BU-150
Contents
1. Infinity BU 150 Powered Subwoofer SERVICE MANUAL Infinity Systems Inc 250 Crossways Park Drive Woodbury N Y 11797 1 800 553 3332 H AHarman International Company Rev A 3 2000 Amplifier Subwoofer Volnfinity BU 150 SAFETY INFORMATION Warning Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock Therefore any service procedures are to be performed by qualified service personal ONLY Caution This unit does not have a power switch Hazardous voltages are present within the unit whenever it is plugged in Before the amplifier is plugged in be sure its rated voltage corresponds to the voltage of the AC power source to be used Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in Do not exceed rated voltage by more than 10 operation below 90 of rated voltage will cause poor performance or may shut the unit off List of Safety Components Requiring Exact Replacements F1 Fuse SLO BLO 1 5A 250V 20mm UL approved PWRCORD SPT 2 or better with polarized plug UL approved wired with the hot side to fused side Use with factory replacement panel strain relief only T1 Transformer Use only factory replacement DBR Bridge diode Use only factory replacem2. e o o o T0 SATELLITE e SPEAKER AMPLIFIER SUBWOOFER PLATE Amplifier Subwoofer infinity BU 150 When using a single subwoofer you MUST use a pair of stereo low level leads from your preamplifier s outputs When using two subwoofers one for the left and another for the right channels connect the left preamplifier output to BOTH the left and right LOW LEVEL INPUTS of the subwoofer used for the left channel by using a Female to Male Y connector at the subwoofer s output Connect the right channel preamplifier output to both jacks of the right channel subwoofer in the same manner See Figure 3 If the preamplifier has a mono subwoofer output you ll also need a Male to Female Y connector to split the mono signal to the subwoofer pair See Figure 3 OUTPUTS Preamp with one Figu re 3 6 R set of outputs Preamp with mono subwoofer output SUB OUT OR Male to Female Y Connector Zeeeeeeeeee To Left SE To Right asi MA AA e ANS LEFT Ms J ya ee P s noe d Jum sem R N RIGHT 2 LEFT Female to Male gt SUBWOOFER Y Connector RIGHT SC GE n S PLATE Ibm op Ge Figure 3 Use this method when using single subwoofer or two subwoofers The subwoofer may be connected to your system using the AMPLIFIER HIGH LEVEL INPUTS
3. 2 BU 150 AMPLIFIER ASSEMBLY EXPLODED VIEW 15 ENERAL SPECIFICATIONS BU 150 PCB Version 3 52 Component Side Trace 16 DETAILED SPECIFICATIONS e 4 BU 150 PCB Version 3 52 Solder Side Trace 17 CONTROLS AND THEIR FUNCTION ee 6 BU 150 PCB Version 3 53 Component Side Trace 18 BU 150 CONNECTIONS AAA 7 BU 150 PCB Version 3 53 Solder Side Trace 19 OPERAT ON 1 reete trt iiir 11 BU 150 ELECTRICAL PARTS LIST 20 BU 150 TEST SET UP AND PROCEDURE 12 BU 150 INTEGRATED CIRCUIT DIAGRAMS 21 BU 150 POWER AMP MODULE TESTING BU 150 SCHEMATIC 1 of 2 sese 22 FEOW CHART itonitex tatit gti ntes 18 BU 150 SCHEMATIC 2 of 2 23 BU 150 PACKING amp CABINET ASSEMBLY 14 GENERAL SPECIFICATIONS Frequency Response 3dB 28Hz 150Hz Output RMS 200W REENEN 15 Woofer Crossover Frequency 50Hz 150Hz continuously variable Dimensions Hx Wxvf naana 178 x 17 x 17 4 451 x 451 x 451mm Add 14 4 5cm for feet Weight 3 0 0 oser ke eee dE Rx AR LLa ESAE 55 Ibs 20 kg Refinements may be made on occasion to existing products without notice but will always meet or exceed original specifications unless otherwise stated Amplifier Subwoofer infinity BU 150 DETAILED SPECIFICATIONS LINE VOLTAGE
