PowerBass Series PB12 Subwoofer PRELIMINARY SERVICE MANUAL
Contents
1. SPEAKER CONNECTION When we designed the PB10 and PB12 powered subwoofers our goal was to offer the user the best possible perforrrance corrbined with the rrost flexible and corrplete installation options Please look over the following three exarrples to deterrrine which description best matches your systemand follow the corresponding hookup instructions To use the binding post Speaker terrrinals with bare wire unscrew the collar until the hole through the center Dolby Pro Logic Non Digital Speaker Level Use this installation method for Dolby Pro Logic appli cations not Dolby Digital DTS or other digital processing where the receiver processor does not have a subwoofer output or a volume controlled preamp line level output Connect your receiver or arrplifier s front left and right speaker terrrinals to the left and right terrrinals on the subwoofer that are narked High Level In Connect the left and right terrrinals on the subwoofer that are narked High Level Out to the cor responding terrrinals on the back of your front left and right speakers Connect your receiver or arrplifier s center left and right surround speaker terrrinals to the corre sponding terrrinals on the back of your center left and right surround speakers post is visible under the collar Insert the bare end of the wire through the hole in the p2. m gO PHASE SWITCH W c AMI R9 n5 c5 R4 A 1 je C7 R34 R25 R10 R3 2000 7 556 R15 R30 R11 C6 RIA m g LP DEFEAT 28828 DDD 2 0209 p eN N N 12 790990209 2 N a 2 R D8 R28 SLIB 4 L3 R10B L4 C11 c m gt CJ 9 MS nU 2999979790 NNNNNNN AU SUNT 02 01 N N N o e Y 2 E R La N UJ La a N 2 pu LIUE Y 0 o 014 C26 58 RIDA oj 27 C C20 DIODE BRIDGE R34 C10 Li R41 2 ET uu 2 el R50 B AS CZA z e e HO 0 R49 LE 013 C42 REA R48 ac ZEE W PWRAMP Di R30 RZA RZB RZC R27 MODULE AMI 2000 PRI TRANS SILKSCREEN 18 FANCY Uersion 6 3 DUAL 3rd Order Hi Pass R27 xi R16 5k POT SW SPDT R28 33k2 1 LEVEL i 2 5 TLOG4 Phase Switch Or Or Ik R25 33k2 NOT USED RIT R13 R35 R15 2 E NOT USED 56k2 RCA CONNECTOR 604r R10 B POST HiLev 10k 2nd Order LO PASS 2nd Order Hi Pass Di C3 1 220pF LO PASS CONTROL 1 200uF kj ies RE R33 R18 20k POT 10 x Xx __
3. PowerBass Series 1 2 Subwoofer PRELIMINARY SERVICE MANUAL JBL Incorporated Inc 250 Crossways Park Dr Woodbury New York 11797 CONTENTS BASIC SPECIFICATIONS sampa ees pne 2 DE FAILED PB12SPECIFICATIONS ida tai seita 3 CONNECTIONS weso e mb A A Resa tre ute sale E E REDE 4 OPERATION Gun UT a 8 oa buoni a uhr i 9 ELECTRICAL PARTS LIST inue nd e Eh ax eed 10 MECHANICAL PACKING PARTS 87 222 15 PCB DRAWINGS arl sexus aede e WRA Ea MUN E 16 SCHEIWIATICS ranna o de Piu Ded AAA 19 GENERAL SPECIFICATIONS 12 Subwoofer Output Power 250 watts RMS Driver 12 Woofer Frequency Response 25Hz to Low Pass Frequency setting Inputs Line Level option LFE Speaker Level Outputs Speaker level fixed frequency 150Hz Low Pass Frequency Variable from 50Hz 150Hz High Pass Frequency 150Hz when using Speaker Level Output Dimensions H x W x D 15 1 2 x 15 x 16 394mm x 381mm x 406mm with feet 17 1 2 x 15 x 16 445mm x 381mm x 406mm Weight 40 Ib 18 2kg Refinements may be made on occasion to existing products without notice but
4. LED On Harness 11064 1N4148 R100 3 g CM disp DI4 e NOT USED 1 Un designated Connector 2 UI x 2k2 D13 On Harness On Harness amp z To U1 Pin 11 11 luF IN4148 1 MOLEX 2 MOLEX 2 2 2 asii ons C40 ca R47 lt 5 R40 e5 R43 1N5242B mute sali R41 D10 10k M GND 4 1000k D12 100uF 3 R42 R44 pee 2 Clr LED 2 Clr LED 3 Ik 1000k 1N5242B 15k 24 10uF sok 100k Q1 y 1 0 15 SZ 5 C24 ToUlPin4 ZIE maa NOT USED ding R21 4K7 e SHORT CIRCUIT PROTECT C25 R7A 2 2 RIC C6 D6 R6 R13 R14 NOT USED 4 R22 5 10k Q10k 10k INS334B 47R 47k 3k3 i 100nF R23 4 4 R12 CONNECTOR 187k AV SW DS 1N4735A Q10 Ei 2N4401 E gt 1N4148 c20 2N5401 ui sl D7 R27 1452658 13 SI NOT USED 10k is RIOA lt RIOB lt RIOC R28 l ae 0 IR 0 IR 0 IR H 4 RIA RIB RIC 14 7k5 4765 a lt gt NOT USED j R25 R29 8M2 8u5H cz R4 NOT USED aap C10 3 4u7F 100nF R30 IN4148 n 330nF ni 4Tk 10k 12 gi 1N4148 4 INN 4 f EXC gt R32 8u5H 220uH RIS 8u5H cw 1 NOT USED 47 NOT USED 100nF R9 S D 6 d NOT USED 4 ME 3 R5 Lil C21 DI E ER 56k2 11 e d C26 100nF 2 3n3F 10
