment must be earthed sepa rately Earthing the unit is one of the measures for protection against electrical shock hazard dangerous body currents Hazardous voltage may not only be caused by a defective power supply insulation but may also be intro duced by the connected audio o
78. mm 220 nF 100 V Polyester 7 5 mm 220 nF 100 V Polyester 7 5 mm 100 nF 100 V Polyester 7 5 mm 47 nF 00 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Electrolytic radial 22 uF V not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 1 nF 630 V Polyester 7 5 220 nF 100 V Electrolytic radial 22 uF 63 V Polyester 7 5 mm 100 nF 100 V Polyester 7 5 mm 100 nF 100 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 22 nF 250 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Electrolytic radial 22 uF 3 V not used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF 63 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 1 nF 6 0 V Polyester 7 5 mm 10 nF 250 V Polyester 7 5 mm 1 nF 609 V Polyester 7 5 mm 4 7 nF 100 V Electrolytic radial 22 uF 63 V Ceramic 100 pF Electrolytic radial 22 uF 63 V not used Polyester 7 5mm 1 nF 630 V Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 220 nF 100 V Electrolytic radial 22 uF 63 V Ref CA2 CA4 CAS MAC WAG 8 2 4 CBS CB6 8 2 4 5 OO UUU CC8 CD2 CD4 CDS CD6 CD CD8 boi CE2 CE4 CES CE8 CF2 CF4 CF5 CF6 CF
79. n carefully clockwise for a reading of Al Al 6 mA c for 230 V or Al Al 12 for 115 V and note the measured value 4 Connect both dummy load resistors 10 0 10 W each and check the pri mary current again Al 0 5 mA c for 230 V or 14 1 for 115 V E4 16 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 4 1 8 A3 Woofer Amplifier Output Connect only the RLw dummy load 10 Stes Generator No Description Value amp Type Value Limits Date printed 29 02 00 Service E4 17 A Series Active Monitor Speakers STUDER 4 4 1 9 A3 Tweeter Amplifier Output Connect only the dummy load 10 Q Stes Geneatr Measurement Description Id amp Type Value Limits Tweeter output level 16 8 dBV 5 5 kHz sine wave 0 dBV 40 25 dB Tweeter output THD 16 8 dBV 5 5 kHz sine wave THD N Tweeter output 20 10 5 1 Anlr Level A _ 400 50 10 _ 20 20 __ 10 5 83 30 pe _ 2 40 1 0 5 50 wl 0 2 60 E 0 1 0 05 10 E _ 0 02 80 0 01 40 50 100 200 500 1k 2k 5k 10 k 20 k 40 k E4 18 Servic
80. nerally designed for an ambient tem perature range i e temperature of the incoming air of 5 40 When rack mounting the units the intended air flow and herewith adequate cool ing must be provided The following facts must be considered The admissible ambient temperature range for operation of the semi conductor components is 0 C to 70 C commercial temperature range for operation The air flow through the installation must provide that the outgoing air is always cooler than 70 C Average heat increase of the cooling air shall be 20 K allowing for an additional maximum 10 K increase at the hot components In order to dissipate 1 kW with this admissible average heat increase an air flow of 2 65 m min is required A rack dissipating 800 W requires an air flow of 0 8 2 65 m min which corresponds to 2 12 m min Ifthe cooling function of the installation must be monitored e g for fan failure or illumination with spot lamps the outgoing air temperature must be measured directly above the modules at several places within the rack The trigger temperature of the sensors should be 65 to 70 C The unsealed system parts connector areas and semiconductor pins allow for a minute formation of ice or frost However formation of dew visible with the naked eye will already lead to malfunctions In practice reliable operation can be expected in a temperature range above 15 if the fol lowing general
81. ng any material that can be recycled 15 Please take care that your used equipment cannot be abused To avoid abuse delete sensitive data from any data storage media After having dis connected your used equipment from the mains supply make sure that the mains connector and the mains cable are made useless Date printed 17 08 04 STUDEH Conformity G Declarations of Conformity G1 Class A Equipment FCC Notice This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide a reasonable protection against harmful interfer ence when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which casc the uscr will be required to correct the interference at his own expense Caution Any changes or modifications not expressly approved by the manufacturer could void the user s authority to operate the equipment Also refer to rele vant information in this manual G2 CE Declaration of Conformity Date printed 17 08 04 The manufacturer RELEC SA CH 1400 Yverdon declare under his sole responsibility that the products Studer A1 Act
