Very Loud Hum Even With Isolator and Nothing Connected

I have a Creative 6.1 6600 speaker set.
The speaker power supply is hooked up to a very nice 4-level isolator.
NOTHING is hooked up to the subwoofer other than the power cable and volume control.
Yet when I turn it on, the hum is still loud enough to be heard everywhere in a fairly large house.
I've almost given up hope on the issue. I've ran out of ideas and am ready to just throw the woofer out as being broken. Any final suggestions before I scrap it entirely?

If it's humming that loud with nothing but the power and volume control hooked up, then it is probably bad, and you should check into either warranty service, or a new set of speakers. Sorry.
Good luck!
Dale

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