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Help me know how I answered my own question!!!
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OK, sorry, I've been in such a rush lately...
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he said to just get a couple "cheater" plugs, which I did, and the hum is still there...
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Can you tell me where you tried the cheater plugs and the results? Did you try one on the BFD itself, and what was the effect to the sub hum?
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When I plug in and power up the BFD it has its own hum from the unit itself
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By this you mean a mechanical hum from the metal case itself, and not from any speakers? This is another issue and certainty not related to the addition of an external power amplifier.
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When I take it out of the loop and just fire everything else up the speakers still hum--but the SVS doesn't.
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Are you saying that if you leave the BFD in the sub circuit, that it also hums in addition to the new hum you're getting from your main speakers?
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You just answered your own question
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This comment was to indicate that the nature of any properly installed ganged box is that each of the two receptacles in the box will be powered from a seperate circuit. Each circuit will be on an opposite leg of the service panel. This is a recipe for a ground loop.
As a test, unlug your entire HT except for the power amp and receiver (being used as a preamp) plus the sub and BFD. Plug these things into a single receptacle and see if the hum is there. Granted there may not be enough power to run your whole system this way, but it's a test to see if powering from a common leg will remove the hum.
brucek