82. ns voltages of 115 or 230 Vac 50 to 60 Hz Also check for correct value of the primary fuse USA and Canada 230 V T 0 5 AL 250 V 5 x 20 mm 115 V T 1 0 AL 250 V 5 x 20 mm USA and Canada 115 V 1 0 A slow blow UL CSA 5 x 20 mm Depending on your country the A Series Active Monitor Speakers come with an IEC mains cable or a female IEC 320 C13 mains cable socket This socket has to be connected to an appropriate mains cable by a trained tech nician with respect to your local regulations Refer to the Installation sec tion at the beginning of this manual USA and Canada 115 V 1 6 A slow blow UL CSA 5 x 20 mm Welcome E1 3 A Series Active Monitor Speakers STUDER Danger Humidity Ventilation Magnetic radiation Mounting facilities E1 4 Welcome Location Repair work may only be performed by a trained service technician The primary fuse must be replaced by a spare fuse of exactly the same type The unit must not be opened by the user because of the risk of a severe electric shock hazard Do not use the units near any source of moisture or in excessively humid environments In order to guarantee adequate air circulation the unit s rear side must not be mounted closer than 6 cm from a wall Do not mount the A5 and A3 units closer than 40 cm from a video or com puter monitor Thanks to low magnetic dispersion drivers and additional screening the Al units can be operated also n
83. ote The A series speakers can also be driven by unbalanced sources Hi Fi In that case use a cable according to the diagram below Ax input Unbalanced output XLR 3m plug rear view 7 Pilot LEDs A Series speakers feature a green Power On LED The Al speaker is overload protected by a limiter function without LED indicator On the A3 and A5 speakers the red Alarm LED on the front panel indi cates as follows Red Alarm LED Audio output status Normal operation conditions No limiting or muting Chassis overload Output is attenuated to a safe level flickerin limiter active 9 until input signal is reduced Overheat detection Output is muted above approx 65 75 C until amplifier is cooled down 8 Midrange tweeter unit 45 only If the A5 cannot be set up vertically which in fact is the recommended position its midrange tweeter assembly can be rotated by 90 degrees To do so switch the speaker off and unplug the mains connection loosen the 4 mounting screws Allen screwdriver no 4 of the midrange tweeter assembly Because it fits quite tightly you can use one of the four recesses located at the circumference of the midrange speaker to pull out the as sembly carefully Reinsert it after having turned it by the required angle and re tighten the four screws in order to get a sealed joint again E3 4 Operation Date printed 26 07 04 STUDER A Series Active Monitor Speakers 4 SERVICE IN
84. parated when the equipment is switched off and after any capacitor charges have decayed Date printed 17 08 04 Removal of housing parts shields etc exposes energized parts For this reason the following precautions must be observed Maintenance may only be performed by trained personnel in accordance with the applicable regulations The equipment must be switched off and disconnected from the AC power outlet before any housing parts are removed Even if the equipment is disconnected from the power outlet parts with hazardous charges e g capacitors picture tubes must not be touched until they have been properly discharged Do not touch hot components power semiconductors heat sinks etc before they have cooled off If maintenance is performed on a unit that is opened and switched on no un insulated circuit components and metallic semiconductor housings must be touched neither with your bare hands nor with un insulated tools Certain components pose additional hazards Explosion hazard from lithium batteries electrolytic capacitors and power semiconductors watch the component s polarity Do not short battery terminals Replace batteries only by the same type Implosion hazard from evacuated display units Radiation hazard from laser units non ionizing picture tubes ioniz ing Caustic effect of display units LCD and components containing liquid electrolyte Such components should only be handled by trained