5. C2 C20 Description TLO 64 LM324 200uF 100nF 100nF 100nF 100nF 100nF 150nF 330pF 330pF 200uF 100nF 2W 2W 2W 2W 5 Amp 5 Amp 5 Amp 5 Amp 5 Amp 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V metal metal metal metal Gapped Ecore choke ferrite bead ferrite bead ferrite bead choke 4632 transformer Power Switch PCB mount LED socket 2A SloBlo T type PB12 faceplate Power cord Strain relief OP amp OP amp BP Electrolytic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic BP Electrolytic mono ceramic 12 Part 30502 30502 30502 30101 30101 30101 30101 40730 Resistors 40405 40409 40731 40504 40412 40709 40732 40722 40722 40405 40722 40722 40109 40412 40405 40109 40412 40406 40403 40733 40734 40451 40406 40406 40406 40717 40717 Designator C21 C22 C23 C3 C30 C4 C5 C6 C7 C8 C9 R1 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R2 R20 R21 R22 R23 R24 R25 R26 R27 R28 R3 R30 R33 R34 R35 R4 R5 R6 R8 R9 Description 100nF 100nF 100nF 220pF NOT USED 220pF 220pF 220p Or Or 1k 4k7 10k 59k 45k3 33k2 68k1 NOT USED NOT USED 56k2 6k8 6k8 4k7 6k8 6k8 604 33k2 4k7 604r 33k2 100k 10k 12k1 120k 137k 100k 100k 100k 2k7 2k7 50V 50V 50V 50V 50V 50V 50V 25W 25W 25W 25W 25W 25W 2
6. Measurement Line Residual Noise Floor 1 5 mVrms max 2 freq harmonics BW 20 Khz EC EZ DZ E E Input Impedance Line Input L R LFE a n a Nominal Speaker Hi Level Input Em n a Nominal Filters LP filter 4th order fixed 60 180 10 2nd order variable 2nd order fix 24 db Octave Subsonic filter HPF 2nd Orde Fixed LFE Low pass 2nd order 200 gt LP lt 1K LFE input driven only HP speaker out connector 200 Hz 10 Speaker input driven 4 Ohms 100 10 Speaker input driven 8 Ohms Limiter THD at Max Output Power n a n a functional Maximum Output Power Maximum THD as a result of limiting Features Volume pot Taper lin log LOG functiona A Taper HP Speaker out YES functional Refer to Filter section Phase switch 0 180 EE functiona LP Filter defeat switch YES functional Disables LP filter intended for LFE LESTE SESC gt Input Configuration Line In L R LFE YES functional Dual RCA jack Spkr Hi Level In YES functiona Binding post connector L amp R Signal Sensing ATO Auto Turn On yes no YES ES functional ATO Input test frequency 50 Hz functiona M ATO Level LFE Input 4 functiona E Maximum acceptable level ATO Level Speaker in 50 functiona Maximum acceptable level Amp connected and on then ATO Turn on time 5 ms functional input signal applied Auto Mute Turn OFF Time 15 minutes 15 T before muting after signal Auto turn of time mustbe 5 gt T 15 LE ee a GP
7. Pro Logic Non Digital Speaker Level Use this installation method for Dolby Pro Logic appli cations not Dolby Digital DTS or other digital processing where the receiver processor does not have a subwoofer output or a volume controlled preamp line level output Connect your receiver or arrplifier s front left and right speaker terrrinals to the left and right terrrinals on the subwoofer that are marked Level In Connect the left and right terrrinals on the subwoofer that are marked High Level Out to the cor responding terrrinals on the back of your front left and right speakers Connect your receiver or arrplifier s center left and right surround speaker terrrinals to the corre sponding terrrinals on the back of your center left and right surround speakers post is visible under the collar Insert the bare end of the wire through the hole in the post then screw the collar back down until the connection is tight The holes in the center of the collars are intended for banana type connectors Left Front Right Front Receiver Left Front Center Right Front rl BI Right Surround Left Surround
