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SERVICE MANUAL

Subwoofer Amplifier Model: RW-12

Klipsch Inc.

CAUTION!
Lethal voltages are present and exposed when cover is off of amplifier.

Only qualified service technicians should attempt to repair this product.

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TABLE OF CONTENTS

SPECIFICATIONS ...................................................................................................................................... 3 Model: RW-12 ............................................................................................................................................ 3 THEORY OF OPERATION ....................................................................................................................... 4 INPUTS....................................................................................................................................................... 4 SIGNAL CONDITIONING ......................................................................................................................... 4 OUTPUT..................................................................................................................................................... 4 POWER SUPPLY........................................................................................................................................ 4 OTHER FEATURES ................................................................................................................................... 5 PARTS LISTS ............................................................................................................................................... 6 SCHEMATIC DIAGRAMS....................................................................................................................... 10 BLOCK DIAGRAM ................................................................................................................................... 13

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SPECIFICATIONS

Model: RW-12
Rated Power Output Maximum Power Output Frequency Band-width THD 340 Watts Continuous into 4 825 Watts(peak) into 4 16 - 115Hz < 1.0% @ 1 Watt < 2.0% @ Rated Power < 5.0% @ Maximum Power 98dB or better <500µV Line Input = 150mVrms @ 80Hz Speaker Input = 580mVrms @ 80Hz Line Input = 48dBv @ 80Hz Speaker Input = 25dBv @ 80Hz Line Input = 10K Speaker Input = 200 Line Input = 10mVrms (20Hz - 2kHz) Speaker Input = 130mVrms(20Hz - 2kHz) 1-2 Seconds > 15 minutes Variable 40 - 120Hz with 24dB/Octave Slope Variable 0 - 180°

Signal to Noise 60 Hz Hum Input Sensitivity for Rated Output Circuit Gain

Input Impedance

Auto-on Sensitivity Auto-On Delay Auto-Off Delay Low Pass Phase Control

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THEORY OF OPERATION
RW-12 Amplifier

INPUTS
This amplifier utilizes two RCA connectors(L & R) for LINE LEVEL signal input. A second RCA connector is LFE input. There is also a set of binding post connections for SPEAKER (HIGH) LEVEL input.

SIGNAL CONDITIONING
All pre-amplification, filtering, and signal conditioning is accomplished using quad op-amp devices U1, U2, U3, and U4. Op-amp U1B, and U1C are gain stages that performs the necessary buffering and isolation of the input signals. The input signal/s from Line In and Speaker In are fed to summing amp U1B. From there the signal passes through the fixed Low Pass filter U1A, and the variable Low Pass filter U2B. Stage U1C buffers the LFE In signal. The signal from the LFE input bypasses the LowPass filters stages and is summed back into the normal signal path at the volume control stage U2C. From there the signal is split into 2 paths; the high frequency path U2D/U2A and the low frequency path consisting of U3C/U3A/U4D/U4C. U2D is a unity gain buffer stage and U2A is a High Pass filter tuned to approximately 55Hz. U3C is a limiter/compressor, U3A is a unity gain buffer, and U4D and U4C form a Band Pass filter with a bandwidth of approximately 19 - 30Hz. The signals are summed back together at U4B which also provides additional gain. U4A is a variable phase control stage.

OUTPUT
The Power Amplifier(PA) section of this amplifier is a balanced bridge design. Signal splitter stages U100A and U100B feed pre-amps U100D and U100C which in turn feed the signal to the linear driver stages Q701-704, and Q707-710. The signal is then applied to the power output MOSFET's Q105/Q106, and Q111/Q112. The maximum output capability of the amplifier is determined primarily by the output transistor type, and the DC rail voltage/current supplied by the power supply. The value of feedback resistors R126and R146 determine the gain of the PA section. Trimmer pots R714 and RP734 establish the DC offsets.

POWER SUPPLY
The RW-12 utilizes a high current switching power supply with proprietary output controller circuitry. This controller circuitry tracks the input signal and continually adjusts the rail voltages to what is needed at the time. This creates a high efficiency amplifier since very little current is flowing when not needed. The power supply also supplies a highly regulated +/- 15Vdc for the op-amps.

LIMITERS
This amplifier contains Compressor/Limiter circuits for the purpose of controlling the signal so as not to drive the speakers beyond their physical limits. Op-amp stage U3B and JFET Q1 form an overall Compressor/Limiter which limits the output to the speakers to the rated power level. U3D and JFET Q2 form a Compressor/Limiter in the low frequency path limiting the power output only below a specific frequency. In the RW-12 this frequency is approximately 30Hz.

