It's a light, persistent hum. It's there even if the sub is just plugged into the wall. I think I was wrong on the warranty. Apparently the amp is only 3 years? I bought it Christmas '05.
The sub seems to works fine other than the hum. It's just noticeable and kind of bothersome. I can't unhear it. Cheater plug does nothing. Turning it off and unplugging it are the only solutions. I honestly think it started after my circuit breaker clipped one time recently. It's faint enough that maybe I missed until recently, but like I said, I can't unhear it.
I've contacted support. Hopefully I can find a resolution.
