My Velodyne sub has worked perfectly for several years. I just moved to a new home and set up my home theater system. When I turn on the sub there is a loud hiss coming from the speaker. I already have a Mondial Magic on the incoming cable line so that is not the problem. I have disconnected the rca cables from the sub and the hiss is still there with only the sub plugged into the wall. Additionally the sub thumps when I turn it off. It is already set to the auto position. Is the subwoofer bad??? Am I missing something??? Please help if possible....
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The amp has a fuse mounted on the PC board. The fuse may be blown.
The speaker may be bad. that may have blown the fuse.
You can test the speaker with a "D" battery.
Take the amp section out of the back, disconnect the speaker leads.
Touch the speaker leads to the poles of the battery. it should make a little thump and the cone should move freely.
Look for the sub pre out on the back of your amp and connect a sub cable to this and next to the LFE or phono type input on the back of the sub ,if it has two inputs left and right pick the left side ,set the cross over to suit your system and speakers,if you are not sure set the cross over to 80 hertz,this is a thx standard.
hope this helps.