Have you contacted Velodyne? They may send you a newer amp to swap out. Or purchase a rebuilt amp from them. I had a HGS 18 inch sub and i took it to the factory direct (about 2 hours from where i live) they fixed it and upgraded it very cheaply (cost wise). and i had it back with in 1hour.
Velodyne DD15 - worth repairing the plate amp?
The amp in my 2008 Velodyne DD15 is dead as a door nail.
How good is this old marvel compared to today's offerings?
Worth investing another $500 (to have amp repaired, incl roundtrip shipping, tax, etc)? Or just use as passive sub?
How does it compete to modern subs, for example SBS SB-2000 or SB-3000 (both under $1k pre owned)?