User Manual - SEEBURG acoustic line
Contents
1. mm Bag g Og m3 l9 gle ole SB ooloe Phase for ool o ooloe Phase for oolo OO 35 i Oo 25 OQ 35 OQ 2 5 891 me 881 Fs SB SEIEN O O 140 OO 0 O 10 O O 140 OO 0 OO 10 O OJ 180 OO 180 OO 13 O O 180 OO 180 OO 13 Low Phase A High A Atenuat Low Phase B High B Atenuat suoneunDyuo9o G zdS 10 Jeu 9joN Zt eui 2nsnooe ounga3as jenuey SG cdS eDeg SEEBURG acoustic line SP2 5 Manual 4 3 Factory Settings Page 14 If your SP2 5 was not ordered for a specific SEEBURG acoustic line system it will be delivered with the following standard preset Crossover Cutoff frequency SIP Phase HighMid and Woofer Attenuation HighMid 120 Hz 12 kQ EQ 1 Center frequency SIP 440 Hz 4 7 kQ Bandwidth Normal mid position Gain 0 dB mid position EQ 2 Center frequency SIP 2 kHz 4 7 kQ Bandwidth Normal mid position EQ 3 Center frequency 2500 Hz Q 1 fixed Limiter All limiters are set to transmit a power of 400W to a 8 Ohm transducer 4 4 Technical Specifications SP2 5 Signal To Noise Ratio 6 dB Total Harmonic Distortion THD 6 dB Maximum Input Level Headroom Subsonic Ultrasonicfilter Output impedance Signal to Amp Input impedance Audio In Mains Dimensions W x H x D Weight Equalizer function cut boost Range EQ EQ2 EQ3 gt 103 dB 0 04 96 22 dBU 3 dB points 35 Hz and 20 kHz 18 dB octave slopes2. p L P La cado dB eC With a known impedance a level can also refer to a voltage i U uh E dB A In our part of the audio world the reference voltage Uois 0 775V The reference power Po is defined at 1mW resulting in a voltage of 0 775 V over a 600 resistor SEEBURG acoustic line SP2 5 Manual Page 16 e Phase shift If two waves with the same frequency and same zero crossing overlay they are in phase they will add to a new wave with exact doubled amplitude fig 13a If these waves are shifted by 180 they will cancel each other fig 13b The time shift between two waves is called phase shift Depending on size of this phase shift there will be more or less amplification or cancellation This will also happen with two waves of different amplitudes it will then not result in total cancellation at 180 a Ay 2 Ay ahs fig 13 two waves same amplitude frequency and phase a add to a new wave with doubled amplitude e Q factor The Q factor or Q ist the width of the slope produced by a filter circuit Every EQ is a electronic filter resonant circuit A EO with a small O will alter neighbor freguencies of the cutoff frequency more than a EQ with a large O If you want to very perecisly alter one single frequency you will need a very high Q Sometimes you ll want to effect a broader band i e lower band of a complete P A system 50 to 150 Hz in that case you need a filter with a low O For you slope freaks out th
3. A i li d SN Ma 900 1k k 5k 10k 20k fig 10 the three mesured filter slopes 3 4 2 Bass boost Pressing the bass boost switch on the front panel activates a 6dB boost 55Hz The corresponding LED indicates active boost SEEBURG acoustic line SP2 5 Manual 4 Appendix 4 1 Tables resistor frequency frequency frequency array X 0Ver EO1 EO2 220 11K 330 4K7 2K1 9K2 390 3K8 2K 9K 470 3K2 1K8 8K3 560 2K7 1K7 7K9 680 2K3 1K6 7K1 820 1K8 1K5 6K7 1K 1K5 1K3 6K 1K2 1K3 1K2 5K3 1K5 1K 1K1 4K7 1K8 820 920 4K1 2K2 680 800 3K7 2K7 550 700 3K1 3K3 450 600 2K8 3K9 380 510 2K3 4K7 315 440 2K 5K6 270 380 1K7 6K8 220 320 1K45 8K2 175 270 1K25 10K 145 225 1K 12K 120 185 850 15K 92 150 700 18K 78 130 580 22K 60 110 490 table 1 SIP resistor values for setting cutoff frequencies and EQs resistor values in Ohm Q frequency in Hertz Hz These values noted in three numbers The first and second show the resitor value the third shows the numbers of zeros to be added Example 222 22002 2 2 kQ 153 150000 15 kQ SEEBURG acoustic line SP2 5 Manual Page 12 S2 S3 S4 85 OFF LOFF OFF OFF OFF 2 5 9 18 i 36 i Te OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF amp iR 5 i8 iS iB 52 8 ON 999939299359 99999999999 table 2 DIP switch settings for limiter levels U in Volt P16 inW
