AVS Special Member
Join Date: Jul 2009
Location: northern virginia
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To fix it, you would like need the service manual. Sometimes, if you Google enough you will locate a site that has the manual (many cost $15-$25).
For the actual fix, you would need a volt/ohm meter, soldering iron, and a solder-removing tool.
Many repair shops charge $200-$300+ for the repair and only guarantee the work for 30-90 days.
A very few individuals have been lucky in that they had an obviously bulging capacitor that needed to be replaced. In that situation, you are still better off replacing all the capacitors (but often do not need the service manual for the repair).
In the under $300 range, individuals like the BIC PL-200 subwoofer. You need to check its thread for how to get the best price.
"Is this replaceable". It is straightforward to take out the subwoofer plate amplifier. If you have an exact-size replacement amplifier, then it is straightforward. If you cannot get an exact-size replacement amplifier, then you need to do cutting-and-pasting that may not be very straightforward. Many proprietary subwoofer amplifiers have a built-in equalization curve that compensates for some of the frequency-sound-level characteristics. A generic amp from Parts Express or OAudio would not have the equalization. The OAudio unit does have a parametric equalizer.