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OTHER FEATURES AUTO ON/OFF
This amplifier features an automatic on/off circuit that allows the user to set up once and forget it. With the power switch in the "AUTO" position, a switching circuit consisting of U1D, U5A, & U5B, senses an input signal. From this switching circuit, JFET Q100 on the power amp board is biased OFF which removes the grounding of the signal. For the protection of the speaker when the amplifier is first plugged in, there is a short delay before JFET Q100is biased OFF. The sensing circuit will bias Q100 ON after the input signal is absent for approximately 15 minutes or more which shorts the signal path to ground. With the power switch in the "ON" position the signal sensing circuit is bypassed and Q100 is always turned OFF. A bi-color LED indicates the status of the amplifier at any given time. The LED will be GREEN when the control circuit is activated and RED when in sleep mode.

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RW-12 PARTS LIST
PART POWER SUPPLY BOARD
T400 L402 L200 C430,C431,C433,C434 C200,C208 C202 C204 C205,C206,C209,C407,C421,C422,C424 C207 C413,C414,C435,C436 C417 (120V) C417 (230V) C418,C419 C427,C428 C426 C412 C415,C416 C400,C432 C203 C403,C429 D400 D407 D203,D408 D405,D406 D200 D201 Z405 R400 Z400 Q201 Q403,Q405 Q404 Q401,Q402 Q200 R422,R423 R426 R401,R414 R427,R428 R214 R412 R215 R200 R416 R415 R202 R413,R421 R209 R201 R206 R211 R425 XFMR, POWER 100V HC TRAN ETD39 IND, CM CHOKE 1.8mH IND, POWER 16T 19.2UH W/BOBBIN NOT INSTALLED CAP, CA 470PF 100V 5% CAP, CA 1000PF 100V 10% CAP, CA 2200P 100V 10% CAP, CA .1UF 50V 20% CAP, CA .01UF 100V 20% CAP, C 1UF 100V 20% .2LS CAP, CY1 1500PF 250V 20% .4LS CAP, CY1 4700PF 250V 20% .4LS CAP, E 47UF 50V 20% 5MMLS CAP, E 470UF 200V 20% 22X40 CAP, E 22UF 50V 20% 5X11 5MMLS CAP, E 1000UF 100V 18X40 CAP, F .1UF 250V 10% 10MMLS CAP, FX .22UF 250V 10% 22MMLS CAP, F 6.8UF 250V 5% 27.5MMLS CAP, F .1UF 250V 10% 5MMLS RECT, 6A 400V BRIDGE PRETRIM RECT, 16A 200V CATHODE FEP16DT RECT, 1A 100V FAST REC 1N4934 RECT, 1A 600V ULTRAFAST MUR160 RECT, 15A 200V ULTRA MUR1520 RECT, 100mA 75V SIGNAL 1N4148T ZENER, 500MW 16V 5% 1N5246B SURGISTOR, 10R 2A CL-110 VARISTOR, 275V 100J .6W TRANS, PNP 40V .6A TO92 2N4403 TRANS, NPN 40V .6A TO92 2N4401 TRANS, NPN 150V 0.6A 2N5551TR MOSFET, IRF740 TO220AB IR ONLY MOSFET, IRF540 TO220AB IR ONLY NOT INSTALLED RES, CF 160K 1/4W 5% RES, MF 100K 1/4W 1% RES, MF 100R 1/4W 1% RES, MF 47R5 1/4W 1% RES, MF 4K75 1/4W 1% RES, MF 90R9 1/4W 1% RES, MF 16K5 1/4W 1% RES, MF 49K9 1/4W 1% RES, MF 8K45 1/4W 1% RES, MF 8K66 1/4W 1% RES, MF 10R 0.6W 1% FLAMEPROOF RES, MF 22R 0.6W 1% FLAMEPROOF RES, MF 2K26 1/4W 1% RES, MF 100R 0.6W 1% FLAMEPRF RES, MO 330R 2W 5% RES, MO 47K 1W 5%