85. perience collected during more than 40 years of business in the profes sional audio products field you may expect that the performance of your new unit will fulfill your highest demands With the A series Studer has created a family of active speaker systems With exterior dimensions kept at a minimum but nevertheless with high sound pressure levels these speakers are suited for many different applica tions For audition rooms and continuity cubicles for the editing studio and control rooms for use in mobile applications or OB vans the A series offers ideal problem oriented solutions The Studer A series active speakers can be adjusted to any individual re quirement by means of various controls Differences in operating levels or differences due to speaker placement can be compensated thanks to the vari able input sensitivity and the bass roll off controls For horizontal place ment the A5 s mid range tweeter unit can be rotated by 90 after loosening four screws To meet professional standards the A series Is equipped with XLR compatible connector and electronically balanced line input A1 or trans former balanced line input A3 and A5 The most important characteristics of the A series active speakers can be summarized as follows Active 2 or 3 way speakers for high sound pressure levels in near field applications or medium and large sized monitoring rooms Suited for all commonly used operating levels input sensit
86. personnel who are properly protected e g safety goggles gloves Repair Disposal STUDER E1 VI SMD Components Disposal Disposal of Packing Materials Disposal of Used Equipment Studer does not keep any commercially available SMD components in stock For repair the corresponding devices should be purchased locally The specifications of special components can be found in the service man ual SMD components should only be replaced by skilled specialists using ap propriate tools No warranty claims will be accepted for circuit boards that have been damaged Proper and improper SMD soldering joints are illus trated below SMD Soldering Iron Coppa Component N Track Solder PCB Adhesive Dismounting Desoldering e Iron Soldering Iron Desolder A Z Desolder Wick NN Wick M 4 Heat and Remove Cleaning Mounting Examples 20 mm e Heating Time 3 s per Side The packing materials have been selected with environmental and disposal issues in mind All packing material can be recycled Recycling packing saves raw materials and reduces the volume of waste If you need to dispose of the transport packing materials please try to use recyclable means Used equipment contains valuable raw materials as well as materials that must be disposed of professionally Please return your used equipment via an authorized specialist dealer or via the public waste disposal system en suri
87. r control cables If the unit is installed with one or several external connections its earthing must be provided during operation as well as while the unit is inoperative If the earthing could be interrupted via the power supply e g by pulling the mains plug an additional permanent earthing must be installed using the provided earth terminal Avoid ground loops hum loops by keeping the loop surface as small as possible by consequently guiding the earth conductors in a narrow paral lel way and reduce the noise current flowing through the loop by inserting an additional impedance common mode choke Date printed 17 08 04 STUDER Installation Class I Equipment Mains Operation Should the equipment be delivered without a matching mains cable the latter has to be prepared by a trained person using the attached female plug IEC320 C13 or IEC320 C19 with respect to the applicable regulations in your country Before connecting the equipment to the AC power outlet check that the local line voltage matches the equipment rating voltage frequency within the admissible tolerance The equipment fuses must be rated 1n accordance with the specifications on the equipment Equipment supplied with a 3 pole appliance inlet protection conforming to class I equipment must be connected to a 3 pole AC power outlet so that the equipment cabinet is connected to the protective earth For information on mains cable strain relief please refer to
88. r stand for A5 and A3 20 020 230 21 Moveable floor stand complete with 4 castors rugged aluminium design Adjustable column height Maximum carrying capacity 40 kg Floor stand for A5 and A3 10 705 214 60 Foldable tripod floor stand Adjustable column height 1 25 2 3 m Maximum carrying capacity 50 kg Woofer protection grille for A1 15 258 211 00 Set for one Al speaker containing a protection grille mounting hardware and instruction sheet Operating Instructions additional manual 10 27 4551 Operating and Service Instructions 10 27 4540 General E2 1 A Series Active Monitor Speakers STUDER 2 3 Block Diagrams E2 2 General Studer A5 D FEED BACK DELAY LINE FEED PWR BACK INPUT TRANSF ROLLOFF LIM LEVEL f i 115 230 V TV Temp SENS FEED PWR BACK LIMIT MAINS ON OFF FUSE MAINS TRANSF RECT REG POWER Studer A3 gt FEED BACK AMP DELAY LINE INPUT TRANSF ROLLOFF LIM LEVEL FEED PWR BACK LIMIT MAINS ON OFF FUSE MAINS TRANSF RECT REG POWER Studer A1 FEED BACK PWR AMP DELAY LINE LIM LEVEL FEED PWR BACK 115 230 V 38 V 17 V POWER MAINS ON OFF FUSE MAINS RECT REG TRANSF Date printed 29 02 00 STUDER A Series Active Monitor Speakers 2 4 Technical Specifications preliminary s