8. nakes difference which jack you choose Connect each speaker to the corresponding speaker terrrinals on your receiver or arrplifier Max 9 NORMAL PHASE 0 180 CROSSOVER FREQUENCY 50Hz LINE LEVEL IN L HIGH LEVEL IN LEVEL OUT Make sure your receiver or processor is configured cor rectly Make sure that the sub woofer is configured as Note for advanced users If your receiver processor has a built in low pass crossover filter for the subwoofer output then the LFE switch should be set to the LFE position to bypass the subwoofer s internal crossover Dolby Digital or DTS or Other Digital Surround Mode Connection Use this installation rrethod for Dolby Digital DTS or other digital surround processors IMPORTANT Make sure that the LFE toggle switch on the subwoofer is in the LFE position Use the line level input jacks for the Low Frequency Effects channel Connect these jacks to the LFE output or subwoofer output on your receiver or arrplifier Note If your receiver or arrplifier only has one subwoofer output jack RECEIVER PREAMPLIFIER Subwoofer Output LFE then you may connect the subwoofer output on your receiver prearrplifier to either the left or right line level input on the subwoofer It makes difference which jack you choose Connect each speaker to the corresponding speaker terrrinals on yo
9. will always meet or exceed original specifications unless otherwise stated PowerBass is a registered trademark of JBL Incorporated JBL PB 12 250W Powered Sub Amp LINE VOLTAGE Yes No Nom Unit Notes US 120vac 60Hz Yes 108 132 120 Vrms Normal Operation EU 230vac 50 60Hz Yes 207 264 230 Vrms Normal operation MOMS required Parameter Specification Limits Conditions Notes Amp Section ES Type Class AB D other D n a n a Load Impedance speaker 5 6 n a Nominal Rated Output Power 250 Watts 145 1 input driven Peak THD 9 Rated Power 0 3 96 1 22k filter 145 Watts THD Q 1 Watt 0 1 96 0 5 22k filter DC Offset 10 mV DC 20 Speaker Outputs Measured at the speaker cable 150 Watts Damping factor gt 50 35 Measured at amplifier board THD 0 1 50 Hz Input Sensitivity Input Frequency 50 50 Nominal Freq L amp R 240 mVrms 248 150 Watts Single input driven LFE input 240 2dB To 150 Watts Single input driven LFE switch ON Speaker Hi Level Input 24 Vrms 248 150 Watts Single input driven VE Signal to Noise SNR A Weighted 90 80 relative to rated power A Weighting filter SNR unweighted 85 80 relative to rated power 22k filter SNR rel 1W unweighted 65 dBr 60 relative to 1W Output 22k filter Residual Noise Floor 1 2 Volume 2 max using RMS reading DMM VOM or A P BW 20 Khz Volume 9 max w A P Swept Bandpass
10. 5401 120V PNP 600mA 60155 Q11 2N5401 120V PNP 600mA 60156 Q12 2N4401 40V NPN 600mA 60102 U1 TLO64 Quad OpAmp Capacitors 30710 C1 2200uF 100V 80 20 Electrolytic 105C 30718 C10 4u7F 100V BP NP Electr DF 1 30523 C11 330nF 100V mono ceramic 30710 C2 2200uF 100V 80 20 Electrolytic 105C 30532 C20 220nF 250V metallized polyester 30502 C21 100nF 50V mono ceramic 30502 C22 100nF 50V mono ceramic 30527 C24 330nF 50V mono ceramic C25 NOT USED 30508 C26 10nF 50V mono ceramic 30513 C27 3n3F 50V mono ceramic 30502 100nF 50V mono ceramic 30711 C32 22uF 35V 80 20 Electrolytic 30715 C40 10uF 16V 80 20 Electrolytic 30716 C41 1uF 16V 80 20 Electrolytic 30717 C42 100uF 16V 80 20 Electrolytic 30502 C6 100nF 50V mono ceramic 30521 C7A 100nF 250V ceramic film 30521 C7B 100nF 250V ceramic film GW NOT USED 30505 CZ 100nF 100V ceramic film 10 Part Resistors 40105 40105 40105 40420 40420 40417 40718 40735 40735 40735 40405 40736 40737 40722 40738 40739 40739 40735 40735 40735 40703 40738 40417 40417 40427 40403 40740 40420 40701 40741 40701 40406 40415 40701 40409 40409 40726 40732 40727 40111 40738 Designator R100 R10A R10B R10C R11 R12 R13 R14 R15 R1A R1B R1C R21 R22 R23 R24 R25 R26 R27 R28 R29 R2A R2B R2C R3 R30 R31 R32 R33 R34 R4 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R5 R50 R6 R7A Description NOT USED 0 1R 5W metal 0 1R 5W metal 0 1R