4. to exactly measure the amount of power fed to the speaker drivers This measurement with internal sensing is a must for acurate limiter operation see fig 1 Time related limiter settings are made via blue jumpers in the limiter section of the circutboard The jumper sockets are labeld fast A medium B and slow C Time settings for bass amp high mid are Bass A 20ms B 100ms C 200ms HighMid A 10ms B 40 ms C 100ms The maximal power values for each limiter are set with four 5 way DIP switches Positions for power and impedance are listed in table 2 in the appendix Red LEDs on the front panel indicate limiter action The SP2 5 limiter has a dynamic characteristic which means the power is not totally limited immediately when threshold is reached the compression ratio rises as amp power does fig 6 Output Input fig 6 principle limiter charactertistic The LED will light at point A The compression ratio then rises as input signal does range between point A amp point B The maximum compression ratio of approximately 1 20 is reached after the input signal reaches point B 3 3 Subsonic and ultrasonic filter The subsonic filter is a highpass filter with an edge steepness of 18 dB oct the ultrasonic filter a lowpass with the same edge steepness The 3dB cutoff frequency are at 35Hz and 20kHz The idea is to damp frequencies outside of the relevant audible range infra and ultrasonic These filters a
5. 600 Q 40 kQ 230 Volt AC 10 VA 482 x 440 x 230 mm 3 4 kg 12 dB 110 2100 Hz 490 11000 Hz 2500 Hz Q 1 In keeping with our policy of continued improvement SEEBURG acoustic line reserves the right to alter specifications without prior notice SEEBURG acoustic line SP2 5 Manual Page 15 4 5 Glossary compression ratio A compressor limits the level of an audio signal as soon as it exceeds a certain adjustable value threshold Below the threshold the slope is 1 a ratio of 1 1 which means output value is equal to input value At the threshold the characteristic changes to a less steep slope depending on the compression ratio COMPRESSION RATIO determines the ratio of change on output signal to changes in input level for all signals that exceed the threshold A limiter has a compression ratio of 1 ee meaning no increase of output level no matter how much the input level increases after exceeding the threshold level ons 1 1 keine Kompr dB 1 2 1 4 1 8 Threshold 4 1 00 Begrenzung Input dB fig 12 compression ratio e Level Dezibel dB In audio we have a to care a lot about levels A level can mean a voltage or power and often a sound pressure in relation to a reference voltage reference power or reference sound pressure This scale used is logarithmetic and the unit used is Bel for matters of size mostly used is dezi Bel or short dB For power level the definition is
6. 8 49 06 AJ fig 8 mesuered frequency curves EQ1 Q 12 SEEBURG acoustic line SP2 5 Manual Page 9 Digital Audio Analysis System Signal level 3 7 dBV 3 15 20 30 5 100 200 300 500 1k 2k 3k 5k 10k 20k Hz ielay compensation acoustic no Test Signal PN6192 mi e2o0v in2 gt 443Pa Out odB kHz 48 DUT NoName S 0000 03 01 97 19 20 13 4 fig 9 mesuered frequency curves EQ2 Q 12 fig 8 and fig 9 show a decrease of the zero lines under 50Hz and obove 15kHz This effect results of the SP2 5 s built in subsonic and ultrasonic filters see 3 3 3 4 1 Adjusting the EQ slope Q factor The slope of the EQ filter Q Faktor 3 can be adjusted by setting the yellow jumper on the circuit board the socket ist marked bandwidth The three available types fig 10 are e Peak Q 12 yellow jumper left position Normal Q 3 yellow jumper middle position e Shelve Q 1 5 yellow jumper right position The fourth position far right can be used for further optional slopes to be custom designed Resistor R26 and or R46 must be soldered Please contact your SEEBURG acoustic line service see glossary appendix SEEBURG acoustic line SP2 5 Manual Page 10 SP2 Filtercharakteristik EQ 2 2 2KOhm f 525 Hz Peak Normal Shelve 100 PS NE es acoustic line I