4. 4 on the plate located on the rear OUTPUTS panel of the subwoofer Use speaker wire maintaining proper polarity to and to Attach the speaker wire to pai Ea the left and right HIGH LEVEL INPUTS on the subwoofer 3 and the other ends to the proper left and right OUTPUTS on your amplifier or receiver See Figure 4 If you plan to use two subwoofers one for the left and the other for the right channel connect wires from the left and right OUTPUT on your power amplifier or receiver and attach the other ends to the corresponding HIGH LEVEL INPUTS on each subwoofer Observe polarity See Figure 6 Figure 4 Use this method when using a single subwoofer Seo eo L Low Level In Crossover Frequency Power O Or 7 O SUBWOOFER PLATE Amplifier Subwoofer Volnfinity BU 150 Figure 5 Use this method when using two subwoofers Figure 6 Use this method when connecting one subwoofer to satellites Depending on whether you are using one or two subwoofers connecting your satellites can be accomplished in one of two ways If you are using a single subwoofer with a pair of satellites connect them as shown in Figure 7 AMPLIFIER OUTPUTS LEFT RIGHT SE Figure 5 SUBWOOFER PLATE SUBWOOFER PLATE AMPLIFIER OUTPUTS EE Figure 6 SUBWOOFER PLATE 9 Rear View Rear View L SATELLITE R SATELLITE Amplifi
5. Resistance check between V V and O P O P to GND should gt 5K Replace Module Yes Power up with no signal I P LED RED Check fuse transformer CMC rectifier C1 C2 Check I P of module to GND OV D C Check C29 and Pre AMP Yes Check switching frequency 100KHz 10 1Vpp Yes Power AMP OK END Check V V 15V voltage to module Check transformer CMC rectifier C1 C2 D9 D10 R16 R17 Check 6V to module measure to V Check D6 R9 R46 Check S D voltage to module 5V measure to V Check DI R1 Q3 04 Q5 and SCP Check O P to module for 80Vpp square wave measure to Check L1 L2 L3 L4 C6 C24 13 Amplifier Subwoofer FEET PART Set of 4 200310 200870 41 e SCREWS 8 T TRIM RING 200401 15 WOOFER 200400 CABINET NOT FOR SALE SCREWS 10 AMPLIFIER FOOT BASE Each e S BU 150 PACKING amp CABINET ASSEMBLY SCREWS 4 D B B8 Ir aad ASSEMBLY FEET PAD 4 STICKERS 200252 am WARRANTY CARD 333715 001 OWNER S MANUAL 200230 BU 150 PACKING CARTON 200420 infinity BU 150 BU 150 CABINET ASSEMBLY TOP STYROFOAM COVER PAD 200465 um Wo STYROFOAM RAIL PADS 2 per carton 200460 BU 150 SUBWOOFER PLASTIC BAG BOTTOM STYROFOAM RAIL PADS 2 per carton 200470 BOTTOM STYROFOAM CENT
6. Version 3 53 Solder Side Trace o esf feo n o o o n Mbo m ix olo ejoa neier aje EN e N O co ala dmm kola Lo n leo WI dalade ei aS NINI EE so ee ea ICT Wd Cer gt 2 ele WI D N o R53 R54 R55 R56 BEU 3 53 R42 R43 FANCY o LO I ml bap Sec RCA CONNECTOR AMI 1998 A aa Zi S S z LOPASS a Lo lan m ma b WO Ole LEDi 23 DI ez O Bn o OQ D Be T gen CH 2 O Be T CH D gt GA AS da eb gt AS D O AS LL D KS o D KS O 0D L ist Lo C c 2 o o gt TI m 19 Amplifier Subwoofer VoInfinty BU 150 BU 150 ELECTRICAL PARTS LIST REF PART DESCRIPTION QTY REF PART DESCRIPTION QTY BU 150 PCB REV 3 5 C3 30514 47nF 50V 80 20 Mono ceramic axial 1 C4 5 30504 100nF 50V 80 20 Mono cer rad 0 2 1 Resistors lax 0 3 Ri 40702 6 8M 1 AW 5 carbon film 1 C6 30709 4 7uF 100V 80 20 Electrolytic Radial 1 R2 40466 8 66k 1 4W 1 metal film 1 Needy part R3 40458 432k 1 4W 194 metal film 4 C7 30510 33n 50V 10 Mono ceramic axial 1 Bd eer MAC AW itor cantant C7alb 30505 100n 100V 20 Metal Polyester Rad 2 C8 9 30504 100nF 50V 80 20 Mono ceramic radial 1 SE T eee Ng Ci 30702 100uF 35V 80 20 Electrolytic Radial 1 mm 40320 ie AW S7 carbon fiM C13 30507 10nF 50V 20 Mono ceramic axial 1 ne 40420 UEM E5 carbon Mm CH 30511 330nF 50V 10 Mono cera
