Have you considered trying Audioquest subwoofer cables? Each has a 3rd ground wire you can connect to a screw on the back of an amp or AVR for example on one end and and a screw on the back of your subwoofers on the other. This really does work well and it's eliminated the hum I was experiencing. I have two subs as well in my system. Another suggestion is to replace your contractor grade cheap electrical wall outlets with PS Audio power ports. I've done this and it does make a difference.
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