89. rity Note For more information on frequency response measurements please refer to section 4 6 E4 10 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 3 2 5 A1 SPL and EQ Fine Adjustment Set balanced generator to 245 mVRMS i e 12 2 dBV or 10 dBu e Plot frequency response sweep m tolerance according to the graph below EQ fine adjustment possibilities 1 Overall tweeter level 4 20 KHz with trimmer potentiometer RT200 2 Tweeter level 12 2 kHz with trimmer potentiometer RT1 3 Tweeter level 20 kHz with trimmer potentiometer RT2 Note Basic setting of and RT2 refer to section 4 3 1 5 SPL 1m 48 PSS 5 5 68898884989894880889844889848898899888 8 889898 868890890989 8 859489898948889 84888984 888998889089848885984 65856808 8 9884 88089489 649 406988 20 90 100 200 500 1k 2k ok 10 k 20 k Hz 4 3 2 6 A1 Distortion Check Set balanced generator to 245 mVRMS i e 12 2 dBV or 10 dBu
90. rule is considered for putting the cold system into opera tion If the air within the system is cooled down the relative humidity rises If it reaches 100 condensation will arise usually in the boundary layer be tween the air and a cooler surface together with formation of ice or dew at sensitive areas of the system contacts IC pins etc Once internal con densation occurs trouble free operation cannot be guaranteed independent of temperature Date printed 17 08 04 Appendix Before putting into operation the system must be checked for internal for mation of condensation or ice Only with a minute formation of ice direct evaporation sublimation may be expected otherwise the system must be heated and dried while switched off A system without visible internal formation of ice or condensation should be heated up with its own heat dissipation as homogeneously and subse quently as slow as possible thc ambicnt tcmpcraturc should then always be lower than the one of the outgoing air If it is absolutely necessary to operate the cold system immediately within warm ambient air this air must he dehydrated Tn such a case the ahsolute humidity must be so low that the relative humidity related to the coldest system surface always remains below 100 Ensure that the enclosed air is as dry as possible when powering off 1 6 before switching off in winter aerate the room with cold dry air and re move humid objects as
91. s STUDER 4 5 2 5 A5 SPL and EQ Fine Adjustment Set balanced generator to 250 mVRMS i e 12 0 dBV or 9 8 dBu e Plot frequency response sweep m tolerance according to the graph below EQ fine adjustment possibilities Overall tweeter level 3 20 kHz with trimmer potentiometer RT300 Overall mid range level 450 Hz 3 kHz with trimmer pot RT200 Tweeter level 6 8 kHz with trimmer potentiometer RT1 Tweeter level 8 8 kHz with trimmer potentiometer RT2 Tweeter level 14 7 kHz with trimmer potentiometer RT3 Tweeter level 22 0 kHz with trimmer potentiometer RT4 Note Basic setting of RTI through RT4 refer to section 4 5 1 5 gt t gt 9 SPL 1m 4 5 2 6 A5 Distortion Check Set balanced generator to 250 mVRMS i e 12 0 dBV or 9 8 dBu e Plot a 20 Hz 20 kHz THD sweep 1 m tolerance according to the graph below 20 90 100 200 500 1 2 5k 10 k 20 k Hz E4 34 Service Date printed 29 02 00 STUDER A Series Active Monitor Speakers 4 5 2 7 A5 Polarity Check e Place the measurement microphone at a distance of 10 cm from the baffle and exactly in the center of the woofer Stes Generator Measurement Description Id
92. s as the microphone is moved off the speaker axis Unless the loudspeaker is being measured in an expensive anechoic chamber or in essentially free space outdoors reflections of the sound waves will also arrive at the microphone and create standing wave patterns with cancellations and reinforcements Multi way loudspeaker systems ported loudspeaker systems and systems with some of the drivers facing the sides or rear of the cabinet all create a problem for measurement microphone placement just where should the microphone be located so that it receives acoustical output which is a proper combination of the vari ous drivers and ports Furthermore the end use of the speaker will not be in an anechoic chamber or laying on its