Another victim here.
I too have the same problem as OP. I tried to Google for a solution and ended up here. Great site BTW..
At first, when I bought this sub about a year ago, I have no noise or hum from it at all even when system on w/ high vol. Recently, there is a constant buzzing so loud when it's on. I disconnected every thing accept the processor and dvd player, still same problem.

I emailed tech support but still wait and see...