11. 5W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W 25W mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic mono ceramic Metal Resistor carbon carbon carbon metal metal metal metal carbon carbon carbon carbon carbon metal metal metal metal metal carbon metal metal metal metal carbon carbon carbon carbon carbon 13 Miscellaneous 108320 108116 108116 40402 40707 70150 70150 RCA CONNECTOR HI LEVEL I O HI LEVEL I O LEVEL Crossover CONTROL LFE switch Phase Switch Binding Post OUT Binding Post IN 5k POT 20k POT SW SPDT SW SPDT DUAL RCA yellow Binding Post Binding Post Log A Pot Lin B Pot mini Toggle mini Toggle 14 PB12 MECHANICAL amp PACKING PARTS LIST Part 203500 203410 203520 203430 203550 Description 12 Woofer Foot Outer Carton Owner s manual 120V Amplifier complete Vers63 gtl Board layer 1 Scale 1 20 Wed May 17 08 36 44 2000 8 8 COMP SIDE d 000000000 FANCY Version 6 3 17 125 holes NOT thru plated Vers63 gto Board layer 1 Scale 1 36 Wed May 17 08 38 34 2000 REMOTE R IN L OUT R OUT Level LOPASS E im JE C20 CONTROL pop 222 m PREAMP Uersion 6 3
12. 5W metal 1k 25W carbon 1k 25W carbon 47k 25W carbon 3k3 25W carbon NOT USED 7k5 2W metal 7k5 2W metal 7k5 2W metal 4K7 25W carbon 42K2 25W metal 187k 25W metal NOT USED NOT USED 6k8 25W carbon 10k 2W metal 1k2 0 25W carbon 1k2 0 25W carbon 7k5 2W metal 7k5 2W metal 7k5 2W metal 8M2 25W carbon 10k 2W metal 47k 25W carbon 47k 25W carbon 23k7 25W metal 10k 25W metal 33k 1W metal 1k 25W carbon 1000k 25W carbon 22k 5W metal 1000k 25W carbon 100k 25W carbon 470K 25W carbon 1000k 25W carbon 10k 25W carbon 10k 25W carbon 15k 25W carbon 56k2 25W metal 2k2 25W carbon 47R 25W carbon 10k 2W metal 11 Part 40738 40738 40738 40738 Miscellaneous 80121 80122 80122 80122 80100 60302 108326 80116 70151 70322 80117 70324 70323 70325 80105 70305 Designator R7B R7C R8A R8B R9 L1 L2 L3 L4 CMC MODULE Led Harness Transformer Switch LED socket 3AG FUSE 0 187 PCB Tabs PCB Fuse Holders PB12 faceplate Power cord Strain relief Description 10k 10k 10k 10k NOT USED 220uH 8u5H 8u5H 8u5H 2m2H S64AMI With two LED s M Glued into cabinet 100VA MCI4632 SW SPST PB12 PREAMP PCB Version 46 3 Part Semiconductors 60102 60100 Capacitors 30707 30504 30504 30504 30504 30530 30531 30100 30100 30707 30502 Designator U1 U2 Film Caps may be used in any position EXCEPT C1 C2 C1 C10 C11 C12 C13 C16 C17 C18 C19
13. __ nu e e TA 17 6 gt OUT 2 150nF 100nF 200uF 4k7 2 C20 LO PASS CONTROL 2 R8 220 en R3 2k7 220pF 120k 100nF 100nF m 2nd Order LO PASS g 8 R21 SW SPDT O 89 GAIN STAGE X 5 2 O Un designated Connector To Pin 11 01 02 100nF 3 C30 o R22 UU B NOT USED R30 15V NC 2 6k8 LoPass Defeat Sw 10k 2 mute a 9 Mx 2 8 4 GND Led Harness ip E a A SIG 8 5 11 R23 To 15VO 6 15V 0 NET E p To Pin 14 01 02 kOr USED E a sz gt 100nF NOT USED NOTUSED NOTUSED Title B12 PREAMP 6 3 pcb Size Number Revision Tabloid 5 Date 20 Apr 2000 Sheetl of 1 File T PB12 sch Folder PB12 preamp Rev5 chrawn By MS LL 1 2 3 4 I 2 3 4 5 6 7 E 9 0 R46 R45 1000k SIGNAL LED amp AUTO MUTE p Not Connected V
