Oh, is the sub one of those integrated units that is also the amplifier for all the little speakers?
I was suggesting unplugging the audio input cable. I'm not sure what yo can do in your case. I'd start by unplugging everything but the power, and see if it does it. If it keeps doing it, then it is something inside, and unless you want to pay for repairs, it is probably toast. If it doesn't, plug one thing in at a time until it does it. Then you can see if it is a bad cable, or speaker.
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