7. gt D O D XI LL D LU c D c O Q E o O RCA CONNECTOR AMI 1998 LOPASS Version 3 52 m Amplifier Subwoofer oInfinity BU 150 BU 150 PCB Version 3 52 Solder Side Trace dL 6 3 H EEN S 2 ES CO aA Ol 3 st t C0 SE 9s Lae aa N e N d lol Ip o ho Lol Rs gie WINS aye a4 op 29 O mm fom a4 e 5 cv eee g N R53 R54 R55 R56 2 Do R14 REU 3 52 5 9 e Sp IN LO NR XE JEER gs 5 ES Njo a d aj OO oj EVE FANCY RCA CONNECTOR AMI 1998 3 e LOPRSS Kei Lu O Bel D Be T Be O 2 O Bn Be T2 CH D D Ka v Lu D gt t D o D Be H D je OU Bn D D O OU L CN Lo C3 c S o D gt ma 10d SSUd H Amplifier Subwoofer VoInfinty BU 150 BU 150 PCB Version 3 53 Component Side Trace o esf feo e eo o o n rha N leche neies ler lad tad EN e N O olol jaala mm ho x Lo n leo eo seme eu aS NI e E ee eo Lace e c oer cr o lee R46 R53 R54 R55 R56 BEU 3 53 R42 R43 FANCY Be D gt D O D Be LL o c ab c o Q O O RCA CONNECTOR m n c e PER C 24 gt 3 6 AMI 1998 lal lao Keess li Lk Oyj joje fan m ice Version 3 53 a LO I Lo Oke LEDI EZ D2 Eee 18 Amplifier Subwoofer Vinny BU 150 BU 150 PCB
8. 1 C1 30710 2200uF 100V 80 20 Electrolytic Radial 1 L3 80122 Ferrite bead 1 Safety part L4 80122 Ferrite bead 1 C2 30710 2200uF 100V 80 20 Electrolytic Radial 1 Safety part 20 Amplifier Subwoofer 46V V O P 15V SD FR VP GND 15V Q4 5 MPS A56 15 16 17 18 19 20 21 22 23 24 25 26 27 28 U1 LM324 Quad Op Amp OUT 4 Wlnfinity BU 150 BU 150 INTEGRATED CIRCUIT DIAGRAMS 1 2 3 4 5 6 les 8 9 10 Ja 12 18 14 N4 S53AMI S64AMI Power Amp module SAFETY PART 6V NOTE THE FOLLOWING PROCEDURES MUST BE FOLLOWED WHEN INSTALLING NEW S53AMI S64AMI AMP MODULES FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN VE POWERED UP 1 Align white indent marker on Amp Module with indent marker on main O P PCB alternately observe position of label on the top of the module incorrectly replacing the Module 180 in the PCB slot will result in its destruction V 2 All AC powered test instruments meters oscilloscopes etc must have a floating ground i e be connected to an isolation transformer 3 Align and position the Amp Module before soldering 415V 4 Attach the amp Module with the mounting screws before soldering or powering up SD 5 Use only rosin core or non acid core solder thoroughly de flux the surfaces after soldering FR I P If the new S53AMI
9. ER PAD 200475 14 Amplifier Subwoofer Wlnfinity BU 150 BU 150 AMPLIFIER ASSEMBLY EXPLODED VIEW C D E O D 50 150 Phass 9 Power 09 1809 i h i amp 3 l Level i H fi i Min Mar een eg sn nn Rei 3 70317 Face Plate Aluminum SAFETY PART 70318 PCB Support SAFETY PART HE 70170 4x0 5 Screws to secure input jacks 70171 10 x 1 machine screw Bolts 70172 10 Keps Nut 70173 6x0 5 Screws for fuse PCB 80124 Transformer MCI4700 SAFETY PART 10 80123 250V 1 5A T type SLO BLO Fuse SAFETY PART 11 80112 Motherboard SAFETY PART EN 2 5 7 ceo e nens ma Dual RCA ones s Pur Oord Stain Reef SAFETY T 0105 Power cord 2 conductor SAFETY PART 1 c lt CO A ce wo BU 150 Amplifier Assembly Exploded View 15 Amplifier Subwoofer oInfinty BU 150 BU 150 PCB Version 3 52 Component Side Trace d I 3 1 H engen SREB P co aE CO a d E CO E ban OO e e NI Wi clol iler telo ho sm o In oo clio SS Sn eu Gd Iiei Ee GOS le ad aa f 24 W I mm fam md o gt c c m m oper R53 R54 R55 R56 REU 3 92 FANCY Ia Sr IN LO BEER D a E ys G E lo HE ES CO Or e mM ke em ei Ei es ea GE O c DIODE BRID m D