back outdoors with listeners suspended above it so what is the proper environment in which to measure it 4 6 2 Standing Waves Reflections and Smoothing E4 36 Service Neither an anechoic chamber nor outdoor free space testing are practical for production testing In most test locations acoustical reflections and ambient acoustical noise are facts of life Particularly at the higher frequencies the acoustical energy arriving at the microphone is a combination of the direct signal from speaker to microphone plus a large number of reflections from walls ceiling floor human operators etc In a typical office or laboratory environment when using high frequency sinewave signals 10 kHz for ex ample movement of a
93. sine wave 0 dBV 40 25 dB Tweeter output THD 15 6 dBV 8 8 kHz sine wave THD N Tweeter output 20 10 0 _ 100 5 10 8 20 20 _ 10 5 gt e 30 D 2 40 1 05 50 g 0 2 60 _ 0 1 0 05 10 1 002 80 0 01 30 50 100 200 500 1k 2k 5k 10 k 20k 30k Hz E4 30 Service Date printed 29 02 00 A Series Active Monitor Speakers STUDER 4 5 1 11 A5 Limiter Threshold e Disconnect all dummy load resistors Generator Measurement Description Id Testpos Type Value Limits 15 dBV 10 kHz sine wave Alarm LED must be on and the Mw Mm and Mt output levels must be reduced Limiter Threshold 40 30 m 50 100 200 50 1k dBV 10 0 Hz 4 5 1 12 5 Overheat Protection Check e Connect Rdt 22 according to the diagram in section 4 5 The red Alarm LED must come on The Mw Mm and Mt signals must be muted Date printed 29 02 00 Service E4 31 A Series Active Monitor Speakers STUDER 4 5 2 A5 Checks on the Assembled Unit 4 5 2 1 A5 Required Test Tools C Anechoic room True RMS AC ammeter GHT High voltage generator 1 8 kV 50 Hz max 10 mA Sweep sine wave generator with balanced output AudioPrecision System One or equivalent
94. sound source positioning Date printed 29 02 00 STUDER A Series Active Monitor Speakers 12 Safety and Connections 1 2 1 Utilization for the Purpose Intended The Studer A series active speakers are designed for professional use It is presumed that the units are operated only by trained personnel servicing must be performed by qualified experts The electrical connections may be connected only to the appropriate volt ages and signals specified in this manual Please consult the Safety and EMC sections at the very beginning of this manual 1 2 2 Unpacking and Inspection 1 2 3 Installation Before any connection Mains cable Date printed 29 02 00 Your new unit is shipped in a special packing which protects it against me chanical shock during transit Care should be exercised when unpacking so that its surfaces do not get marred Verify that the content of the packing agrees with the items listed on the enclosed shipping list Check the condition of the equipment for signs of shipping damage If there should be any complaints please immediately no tify the forwarding agent and your nearest Studer distributor Please retain the packing material because it offers the best protection in case your unit ever needs to be transported Check the line voltage selector setting before connecting the unit to the mains The voltage selector is located inside the fuse holder next to the power inlet The unit can be operated on mai
95. surface to be adhered to must be clean dry and free from grease oil or other contaminants Recommended application temperature range is 20 40 C Remove the plastic protective backing fram the rear side of the clamp and apply it firmly to the surface at the desired position Allow as much time as possible for curing The bond continues to develop for as long as 24 hours For improved stability the clamp should be fixed with a screw For this purpose a self tapping screw and an M4 bolt and nut are included Place the cable into the clamp as shown in the illustration above and firmly press down the internal top cover until the cable is fixed Date printed 17 08 04 STUDER Appendix Appendix 3 Software License Use of the software is subject to the Studer Professional Audio Software License Agreement set forth below Using the software indicates your ac ceptance of this license agreement If you do not accept these license terms you are not authorized to use this software Under the condition and within the scope of the tollowing Terms and Con ditions Studer Professional Audio GmbH hereinafter Studer grants the right to use programs developed by Studer as well as those of third parties which have been installed by Studer on or within its products References to the license programs shall be references to the newest release of a li cense program installed at the Customer s site Programs Covered by the Agreement L