DESCRIPTION

KLIPSCH PT #

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RW-12 PARTS LIST
PART
R203,R204,R210 U200 C1 C6 C3 D1,D2,D3,D4 Q2,Q4 Q1,Q3 R6,R9 R12 R2,R3 R5 R10,R11 R1 R4 U1 U402 C11 C1,C2 D11 D12 D13,D14 Z1,Z2 Q11 R12 R1,R4 R2,R3,R5,R6 R11,R13,R14

DESCRIPTION
RES, MO 0R1 2W 5% 1W BODY

KLIPSCH PT #

BASH CONTROLLER BOARD

SUBASSY, BASH CNTRLR MULTI CAP, CA 1000PF 100V 10% CAP, CA 47PF 50V 10% CAP, F 2200PF 100V 5% 5MMLS RECT, 100mA 75V SIGNAL 1N4148T TRANS, NPN 40V .6A TO92 2N4401 TRANS, PNP 150V 0.6A 2N5401TR RES, CF 10K 1/8W 5% RES, MF 2K32 1/4W 1% RES, MF 1K00 1/8W 1% RES, MF 1K50 1/8W 1% RES, MF 475R 1/8W 1% RES, MF 6K81 1/8W 1% RES, MF 3K65 1/8W 1% PWM, 8PIN DIP UC3842N SUBASSY, PDC CNTRLR 1014 CAP, CA 4700PF 100V 10% CAP, F 3300PF 63V 5% 5MMLS RECT, 1A2 60V DIAC HT60TR RECT, 100mA 75V SIGNAL 1N4148T RECT, 100MA 200V SIGNAL 1N3070 ZENER, 500MW 15V 5% 1N5245B TRANS, PNP TO92 MPSA92TR RES, MF 1K00 1/4W 1% RES, MF 392R 1/4W 1% RES, MF 750R 1/4W 1% RES, MF 200K 1/4W 1%

PDC CONTROLLER BOARD

FEATURE BOARD C1,C107
C124 C126,C128 C125 C101,C108,C110,C122 C118,C127 C123 C129,C130 C102,C109,C113 C103,C105,C111,C112,C114,C116,C117 C121 C104,C106,C115 D100,D101,D102,D103,D104,D105,D106,D107,D108,D109,D110, D111 Z100,Z101,Z102,Z103 Z104 Q1,Q2 R111,R116,R125,R139,R144,R175 R178 R174 R148 NOT INSTALLED CAP, C 470PF 1KV 10% .2LS TR CAP, CA 1000PF 100V 10% CAP, CA .1UF 100V 20% CAP, CA 100PF 100V NPO 10% CAP, E 47UF 50V 20% 5MMLS CAP, E 22UF 50V 20% 5X11 5MMLS CAP, E 4.7UF 50V 85D 5X11 5MML CAP, E 22UF 35V BP 8X11 5MMLS CAP, F .1UF 63DC 5% 5MMLS CAP, F .01UF 100V 5% 5MMLS CAP, F .047UF 100V 5% 5MMLS RECT, 100mA 75V SIGNAL 1N4148T NOT INSTALLED ZENER, 500MW 7.5V 5% 1N5236B JFET, N CHAN J108 TO92 NOT INSTALLED RES, CF 1K0 1/2W 5% RES, CF 150R 1/4W 5% RES, CF 100K 1/4W 5%

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RW-12 PARTS LIST
PART
R172 R169 R113,R117,R127,R141,R146,R156 R173 R166,R167 R107,R108,R109,R120,R121,R129,R137,R157,R158,R177,R179,R184 R149 R119,R133,R176 R101,R104,R128,R182,R183 R170 R143 R138,R140 R123,R135,R164 R145 R126 R147 R110,R112,R114,R115 R142,R168 R118,R122,R134 R124,R171 R153 R160,R161,R162 R165 R159 R131 R132 R150,R163 P1 P2 R103,R106,R180,R181 R102,R105 S1 U5 U1,U2,U3,U4 J2 J1

