I tried to teach it the words to no avail. Velodyne ULD 15, low hum when powered up, can't hear it when music is playing. It does not vary with volume on the servo controller amp. Any guesses what it might be? I tried different cables and checked connections.
get a Cheater Plug (unground the sub), if it goes away you have a ground loop problem. Unplug your Coax from your cable box and see if the hum goes away.
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