14. gt oU fl Power on Delay time 3 sec 4 AC Power Applied Transients Pops Em ATO Transient 5 mV peak n a Speaker Outputs Turn on Transient 50 2v pp Speaker Outputs AC Line cycled from OFF to ON Turn off Transient 50 mV peak 2v pp Speaker Outputs AC Line cycled from ON to OFF Efficiency Efficiency 65 96 64 Nominal Line voltage 120 VAC Stand by Input Power 24 Watts 26 nom line voltage Power Cons 9 rated power 234 Watts 240 nom line voltage 150 Watts 5 6 Ohms nominal line voltage EO RE ai Short Circuit Protection YES functional Direct short at output Amplifier should resume operation after short Thermal Protection YES functional DC Offset Protection YES DC present at Speaker Out leads Line Fuse Rating USA Domestic 120v 2 Amps Type T or Slo Blo 250 V EU 230v 1 Amps Type T or Slo Blo 250 V External fuse with UL SEMKO rated holder SPEAKER CONNECTION When we designed the PB10 and PB12 powered subwoofers our goal was to offer the user the best possible perforrrance corrbined with the rrost flexible and corrplete installation options Please look over the following three exarrples to deterrrine which description best matches your system and follow the corresponding hookup instructions To use the binding post Speaker terrrinals with bare wire unscrew the collar until the hole through the center Dolby
15. n Adjust the phase switch to maxinize bass output at the listening position Rerrerrber every system roomand listener is different There are no right or wrong settings this switch offers the added flexibility to adjust your subwoofer for optimum perforrrance for your specific listening conditions without having to nove your speakers If at some time TROUBLESHOOTING If you used the high level Speaker inputs and there is no sound fromany of the speakers Check that receiver arrplifier is on and a source is playing Check that powered subwoofer is plugged into an active electrical outlet andis switched on Check all wires and connections between receiver arrplifier and speakers Make sure all wires are connected Make sure none of the speaker wires are frayed cut or punctured Review proper operation of your receiver arrplifier If there is low or no bass output Make sure the connections to the left and right Speaker Inputs have the correct polarity e Make sure that the subwoofer is plugged into an active electrical outlet and PB12 only switched on Adjust the crossover point Flip the Phase Control Switch to the opposite position If you are using a Dolby Digital DTS receiver or processor make sure that the subwoofer adjustrrents on the receiver processor are set up correctly Slowly turn the Level Control clockwise until you begin to hear the desired am
16. nF VP 4 z 5829 T GND d DE 100nF 4 4 1N47444 MODULE MCI4632 On Faceplate 3AG FUSE On Faceplate DA IP lt ACFed gt VY SW SPST BR RECT 2A SloBlo RS604 i R8A R amp B Title 10k 10k B12 PwrAmp 6 0 PCB 2 22000F Size Number Revision 2200uF D 1 5 Date 20 Apr 2000 Sheet 1of 1 File T PB12 sch Folder PB12 PwrAmp Rev5 sElrawn By _ MA LL 9 8 10
17. ntrol is not used when the LFE switch is in the LFE position fromgreen to red after the input signal to the subwoofer is removed Due to J BL s unique high output high efficiency arrplifier design power consurrption is minimal when the subwoofer is not receiving a signal Of course the PB12 subwoofer can be roomsize subwoofer placement type of main speakers and listener position Adjust the subwoofer level so that the volume of the bass information is pleasing to you turned off whenever desired The PB10 must be unplugged if you do not wish to leave it in auto standby mode LEVEL nine em us soma PHASE 6 D CROSSOVER FREQUENCY gt 55 10 L R LINE LEVEL IN For LFE use L or R JBL PowerBass PB10 CAUTION AFTER LEVEL PHASE 180 PowerBass 12 L R LINE LEVEL IN 9 For LFE use L or R CROSSOVER FREQUENCY OFF 120V 60Hz 160W PowerBass PB12 CAUTION lt Phase Control 0 fw Phase The Phase Control deterrrines whether the subwoofer s piston like action moves in and out in phase with the main speakers or opposite the speakers There is no correct or incorrect setting Proper phase adjustment depends on several variables such as subwoofer placement and listener positio
