My new Polk Audio subwoofer has a very low hum when plugged in and not in use. I bought a MP SW 200 WITH CLEAN POWER RATING to get rid of this hum without paying for a larger surge protector which I don't need. But the hum is still there. Boo-uu! On the other hand, the surge protector is fine, so hopefully it will protect my subwoofer.
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