96. through 6 until all values are within the given limits dBr 20 dBV No RO 5 40 50 100 200 500 1k 2k 5k 10 k 20 k 40 k Date printed 29 02 00 Service E4 15 A Series Active Monitor Speakers STUDER 4 4 1 6 A3 Input Common Mode Rejection Ratio CMRR e Connect the generator in common mode to the input i e hot generator output to both input terminals 2 and cold generator output to input terminal no 1 GND Stes Measurement Description Id Value Type Value Limits 0 dBV 50 Hz sine wave Mi Level 60dBV 2 CMRR1kHz 01 j0dBV kHzsnewave level 60dBV 3 CMRR OkHz 01 jOdBV OkHzsimewave M level 40dBV 2 Common mode rejection 0 dBV 100 20 50 100 200 500 1k 2k ok 10 k 20 k Hz 4 4 1 7 A3 Quiescent Current Setting Procedure 1 Measure the primary current Al 40 50 mA Ac for 230 V or 80 100 mA c for 115 V and note the measured value 2 Adjust RT390 turn carefully clockwise for a reading of Al Al 3 for 230 V Or 1 Al 6 for 115 V and note the measured value 3 Adjust RT290 tur
97. titled to make one copy of all or parts of the License Material as is necessary for the use according to this Agreement namely for hackup purposes The Customer shall apply the copyright of Studer found on the License Material onto all copies made by him Records shall be kept by the Customer regarding the amount of copies made and their place of keeping The responsibility for the original program and all copies made lies with the Customer Studer is entitled to check these records on first request Copies not needed anymore have to be destroyed immedi ately The License Material is a business secret of Studer The Customer shall not hand out or in any way give access to parts or the complete License Mate rial to third parties nor to publish any part of the License Material without prior written consent of Studer The Customer shall protect the License Material and any copies made according to the paragraph above by appro priate defense measures against unauthorized access This obligation of non disclosure is a perpetual obligation Third parties are entitled to have access to the License Material if they use the License Material at the Customer s site in compliance with this Agree ment Under no circumstance are third parties entitled to have access to the in stallation software on the original data media The Customer shall safe guard the original data media accordingly The rights granted to the Customer according to this License Agreem
98. ubject to change without notice transformer balanced electronically balanced 20 Vpp 00 2 5 dB 65 Hz 18 kHz 196 50 Hz 20 kHz lt 1 2 48 Hz 20 kHz lt 1 75 15 kHz 90 x 90 H x V 100 x 100 H x V 2 way Midrange ext diaphragm 0142 0102 Input connector 1 x XLR 3f Netweight o 2 1 p p 95kg Mans 1 0 Bovo 0 0 Date printed 29 02 00 General E2 3 STUDER A Series Active Monitor Speakers 3 OPERATION 3 1 Connectors controls A5 8 JMEN INPUT 1 CHASSIS f 25 IN PHASE 6 3 OPPOSITE PHASE SENS 775 mV 100 dB CAL POSITION OF LEVEL CONTROL 5 ROLL OFF 4 CAL 4 X LEVEL 7 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR ACHTUNG GEFAHR ELEKTRISCHER SCHLAG NICHT OFFNEN POWER 3 2 DO NOT COVER REAR PANEL MAINS VOLTAGE SELECTOR NE PAS COUVRIR L ARRIERE lI acl C ees FUSE 115 V T3 15 A slow blow 115 230 V 50 60 Hz 230 V T1 6 A slow blow 200 VA REPLACE WITH SAME TYPE FUSE 1 Date printed 29 02 00 Operation E3 1 A Series Active Monitor Speakers A3 3 2 1 1 E3 2 Operation INPUT 1 4 CHASSIS 2 IN PHASE 3 OP PHASE SENS 775 mV 100 dB CAL POS
99. used Polyester 7 5 mm 1 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V Polyester 7 5 mm 2 2 nF 630 V 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1N4935 fast recovery 1 4935 fast recovery 14935 fast recovery 2 18V 2 03 Z 18 V BZX85C Z 27 V BZX85C Z 27 V SECTION 5 A Series Active Monitor Speakers STUDER A5 Parts List Ref Value Ref Value Ref Value J1 Flat pin 2 8 mm R1 10k 0 5 W R192 1k 0 5 W2 J2 Flat pin 2 8 mm R2 10k 0 5 W R193 10k 0 5W J3 Flat pin 2 8 mm R3 not used R194 100k 0 5 W 5 Flat pin 2 0 mm R4 47K 10 5 W R204 AKT 105 W J6 Flat pin 28 mm R5 100k 0 5 W R206 3k9 0 5 W J7 Flat pin 2 8 mm R6 not used R213 12k 0 5 W J8 Flat pin 2 8 mm R7 5k6 0 5 W R218 10k 0 5W R9 1k 05W R241 4k7 10 5 W JG1 Flat pin 2 8 mm R11 5600 2 W R242 22k 0 5 W JG2 Flat pin 2 8 mm R12 5600 2 W R246 33k 0 5 W JG3 Flat pin 2 8 mm R13 5600 2 W R247 00247 2W R14 560Q 2 W R249 3k3 0 5 W Jt11 Flat pin 4 8 mm R21 1k 05W R270 220k 0 5 W Jt12 Flat pin 4 8 mm R22 1k 0 5 W R271 1k 0 5 W Jt13 Flat pin 4 8 mm R23 1k 0 5 W R272 1k 0 5W

Studer A Series - Harman Professional

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