You have a ground loop issue you could purchase a ground loop isolator, jensen makes them for about 40 bucks.I have discovered that if you have cable tv, unplug the incoming cable in your cable box and see if hum disappears.
Actually, I think this issue is caused by a bad filter cap in the internal power amplifier as it hums when I plug the power cord in. I don't have any RCA input connected, so there cannot be a ground loop.
So if you have hum, first unplug all RCA inputs to make sure that the hum goes away. When working correctly, the subwoofer should be silent with no RCA input connected.
I'm having my unit checked out my a local electronics shop...will post the results.
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