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.
Sometimes if your sub is on the same curcuit as the lights (especially with dimmers or 2 or 3 way switches) it can cause a hum. Turn off the lights and see what happens.
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