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I have a Paradigm Cinema CT Subwoofer Amplifier. Whenever I turn it on,
or put it in Standby, it is fine at first, but then after a few minutes
of the TV being on or Cd playing, it will make a "thumping" sound,
almost like a fast heartbeat sound. It even makes this sound when the
cable is unplugged! (I mean, when it is only plugged into the wall and
not into the receiver). I have brought the sub into another room to see
if it is an electrical issue, and it still thumps!

It started out of nowhere one night at 3 in the morning. I brought it
in to be checked where I bought it, and they can't seem to find
anything wrong with it. Any ideas, I'm tearing my hair out today
listening to music with no subwoofer!! HELP!!

Thanks!
Me