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Is anyone else out there having a problem with sub-woofer hum? Ever since I had my HR20 (with a 6x8 WB68 switch and B band convertor) installed I get a hum from my sub-woofer. None of my power plugs have a 3-prong connection. The noise is erratic. Usually in the morning I do not hear it, but during the day it get real loud. When I turn on my stereo receiver, the hums goes way down, but it is still there.

Any ideas?

Bob K.
 

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Chasing ground loops has been known to drive people directly to the nut house without passing Go. In a typical HT situation all equipment should be plugged into the same AC outlet, ideally through some kind of power conditioner. If the subwoof is in a different outlet or, even worse, on a different circuit you will often have hum problems. As an experiement grab a length of wire (speaker cable maybe?) and touch one end to the chassis (metal part) of the subwoof and the other end to a metal part of the chassis of your HT receiver and see if that changes anything.
 
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