There are a lot of folks who've had power supply issues with this sub. Typically, the large resistors fail, which takes out the capacitors.
If you know how to read schematics and replace parts, then these might be helpful to you:
Here are the two pages of schematics from KLH. I wrote to their techdepartment and explicitly asked for permission to share them here.
Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower boardHere's the upper board:
KLH ASW 10-120 subwoofer schematic - upper board
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