7. SEEBURG acoustic line active systempanel 2 5 User Manual Oktober 2003 acoustic line SEEBURG Prot fessional PA Systems TABLE OF CONTENT 1 INTRODUCTION 1 1 Using This Manual 2 CONTROLS AND CONNECTIONS 3 THE SP2 5 FUNCTIONS 3 1 Active Crossover 3 1 1 Setting the crossover frequency 3 1 2 Phase correction 3 1 3 High Mid attenuation 3 1 4 Fullrange mode 3 2 Limiter 3 3 Subsonic and Ultrasonic Filter 3 4 Equalizer 3 4 1 Setting the Filterwidth 3 4 2 Bassboost 4 APPENDIX 4 1 Tabels 4 2 Note Chart for SP2 5 Configurations 4 3 Factory Settings 4 4 Technical Specifications SP2 5 4 5 Glossary O CO N o 11 12 13 13 14 SEEBURG acoustic line SP2 5 User Manual Page 1 1 Introduction Congratulations With the SEEBURG acoustic line SP2 5 you have purchased a versatile and professional controller for touring and installed applications It s flexible possibilities make the SP2 5 suitable and compatable for existing PA Systems Operating in analog technology it uses only highest grade components and garantees a very natural and first class sound reproduction Please read this manual carefully to allow your system to achieve it s full potential Keep this manual for further reference The SP2 5 is used as a link between amplifiers and loudspeakers Fig 1 It combines an active 2 way stereo crossover system Controller and a I O connection panel in a standard 19 housing using only one
8. ass A B Connectors for connecting the outputs of the SP2 5 to the corresponding amplifier inputs Sub out mono This connector carries a additional bass mono signal which can be adjusted in phase amp level using the controls PHASE amp LEVEL Page 4 SP2 5 Manual SEEBURG acoustic line 05 6570 e From DHngaas 40Jjo3u02 wass Bojeuy aul o2psnooe B somes evra men moon ien FWY eu o2psnooe sopen indui LL NET e 4ojjonuo3 uejsAs Bojeuy Gz dS PH StH fig 3 Rear panel connectors and controls fig 2 Front panel connectors and controls SEEBURG acoustic line SP2 5 Manual Page 5 3 SP2 5 Functions 3 1 Active Crossover The integrated 2 way crossover divides the audio spectrum into passbands for each transducer and distributes the preamplified signal from the mixer to the corresponding amp channels for bass mid amp high frequencies The crossover frequencies are set using risistor arrays SIPs The bass band is limited by an highpass filter the hi mid band is limited by an lowpass Filter both typs are Butterworth with 24dB octave slopes The following parameters can be edited 3 1 1 Cutoff frequency By using different resistor values SIPs the crossovers cutoff frequencies can be set also allowing the bands to overlap The resistor values are listed in the appendix in table 1 3 1 2 Phase correction Difference in phase between the two bands can be adjusted by altering
9. attat 16 O impedance P8 in Watt at 8 O impedance P4 in Watt at 4 O impedance P2 in Watt at 2 O impedance sBumes 1e ojuoo eA iyoue 0 ueuo ejou LL BY Gain EO1 12dB 0000 0000 Channel A Gain EQ2 12dB Valid 100 2200Hz OOOO Valid 480 11000 Hz 00000000 0000 00000000 Bandwith EO1 Centerfreguency Bandwith EO2 Centerfreguency 1 On 1 On 1 Onl 1 Onl 2 On FadOO 2 On Fad OO 2 On Fasloo 2 On FaslOO 3L_On Medium OO 3L_ On Medium OO 3L_ On Medium OO 3L_ On Medium OO 4L_ On Sow OO 4L_ On Sow OO 4L Onr Sow oo 4L On Sow oO 5 On AtacKFelease 5 On AttacKFelease 5L_ Onl AttackFelease 5L_ On Attack Release for Limiter for Limiter for Limiter for limiter reshold Treshold Teshold Teshold High A low A Hgh B Low B Channel B Gain EO1 Gain EO2 12dB 12dB OOOO Valid 100 2200Hz OOOO Valid 480 11000 Hz 0000 OOOO0000 0000 O0000000O Bandwith EO1 Centerfrequency Bandwith EO2 Centerfreguency Channel A Channel B lt o t o alo lt o 210 Sio 210 510 ao gt TO 3 6 gt TO 59 o Olo O O o S O s S O S eios SOs 8 os g OS 8 OSg Olg ARIE O g