18. ost then screw the collar back down until the connection is tight The holes in the center of the collars are intended for banana type connectors Left Front Right Front Receiver Left Front Center Right Front f mI Left Surround FIE FE Dolby Pro Logic Non Digital Line Level Use this installation method for Dolby Pro Logic appli cations not Dolby Digital DTS or other digital processing where the receiver processor is equipped with a subwoofer output or a volurre controlled prearrp line level output Use RCA type patch cords to connect the line level subwoofer outputs on your receiver or arrplifier to the line level inputs on the subwoofer IMPORTANT Make sure that the LFE toggle switch on the subwoofer is in the Normal position Do not RECEIVER Subwoofer eo ee e use the LFE position with Dolby Pro Logic only processors Note If your receiver or arrplifier only has one subwoofer output jack then you may connect the subwoofer output on your receiver prearrplifier to either the left or right line level input on the subwoofer It
19. ount of bass in the future you happen to rearrange your listening room and rrove your speakers you should experiment with the phase switch in both positions and leave it in the position that maximizes bass perforrrance If you used the line level inputs and there is no sound fromthe subwoofer Check that receiver arrplifier is on and a source is playing Check that powered subwoofer is plugged into an active electrical outlet and is Switched on Check all wires and con nections between receiver arrplifier and subwoofer Make sure all wires are connected Make sure none of the wires are frayed cut or punctured Review proper operation of your receiver arrplifier Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass Make sure that you have configured your receiver processor so that the subwoofer LFE output is on 9 Electrical Parts List PB12 PB12 POWERAMP Version 6 3 Parti Designator Description 50100 BR RECT RS604 6AMP Bridge rectifier 50105 D1 1N4744A 15V 1w Zener 50112 D10 1N5242B 12V 5w Zener 50104 D11 1N4148 Sig Diode 50112 D12 1N5242B 12V 5w Zener 50104 D13 1N4148 Sig Diode 50104 D14 1N4148 Sig Diode 50105 D2 1N4744A 15V 1w Zener 50114 D3 1N5265B 62V 5w Zener 50104 04 1N4148 Sig Diode 50113 D5 1N4735A 6 2V 1W 50103 D6 1N5234B 6V 5w Zener 50104 D7 1N4148 Sig Diode 50104 D8 1N4148 Sig Diode 60157 Q1 2N5457 25V N chnl FET 60155 Q10 2N
20. ur receiver or arrplifier Make sure that you have configured your surround Sound processor for Subwoofer or LFE On The front left front right Max CROSSOVER FREQUENCY NORMAL e center and rear speakers should be set to Small or Large depending on their size and frequency response Consult your receiver s or processor s owner s Manual OPERATION Power When the unit is plugged in and for the PB12 only the power switch is on and no signal is received the LEDs on the front of the unit will turn red When a signal is present the LEDs will turn green Note It will take several rrinutes for the LEDs to turn Level Control The subwoofer Level Control adjusts the volurre of the subwoofer relative to the rest of the system Proper level adjustment depends several variables such as Crossover Adjusiments The Crossover Frequency Control deterrrines the highest frequency at which the subwoofer reproduces sounds If your main speakers can corrfortably reproduce sorre low frequency sounds set this control to a lower frequency setting between 50Hz 100Hz This will concentrate the subwoofer s efforts on the ultradeep bass sounds required by today s films and music If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies set the low pass crossover control to a higher setting between 120Hz 150Hz This co
Download Pdf Manuals
Related Search