Have you checked the connections from amp to speaker? My push-on clip came loose from the stud resulting in no sound. Simple fix.
Velodyne DD15 - internal wiring
My DD15 stopped working (just back from repair).
Took the plate amp out and checked both fuses (good), power going to the board.
I DID find 2 wires (3 pin and 4 pin) inside the box that were NOT connected.
Can someone tell me where they are supposed to connect to the amp?