10. ere The Q for electric resonant circuits is fo Q B B Bandwidth B fa fb fais the upper 3dB frequency fb the lower fo Resonance frequency fo fa x fb SEEBURG acoustic line SP2 5 Manual Page 17 SEEBURG acoustic line GmbH Auweg 32 D 89250 Senden Freudenegg www seeburg net
11. ny questions or problems while setting up your SP 2 5 please contact you SEEBURG acoustic line dealer 2 Controls and connections of the SP2 5 You will find the following controls on the front panel of the SP2 5 e Power on LED Signals the presence of Mains plugged in and switched on e Audio in Channel A and B Indicates presence of input singnal from Mix for Channel A and B e Link to next panel Channel A and B Parallel link out of the unprocessed input signal i e to other SP2 5 units or Amplifiers e Signal A B LED Indicates the presence of an input signal with a level over 20dB e Bass boost The additional bass boost 6dB 55Hz is switchable at the front panel The LED next to the switch will light up if active e Fullrange mounted decreased to prevent accidential switching This switch changes the high mid output to Fullrange mode The according LED will light up if active e Limit LEDs for woofer and high mid The four LEDs will light up if limiters are active SEEBURG acoustic line SP2 5 Manual Page 3 output to speakers Speakon connectors for speaker connection Pins 14 carry the high mid signal Pins 2 the bass signal Rear panel connectors on the of the SP2 Amp Return woofer and high mid Speakon connectors coding 1 A 2 B for connecting amplifier outputs to the SP2 5 inputs Please check for correct polarity NL4FC is 1 1 Signal to Amp sockets for high mid A B and woofer b
12. rack space 1U fig 1 connection diagram SP2 5 SEEBURG acoustic line SP2 5 Manual Page 2 Schaltbar Frontplatte jl Subsonic Bassboost Ultrasonic ST4 Tiefpass Phase Limiter yN fi f Eat Eq Di sz m cm ert Hin NES HALAL S__ 0 SO bd E 1 18dB r FA J ST5 feitung we i 6dB 100H 480Hz 40 80Hz 2 2kHz 11kHz Hochpass gt Phase Gain ed PL DEL mL he i von OdB bis C43 Frontplatte 13dB C44 Limiter Hochpass Tiefpass Phase Gain Sub ou 9 as LEG IP L lf 6 97 R117 R120 P4 P5 em e fig 1 block diagram SP2 5 If ordered together with a SEEBURG acoustic line system the SP2 5 will be delivered with settings for the specific system For allround applications the 2 5 will be delivered with a STD factory setting see appendix 4 3 To make changes in the configuration the unit must be opened SIPs resistor arrays or jumpers must be changed In doubt please contact your SEEBURG acoustic line dealer Important The unit must be shut off mains should be unplugged The manufacterer will not be held responsible for any problems due to unortherized handling 1 1 Using this manual We will briefly describe the teminology used to help you understand the unit and it s functions Since we cannot explain all technical terms regarding electroacoustics we have provided a glossary in the appendix In case you come about a