10. S64AMI Amp Module has larger mounting hole s in the case and the stock screws no longer will fit and screws of the GND proper type cannot be obtained locally order 2 partit 603018 screws SEI 2 p screws 2 part 60301N nuts DND N3 IN3 OUT 1 80V PNP Transistor NS H 3 Collector 2 Base 1 Emitter N1 V IN2 N Q2 2N3906 40V PNP Transistor E 3 Collector 2 Base 1 Emitter U2 TLO 82 Dual Op Amp A OUTPUT A INPUT A INPUT Q3 2N3904 40V NPN Transistor 3 Collector 1 Emitter V B OUTPUT B INPUT B INPUT Q1 MPS A13 30V NPN Darl Transistor ES 3 Collector 2 Base 1 2 1 Emitter 21 QoInfinity BU 150 Amplifier Subwoofer BU 150 SCHEMATIC 1 of 2 9 3 a 9 g V 64 EL A ELSA ASI pesniu ID AOLE 8H PC CNC 8H ZY Lor ze 6 c Jo 9g9eueu s OSGL NG A SC Ps P443 Xa p ONS zeta HOH 8 NOT dN A0S DECH uer ka dN os 10002 vio Jnooz 107H 18 919 Al X uos dwy 4d LED OL 9 0s gou HAI lee ION mW Saad Jer i58 10H bey EGH 1NH ASI DIEL app ge pejejos Apog see aes vue S See b geg CH u00 nce E 9 619 u89 one Ob mp gong on Bus SS KS ii go eeu Sp SA la Pa ei _ ITI UQOL d H VC uoot 9948 v Ne SE ms ozo E Leu mu on 9 3 a 9 g V 22 Volnfin
11. Seege mV peak 2v pp Speaker Outputs AC Line cycled from OFF to ON Turn off Transient mV peak Speaker Outputs AC Line cycled from ON to OFF L Efficiency p i Stand by Input Power 20 Watts Input Line voltage 120 VAC voltage power voltage 2 54 55 Relative to rated output Line In L amp R EE uu EEN ee e e o A Ee functional Direct short at Short Circuit Protection YES Thermal Protection YES C output k functional 01 8 max Power transformer 85 deg C ck unclipped Power Amps 2 SloBlo type 0 Line Fuse Rating Amplifier Subwoofer Vinny BU 150 CONTROLS AND THEIR FUNCTION 1 High Level input and Output terminals 2 Low Level Input Jacks connect to preamplifier outputs 3 Low Pass This is the crossover frequency control which determines the upper corner roll off points 4 Power On indicator 5 Phase 0 180 switch to change audio signal polarity 6 Level This controls the volume level of the subwoofer o oo Line Input ny U Technology e B U 1 50 Powered Subwoofer 120V CAUTION n ul eT O 250W TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE e Amplifier Subwoofer BU 150 When connecting your subwoofer make sure you turn all the power off There are several ways to connect your subwoofer Read this section carefully to determine which method is best suit
12. Yes Hi Lo Line Nom Unit Notes US 120vac 60Hz Yes 108 132 120 Vrms Normal Operation Test Conditions Limits Parameter Amp Section Type Class AB D other Load Impedance speaker Rated Output Power Class D Preferred Sink required for Class AB Watts Input voltage 120 VAC 60 Hz 2 22k filter 120W Power Bandwidth 30 100Hz 120 VAC 5 22k filter F KE i gt a THD 1 Watt DC Offset Damping factor A N eo i V DC Speaker Outputs V CO o EE Measured across amplifier outputs PEE DLE 2dB To Rated Power 1 input driven AP source Z Vol Max 600 ohms rms To Rated Power 1 input driven AP source Z Vol Max 25 ohms pce LEN Relative to rated A Weighting filter output p Relative to rated 22k filter output ER relative to 1W 22k filter Output Volume max using RMS reading DMM VOM or A P BW lt 20KHz 5 mVrms max 2 Volume max w A P Swept Bandpass Measurement Line freg harmonics BW 20Khz Input Sensitivit Input Frequenc Line Input CA Wu Vrms Speaker Hi Level Input 7 Signal to Noise SNR A Weighted SNR unweighted N o Wu SNR rel 1W unweighted 65 22k Residual Noise Floor Vrms o on o Residual Noise Floor Input Impedance Line Input Speaker Hi Level Input ee EE OK Nominal o 5K L E ohms ohms Nominal OdBr 1w 50Hz N N Wu e e 3 N N lt D z D Low Pass fiked or variabl
