zeron Posted January 24, 2017 Share Posted January 24, 2017 My old Klipsch subwoofer SW-12 started making noises. I may be able to get it work without overheating (by applying a dirty fix), but probably I won't be able to fix the overheating problem itself. One option I've started considering is replacing its amplifier with a compatible plate amplifier. The following is the specification for my SW-12 from its service manual: Input Sensitivity for max Rated Output: Line input 60mVrms @ 30Hz. Speaker input 700mVrms @ 30Hz. Maximum Rated Output: 150 Watts into 8 ohms. Max. Hum: 3.5mV @ 60Hz. Max. Distortion: 4% At Full Rated Output. Freq Response: 27 to 120Hz +0/-3dB w/12dB per Octave Rolloff. Bass Boost: +6dB Boost @ 30Hz. Low Pass Crossover: Variable from 40 - 120 Hz. 24dB/Octave slope above 120 Hz. High Pass Crossover: Line outputs fixed at 80 Hz, 6dB/Octave slope. Speaker outputs fixed at 120 Hz, 6dB/Octave slope. The following is the specification for Yung SD300-6 300W Class D Subwoofer Plate Amplifier Module with 6 dB at 30 Hz: • Measured power output: 300 watts RMS into 4 ohms @ < 1.0% THD • Signal to noise ratio (at rated power): >90 dB • Input sensitivity (@ low level): 210 mV/50 Hz • Bass boost: 6 dB @ 30 Hz • Low pass adjustment: 40 Hz to 200 Hz • Phase adjustment: Continuously variable from 0º (normal) to 180º (reverse) • Power requirements: Switchable, 115/230 VAC, 50/60 Hz • Dimensions: 10" W x 7-3/8" H x 2-1/2" D; Cutout dimensions: 9-1/4" W x 6-5/8" H. From: http://www.parts-express.com/yung-sd300-6-300w-class-d-subwoofer-plate-amplifier-module-with-6-db-at-30-hz--301-510 Do you think this model by Yung is a good match for my SW-12? Quote Link to comment Share on other sites More sharing options...
jason str Posted January 24, 2017 Share Posted January 24, 2017 Way too much power. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 24, 2017 Share Posted January 24, 2017 This one is 200 @ 4 Ohms which would be closer to your old amp at 8 Ohms. The boost is at 35Hz not 30 though. http://www.parts-express.com/yung-sd200-6-200w-class-d-subwoofer-plate-amplifier-module-with-6-db-at-35-hz--301-506 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 24, 2017 Share Posted January 24, 2017 It's too bad they don't list power @ 8 ohms. The one you linked might be close too. Maybe a call to Parts Express would help get those numbers for you. Quote Link to comment Share on other sites More sharing options...
jason str Posted January 24, 2017 Share Posted January 24, 2017 Good catch, the driver is 8 Ohms, the 300 watt should work. My question would be is if an 8 Ohm driver changes the boost frequency of the amplifier. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 24, 2017 Share Posted January 24, 2017 No idea. Quote Link to comment Share on other sites More sharing options...
jjptkd Posted January 25, 2017 Share Posted January 25, 2017 I've used a BASH 300 in an SW-12 before and it worked perfect and sounded better than before. http://www.parts-express.com/bash-300s-digital-subwoofer-plate-amplifier-300w-rms--300-750 If you watch eBay they pop up on sale some times, believe I got a new pair a while ago for $114 each IIRC. Quote Link to comment Share on other sites More sharing options...
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