Velodyne Sub Wooder is not responding to its remote

SOURCE: dd-18 no sound coming from it...

You could try disabling the auto-on feature or you could try a factory reset or firmware upgrade.

Swap the wires between subwoofers to see if its the wiring.

If its no longer under warranty you could try swapping the amp modules or the fuses, this will tell you if its a fuse or the amp or the driver... however by doing this you risk blowing up the second working amp or voiding warranty.

Last year I had an amp failure on my velodyne and it cost 250 for a 2007 replacement.

SOURCE: Velodyne sub woofer: Series S Model: VA08BVX10

The volume control pot can be replaced.

Any good quality audio shop or electronics repair shop should be able to fix this.