13. e Low Pass filter point or range Slope c o 1 2dB 3dB Point COD oo dB Ocave Ins na n Damping n dB Ocave Wa va PRENNE Subsonic filter HPF Slope n a n a 1 0 3 gt 50 70 55 3 n a n a a a a a Damping n eja No NO Cc D Amplifier Subwoofer infinity BU 150 es po THD at Max Output functional Maximum Output Maximum THD as a result of Power Power limiting Se E Phase Switch yes no YE functional o v 45 deg additional phase shift switch op OK Volume pot Taper LOG lin log SEET Input Configuration L C C C C r functional Enabled w Line Spkr ck Input Select Switch k k k k k functional 8 ohm Satellite 6dB oct passive xover 200 Uf cap Non ck polarized 8 2 Spkr Hi Level In L amp R L R Spkr Out Hi Pass Filter 100 EE EE EE Signal Present LED Yes RS o0 35Hz into Line Zo 600 Ohms Input w 1 ch Driven 35Hz into Speaker Input w 1 ch Driven L Signal Present Input 3 Ecg Freg EE Amp connected and AC on then input signal applied 3 KE Signal Present Speaker 2 6 i Signal Present Level line 30 in Signal Present Turn on time se T before muting after signal is Auto Mute Turn OFF 3 Time Power on Delay time removed aaa AC Power Applied C C se 3 uu EE Transients Pops KH Signal Present Transient 5 mV peak n a Speaker Outputs
14. ed for your installation The subwoofer may be fed directly with a low level signal taken from a preamplifiers output by using the second set of output jacks on the rear of the preamplifier See Figure 1 If a preamplifier has only one set of outputs you may use two 2 Y connectors See Figure 2 to connect the subwoofer Use standard shielded leads terminated at each end with male RCA connectors Connect one end of each stereo pair of leads to the preamplifier s left and right outputs and connect the other end to the corresponding left and right LOW LEVEL INPUTS 1 on the subwoofer If you are using a tube preamplifier and the connecting leads will be longer than 10 feet 3 meters we recommend not using the above connection method A tube preamplifier may not be able to handle the capacitance introduced by leads more than 10 feet in length Instead try using the high level connection methods listed on pages 5 7 Figure 1 A low level signal can be used from a preamp s output by connecting second set of output jacks to the rear of your amplifier Figure 2 You can use this method 2 Y connectors if your preamp has only one set of outputs Volnfinty BU 150 CONNECTIONS OUTPUTS Figure 1 LO OR 0000000000000000 TO SATELLITE Preamp with two sets of outputs SUBWOOFER PLATE Preamp with one set of outputs OUTPUTS Figure 2 Y Connector ae
15. ent C1 2 2200uF 100V electrolytic filter caps Be sure replacement part is at least the same working voltage and capacitance rating Also the lead spacing is important Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration C6 4 7uF 100V electrolytic radial S64AMI Power output module Use only factory replacement Faceplate Faceplate Use only factory replacement Air leak cover Use only factory replacement CMC1 Use only factory replacement L1 Use only factory replacement Fuse PCB Use only factory replacement Main PCB Use only factory replacement Leakage Resistance Check Before returning the unit to the customer perform a leakage or resistance test as follows Leakage Current Note there is no power switch on this unit When the power plug is plugged in the unit is live Connect the unit to its rated power source Using an ammeter measure the current between the neutral side of the AC supply and chassis ground of the unit under test if leakage current exceeds 0 5mA the unit is defective Reverse the polarity of the AC supply and repeat Resistance Measure the resistance from either side of the line cord to chassis ground If it is less than 500k ohms the unit is defective WARNING DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected Amplifier Subwoofer infinity BU 150 TABLE OF CONTENTS SAFETY INFORMATION
