Amplifier for my velodyne cht-8 is making noises

manual is here:
http://www.velodyne.fr/index_htm_files/cht-8_cht-12_manual.pdf

I GUESS that the speakers are driven by an after market amplifier. An amplifier needs to be connected to a power source that is only on when the radio is on, through a relay.

So I GUESS that:

1. The wiring is incorrect. Or
2. If is has a relay, the relay is stuck.

send your plate amplifier in for repair to velodyne or to ebcelectronics

Yup, in its manual.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Velodyne-CHT-12-Subwoofers-manual/id/866dj583/t/2/

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Velodyne-FSR-12-Subwoofers-manual/id/866ag600/t/2/

Not that it would help.

Is the white noise present in the absence of an input connection, free-floating?

The amps in both of them sound like they

Check your receiver's speaker set up menu and make sure suboofer output is set to ON.

Follow the instructions that apply to your electronics -

http://www.retrevo.com/support/Velodyne-CHT-8-Subwoofers-manual/id/866dj581/t/2/

Disconnect the input. Does it stop? If yes...

It sounds like it's sensing a signal at its turn-on threshold. Figure out why there's signal present when it shouldn't be there.

Exactly how is it connected to the source? LFE-only or full-range signal?

It very well could be the spaker leads hitting the speaker cone.

You could check this by removing the amp section from the back.
Remove the screws at the very edge of the amp panel.

Sounds like a bad amplifier.

One of the input caps on the power side is my guess

best bet is to contact Velodyne for a repair or replacment