Bob_reynolds is exactly right.
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Twb2, if I understand you right, you're suggesting that I make myself a long extension cord? I can hard-wire a new outlet close to where the sub will sit with about 2 hours of work chiseling a space in the brick to place the box and then fishing the wire down to the basement. This would definitely be my preferred method of handling it, because it's safer and more aesthetically pleasing (just in case one day I have to consider the WAF).
Bob Reynolds, have you experienced the hum when they weren't on different circuits? I'm just trying to get a sense of the probability that I'll have to deal with this.