Subwoofers unresponsive I was listening to some heavy-bass music the other day when my subs stopped working all of a sudden. Since then, there has been no improvement. The speakers still produce sound and the speakers and woofers work with other receivers. Is it possible that the part of this receiver that send the bass signal to the woofers has burnt out? If so, how can I fix it? Thanks! Steve

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Check the physical condition of subwoofer to make sure that the surround has not rotted out or been blown away. If ok, then using an ohm meter check for the nominal speaker voice coil resistance to make sure it is within spec. If both of these areas are good then you have destroyed the output stages of the amp(s) driving them. Every 3 db of bass boost doubles the output power. So if you are blasting along at 100 watts and you jack up bass by just 3 db the amp now has to put out 200 at those lower frequencies; go up by just 6 db and you are now talking 400 watts! And what does that do to an amp when you over drive it? You guessed it!
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