DESCRIPTION
RES, CF 470R 1/4W 5% RES, CF 150K 1/4W 5% RES, ZERO OHM 1/4W RES, CF 9M1 1/4W 5% RES, MF 1K00 1/4W 1% RES, MF 10K0 1/4W 1% RES, MF 100R 1/4W 1% RES, MF 2K21 1/4W 1% RES, MF 33K2 1/4W 1% RES, MF 3K32 1/4W 1% RES, MF 5K11 1/4W 1% RES, MF 82K5 1/4W 1% RES, MF 200R 1/4W 1% RES, MF 17K4 1/4W 1% RES, MF 25K5 1/4W 1% RES, MF 274K 1/4W 1% RES, MF 16K2 1/4W 1% RES, MF 8K06 1/4W 1% RES, MF 2K80 1/4W 1% RES, MF 475K 1/4W 1% RES, MF 4K99 1/4W 1% RES, MF 200K 1/4W 1% RES, MF 1M0 1/4W 1% RES, MF 2K55 1/4W 1% RES, MF 124K 1/4W 1% RES, MF 21K0 1/4W 1% RES, MF 237K 1/4W 1% POT, B50K DUAL / BRACKET POT, B1M SINGLE / BRACKET RES, MO 1K 2W 5% TR SMALL BODY RES, MO 220R 2W 5% SWITCH, SPDT TOGGLE C/W CAP PC OPAMP, QUAD 14PIN DIL LM324N OPAMP, QUAD 14P DIL TL074CN DUAL JACK RCA RCA SINGLE PC MT

KLIPSCH PT #

118795

118798

118792 118794

LINEAR BOARD
C706,C707,C712,C713 C105,C111 C116,C117,C122,C123,C701,C702 C109,C115 C118,C119 C101 C120,C121 C100,C104,C110 C103 C102 D100,D101,D103,D104,D109,D110,D702,D705,D706,D707,D708, D711,D712,D713 RT1 Q702,Q708 Q701,Q707 CAP, CA 470PF 100V 5% CAP, CA 2200P 100V 10% CAP, CA .1UF 50V 20% CAP, C 10P 50V 5% CAP, E 47UF 50V 20% 5MMLS CAP, E 22UF 50V 20% 5X11 5MMLS CAP, E 100UF 35V 85DEG 5MMLS CAP, E 4.7UF 35V BIPOLAR 5X11 CAP, F .22UF 63V 5% 5MMLS CAP, F .082UF 63VDC 5% 5MMLS RECT, 100mA 75V SIGNAL 1N4148T THERM, PTH9L04BD222TS2F510 TRANS, PNP 40V .6A TO92 2N4403 TRANS, NPN 40V .6A TO92 2N4401

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RW-12 PARTS LIST
PART
Q704,Q710 Q703,Q709 Q105,Q111 Q106,Q112 Q100 R718,R719,R738,R739 R709,R710,R711,R712,R729,R730,R731,R732 R120,R121,R140,R141 R102,R103,R104,R105,R106,R107,R127,R128 R713,R717,R733,R737 R715,R716,R735,R736 R101 R126,R146 R122,R123,R142,R143 R714,R734 R111,R112 R109,R110 U100 U102 U103

DESCRIPTION
TRANS, NPN 150V 0.6A 2N5551TR TRANS, PNP 150V 0.6A 2N5401TR MOSFET, IRF9540 TO220AB MOSFET, IRF530 TO220 (IR ONLY) JFET, N-CH J113 TO92 TR RES, CF 330R 1/4W 5% RES, CF 510R 1/4W 5% RES, MF 1K00 1/4W 1% RES, MF 10K0 1/4W 1% RES, MF 2K00 1/4W 1% RES, MF 3K92 1/4W 1% RES, MF 20K0 1/4W 1% RES, MF 64K9 1/4W 1% RES, MF 22R 0.6W 1% FLAMEPROOF POT, 500R 8MM HOR TOP ADJ/COVR RES, MO 150R 3W 5% 2W BODY RES, MO 0R1 2W 5% 1W BODY OPAMP, QUAD 14P DIL TL074CN VREG, +15V 500MA LM7815CT VREG, -15V 500MA LM7915CT

KLIPSCH PT #

PANEL
POWER SOCKET FUSE (120V) FUSE (230V) KNOBS SWITCH HIGH LEVEL + HIGH LEVEL IEC/FUSE COMBO SOCKET FUSE, T3.15A/250V, 5X20MM, SLOW BLO FUSE, T1.6A/250V, 5X20MM, SLOW BLO POT, KNOB CR00-15MB-16H ROCKER TV5 C/W TERM SINGLE BINDING POST RED SINGLE BINDING POST BLK

118814 118810 118811

CABLES
VOLUME CONTROL LED POWERSUPPLY TO LINEAR LINEAR TO FEATURE FEM-FEM HARNESS 3P 40" FEM-LED R/G 4" 2PIN 3M CNCTR, FEM-FEM HARNESS 8P 9"

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