AVS Special Member
Join Date: Jul 2009
Location: northern virginia
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Subwoofer repairs can run $200-300+ and the sub is returned with a 30-90 day guarantee. You will need to pay shipping to-and-from a repair facility.
To do a repair yourself, you would need the service manual (with its circuit diagram), a volt/ohm meter, suitable soldering equipment, etc. Many manufacturers consider the service manual to be proprietary.
You could check with Velodyne on whether it is possible to purchase a replacement amp.
You can consider a replacement plate amp from Parts Express but none of their amps would be servo.
You could consider an Epik Empire (dual 15") subwoofer or some of the other high quality sub offerings in the under $1000 range. The Hsu VTF3.4, Outlaw LFM-1 Ex subwoofers are quite well regarded.