13. re always active and cannot be turned off see glossary appendix SEEBURG acoustic line SP2 5 Manual Page 8 3 4 Equalizer funktion The SP2 5 offers two fully parametric EQs and one semi parametric EQ fixed Q on every channel Adjustments are made via the corresponding trimmpots on the circuit board fig 8 and fig 9 A maximum cut boost of 12 db is available Please try to avoid cutting or boosting too extremely In order to activate the circuts the black jumper must be inserted to the corresponding postions marked EQ INSERT To deactivate the circuit insert the jumper to a position marked bypass EQ1 and EQ2 have different ranges to set the cutoff frequencies These frequencies are set by inserting different values of SIPs resistor arrays all E12 plus 20 kQ from E24 The frequency ranges and resistor values for the SIPs are listed in table 1 in the appendix The sockets for frequency selection SIPs on the circuit board are marked FREQUENCY Digital Audio Analysis System Signal level 4 2 dBV 1 40 E j 35 30 25 20 15 m 10 5 A ALA 1 NF LAM AMY WYT MW Fa p 15 20 3 50 100 200 300 500 1k 2k 3k 5k 10k 20k Hz ielay compensation acoustic no Test Signal PN8192 Int 320 0v in2 44 3Pa Out 0 a kHz 48 DUT Einsatzfrequenzen EQ1 SN SP25 o3 01 97 1
14. the phase of the bass band O0 to 1809 lightgreen jumper in positions 0 35 70 105 140 or 180 The phase of the hi mid band can be reversed by 180 To do this set the corresp onding lightgreen jumper to position 180 This phase correction can be usefull in case the acoustic centres of two loudspekers radiating the same frequency are horizontally not in plane transducer alignment This geometrical distance lets the acoustic energy radiated by the closer loudspeaker arrive the listeners ear earlier due to the shorter distance it has to travel resulting in unwanted interference at that particular frequency fig 4 phase correction see glossary appendix SEEBURG acoustic line SP2 5 Manual Page 6 The amount of phase correction in degrees you need at a given distance between loudspeakers As is calculated as follows As 360 Db z As 360 f C 0 Phase angle in degrees AS Distance between the loudspeakers in meters C Speed of sound in air at 101 3 hPa and 20 C approximatly 340 m s c increases decreases approximatly 0 6m s every 1 Celsius Example A wedge with two 12 and one 2 drivers needs to be setup using the SP2 5 in two way active configuration The acoustic centre of the 2 driver is 11 5 cm behind the center of the 12 drivers The crossover cutoff frequency is 1500 Hz The amount of phase correction for the 11 5cm in this example is 0 115m 360915001 7 3407 o 182 649 180 3 1 3 High Mid A
15. ttenuation The high mid attenuator allows the high mid band to be attenuated in 2 5dB steps in relation to the bass band i e if the bass driver has a lower efficiancy than the high mid driver This is done by setting the red jumper on the circuit board to the desired position The amount of attenuation is listed next to the socket fig 5 The first position marked 0 provides no attenuation or O dB OO 425 OO 10 OQ 5 OO r CIS OQQO 0 Attenuator HighMid fig 5 Jumper socket for the attenuation in the mid high band 3 1 4 Full range mode high mid band Depressing the decreased mounted full range switch on the front panel bypasses the highpass of the crossover This allows fullrange capable mid high systems to be operated over the complete bandwidth This full range mode is indecated by the corresponding LED lighting up 3 2 Limiter The SP2 5 includes four limiters high mid CH A und CH B Bass CH A und CH B attack release can be individually adjusted for each limiter in three steps the amount of power transmitted to the transducers can also be set here SEEBURG acoustic line SP2 5 Manual Page 7 To insure correct limiter function it is important to connect the speakers using the two speakon connectors speaker out on the front panel The amplifier outputs are connected via amp return connectors on the back panel of the SP2 5 By feeding the amplifiers output signal through the SP2 5 it is possible
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