16. er Subwoofer Figure 7 Use this method when connecting two subwoofers to satellites If you are using two subwoofers as a stereo pair with a pair of satellites connect them as shown in Figure 7 The subwoofer has a variable freguency control that can be used to block unwanted frequencies between 50 150Hz from being reproduced by the subwoofer When you set this control depends on the low frequency capabilities of your satellite speakers Adjust this knob to the lowest frequency that you satellite speakers were designed to reproduce refer to Operation step 7 LEFT RIGHT SUBWOOFER f SUBWOOFER PLATE PLATE Wlnfinity BU 150 AMPLIFIER OUTPUTS Fae ER Figure 7 Rear View Rear View L SATELLITE R SATELLITE 10 Amplifier Subwoofer Wlnfinity BU 150 OPERATION Setting the Controls 1 Initially set the subwoofer s Volume control to the minimum position 2 Initially set the subwoofer s Crossover Frequency control to 12 o clock 3 Set the subwoofer s Phase switch to the NOM position Turn the Power On 4 Turn on the entire audio system and play any music Source 5 Turn the Volume control to its mid position If no sound emanates from the subwoofer check the AC line cord and input cables Are the connectors on the cables making proper contact Is the AC plug connected to a live receptacle Adjusting the Volume 6 Set the overall volume control of the
17. film 1 Di 50111 ZENER 1N4763A 91V 5 1W 1 R35 40422 301k 1 4W 1 metal film 1 LED 1 or 2 50106 Dual Cir LED 2 legged R36 40446 8 66k 1 4W 1 metal film 1 D2 4 50104 1N4148 100V 0 1A 2 R37 40446 8 66k 1 4W 1 metal film 1 D3 50102 ZENER 1N4749A 24V 5 1W 1 R39 40467 30 1k 1 4W 1 metal film 1 D6 50103 ZENER 1N5234B 6 2V 5 0 5W 1 R40 40417 47k 1 4W 1 carbon film 1 D9 10 50105 ZENER 1N4744A 15V 5 1W 2 R42 43 40406 100k 1 4W 1 carbon film 2 DBR 50100 Bridge Rect 200V 4A Safety part 1 R44 45 40409 10k 1 4W 5 carbon film 2 l R46 40104 A7 WAW 5 carbon film 1 Transistors R48 40468 7 32k 1 4W 1 metal film 1 Qt 60151 MPS A13 30V NPN Darl 1 Rag 40415 470k 1 4W 5 carbon film 1 Q2 60152 2N3906 40V PNP 2N4402 alternate 1 R50 40100 832 AW 5 carbon film 1 Q3 60153 2N3904 40V NPN 2N4401 alternate 1 R51 40417 47k 1 4W 5 carbon film 1 04 5 Eius SSD SOV PNF R52 40456 2 7k BW 5 wirewound Safety part 1 R53 54 55 56 40106 100 29 5 carbon film 4 Integrated Circuits R57 40456 2 7k BW 5 wirewound Safety part 1 U1 60100 LM324 Quad OpAmp 15V 1 R58 40469 5 49k 1 4W 1 metal film 1 U2 60101 TLO 82 Dual OpAmp 15V 1 R59 40405 4 7k 1 4W 5 carbon film 1 60302 S64AMI Power Amp module SAFETY PART R60 40443 39k 1 AW 5 carbon film 1 Crossover 40425 50k 1 4W 10 Double Log Pot 1 Inductors Level 40402 Bk 1 4W 10 Single Linear Pot 1 CMC1 80100 mc4438 Safety part 1 L1 80121 mc4642 Safety part 1 Capacitors L2 80122 Ferrite bead
18. ity BU 150 Amplifier Subwoofer BU 150 SCHEMATIC 2 of 2 6 D j q 9 g V D YE AO0c n d ch marde RUE DON EE See OOL noozz ADDL noozz e ME GC err ION E 29 e zoM asny jeuusu Bunjesoy seS pas ae 4A olgolS vol QS2 1U00L 3sn3 383d d0 904 Lsnrav H ONG 90 L AGE Jnzc ZO uL D 679 gECLzpSuougiEIeIc C Sty skara Dec HHS 9 O00 Q U Q S0d dS C Q B N dS IZEE S EEY sl 6v uk NOuO31ONd 9 MS Lg ise LINDYIO LHOHS Jeu ea A MS DIZ SPLPNL ge I s od vOGENZ AQ b3 SLOASSV INTIVA LEO Le m Av uooi o m Ory KCN OL 89 pa dWWaed OL INVP9S MEDE gy B NPOYY JoMOd c 40 c Ol JEWSYSS OSL Nd 9 j q 9 g V
