Fixing a blown subwoofer

First, Never try and fix a home powered subwoofer unless your qualified to do so. It has an amplifier in it that might casue severe electric shock even if it is unplugged.

There are parts of a car subwoofer that can be repaired. (as long as it is not powered). In this case your best bet is to go to a reputable site like Parts Express. There are many other sites out there that speaker repair kits. Searh Google for Speaker Repair Kits.

Try Parts Express as a great source for Speaker Repair parts.