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SERVICE MANUAL POWERED SUBWOOFER CONTENTS SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8 PARTS LIST: PRE AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10 POWER AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11 VOLTAGE SELECTOR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 PRE AMP AND POWER AMP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 8" SPEAKER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 POWER CORD CABLE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-16 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 EXPLODED VIEW DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-19 POWERED SUBWOOFER SPECIFICATIONS System Specifications Frequency Response Sensitivity Power Handling Dimension (W x D x H) Weight HF LF Crossover Frequency Impedance 70-20K Hz 85+/-2dB 70W Max 198 x 130 x 150 mm 2.1kg 12mm (0.5") tweeter 100mm (4") 3KHZ 4 OHM Woofer Specifications Rated Impedance Voice coil DCR Sweep Test Resonant Frequency (Fo) Sensitivity Rated Power Input Maximum Power Input Power Test 3.8 ohms +/- 0.8 at 1V 500 Hz 3 +/-0.15 ohm Sine Wave 4V at 20-20K Hz 65 +/- 15 Hz 85 dB/W/m 30W 60W 15W Music Max/Channel 30W RMS/Channel (The rated power is verified by performing power handling test by feeding rated output with "IEC268-5" for 8 hours) Ш74 x Ш38 x 15mm Ш55 x Ш26 x 9mm Main Magnet Bucking Magnet Tweeter Specifications Rated Impedance Voice coil DCR Sweep Test Resonant Frequency (Fo) Sensitivity Frequency Response Rated Power Input Main Magnet Magnet Material 4+/-0.8 OHM at 1V 5K Hz 3.2 +/-0.16 OHM Sine Wave 1 V at 500-20K Hz 2500 +/- 240 Hz 89 +/-2dB/W/m Fo - 20K Hz 30W Ш10 x 2mm N35 2 POWERED SUBWOOFER SPECIFICATIONS Subwoofer Specifications 1) CONTINUOUS POWER (@ 90Hz, 0.1% THD) THD (@90Hz 110W ) CLIPPING POWER (Output 1% THD @ 90Hz ) INPUT SENSITIVITY @ 120W 4 ohm 70Hz LINE . INPUT VOL . Max SPK . INPUT VOL . Max S/N @ 12W 75Hz @ 120W 75Hz ( A-WEIGHT, LINE INPUT ) LOW PASS FILTER @ 75Hz Freq