19. mic axial 1 id 40449 3 3k 1 2W 5 carbon film C15 16 30707 220uF 50V 20 Electrolytic Radial 2 AB 20917 47k WAW 5 carbon film C17 30502 100nF 50V 80 20 Mono ceramic radial 1 R9 40464 9 1k 10W 5 power resistor Safety part 1 C18 30517 68nF 50V 10 Mono ceramic axial 1 HS 40409 JOK IEW 3 Carbon Mm cig 30524 82nF 50V 10 Mono ceramic axial 1 s 40406 100k 1 5 carbon film 1 C20 30504 100nF 50V 10 Mono ceramic axial 1 Rt6 17 40465 24k 7W 5 wirewound Safety part 2 C21 30522 100nF 250V 10 Polyester film 1 R18 40424 330k 1 4W 5 carbon film LED sens 1 C22 23 30502 100nF 50V 80 20 Mono ceramic axial 2 R19 40466 3 9k 2W 5 carbon film 1 C24 30523 330nF 100V 80 20 Mono ceramic axial 1 R20 40405 4 7k 1 4W 5 carbon film 1 C26 30508 10nF 50V 10 Mono ceramic axial 1 R21 40443 39k 1 4W 5 carbon film 1 C27 30513 3 3nF 50V 10 Mono ceramic axial 1 R22 40449 3 3k 1 2W 5 carbon film 1 C29 30711 22uF 35V 80 20 Electrolytic Radial 1 R23 40461 20k 1 2W 5 carbon film 1 Safety part R24 40418 22k 1 4W 5 carbon film 1 C31 30525 120nF 50V 10 Mono ceramic axial 1 R25 40417 47k 1 4W 5 carbon film 1 C33 30503 2 2nF 50V 20 Mono ceramic axial 1 R26 40701 1 0M 1 4W 5 carbon film 1 CW 30505 100nF 100V 20 Polyester film 1 R27 40440 6 81k WAW 1 metal film 1 CZ 30505 100nF 100V 20 Polyester film 1 R30 31 40441 13 7k 1 4W 1 metal film 2 R32 40415 470k 1 4W 5 carbon film 1 Diodes R33 40100 332 1 2W 5 carbon
20. one controls on your electronic components preamplifier receiver etc should be used with the utmost discretion Excessive boost can create severe power demands on your power amplifier Maximum bass boost can create a demand for literally hundreds of watts in the bass region whereas in the flat position or with the tone controls switched out of the system your average listening level may be impressively and realistically loud at less than 10 watts The remaining power capacity required is on reserve for power peaks on sharp transients and powerful crescendos 11 Amplifier Subwoofer Vinny BU 150 BU 150 TEST SET UP AND PROCEDURE AC VOLT METER 6V BU 150 UNDER TEST KI SPKR LINE LEVEL OUT CD PLAYER WI w A R ee Hi 3 ROM AMPLIFIER C4 L BEE FROM PRE AMP QU Line Input E SPEAKER LEVEL Low Pass Phase cS Power 09 1809 General Function UUT Unit Under Test 1 Connect both right and left line level inputs RCA to signal generator and UUT Use Y cable if necessary from mono source VOLUME control should be full counterclockwise Level Y Infir ny Digital Technology p B U 1 50 Powered Subwoofer 2 Turn on generator adjust to 50mV 50 Hz 3 Plug in UUT red LED should be ON Turn VOLUME control full clockwise Low Pass control should be set fully clockwise 150 4 LED should turn Green immediate bass
21. preamplifier or stereo to a comfortable level Adjust the subwoofer s Volume control until you obtain a pleasing blend of bass Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range Many users have a tendency to set the subwoofer volume too loud following the belief that a subwoofer is there to produce lots of bass This is not entirely true A subwoofer it there to enhance bass extending the response of the entire system So the bass can be felt as well as heard However overall balance must be maintained otherwise the music will not sound natural An experienced listener will set the volume of the subwoofer so its impact on bass response