AVS Special Member
Join Date: Jul 2009
Location: northern virginia
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Some subwoofer amplifier fuses are on the amplifier board rather than easily accessible from the rear. If you do not have a fuse that is accessible from the rear, then it will be on the amplifier board.
To get to the fuse, you must remove the amplifier board. If the fuse is defective, then replace it with the proper fuse (Radio Shack and other places carry the correct fuses). If after fuse replacement, the amp immediately fails (i.e., the fuse blows), then you have a defective amp. A common cause of amp failure is with the main capacitor (or capacitors) which can deteriorate with age and heat.
An amp repair can cost $200-300+ with a 30-90 day guarantee on the repair.
Klipsch (which has changed hands) may be able to offer a replacement amp or a repair where you send in only the amp.