is always there but is never obtrusive The Crossover Frequency Controls 7 The Crossover Frequency control sets the high frequency roll off adjustable from 50 to 150Hz Where you set this control depends on the low frequency capabilities of your satellite speakers system placement and other factors affecting the mid bass region Turn the control UP clockwise until you feel there is too much mid bass information around 100Hz then back the control down a bit until that area sounds more natural To hear more low bass turn the Crossover Frequency control DOWN a bit and the Volume control UP by about the same amount This will increase low bass while leaving the mid bass sounding the same as it did before the adjustment To red
22. response should be heard and felt from port tube opening 5 Turn off generator turn VOLUME control fully counterclockwise CAUTION disconnect RCA cables ond A EE A 250W TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE 6 Connect one pair of speaker cables to either high level input terminal on UUT Cables should be connected to an integrated amplifier fed by the signal generator 7 Turn on generator and adjust so that speaker level output is 2 0V 50 Hz Turn VOLUME control full clockwise 8 Green LED should light immediate bass response should be heard and felt from the port tube opening e Sweep Function 1 Follow steps 1 4 above using a sweep generator as a signal source 2 Sweep generator from 20Hz to 300Hz Listen to the cabinet and drivers for any rattles clicks buzzes or any other noises If any unusual noises are heard remove driver and test Driver Function 1 Remove driver from cabinet detach and wire clips 2 Check DC resistance of driver it should be 6 4 ohms 3 Connect a pair of speaker cables to driver terminals Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5 0V 4 Sweep generator from 20Hz to 1kHz Listen to driver for any rubbing buzzing or other unusual noises 12 Amplifier Subwoofer Volnfinity BU 150 BU 150 POWER AMP MODULE TESTING FLOW CHART START
23. uce low bass without changing midbass turn the Crossover Frequency control UP and the Volume control DOWN Switch the Phase switch between NOM and REV positions while listening to music The selection that sounds the best is the correct adjustment for your system Room Placement 8 The room placement of the subwoofer is the most critical aspect of its installation It will be necessary for you to try various locations in your listening room before you choose the final location Some possible starting points include behind the right channel satellite speaker along the back wall between the satellites along a side wall but not too close to a corner or behind a couch or a chair In general the closer the subwoofer is to wall and corners the greater the effect of low frequency enhancement Experiment with the Crossover Frequency and Volume controls in different locations until you are pleased with the result you obtain from your particular application A Word of Advice The Low Frequency Roll off and Volume controls may be set anywhere within their rotation However it will be a most unusual circumstance if you have to set the Volume control completely clockwise This may indicate an unbalanced condition in your system too much bass or an especially large room or room placement may not be correct Try several other locations before concluding that the Volume control must be set at maximum A Word About Tone Controls The t
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