Ok here's the situation. I just replaced my B&K Ref30 with a Lexicon MC-12. The world is great except now I have a hum in my sub. My setup is a SVS sub EQ'ed by a Behringer Feedback Destroyer. The sub is powered by a Crown K1 amp. This is the exact setup I had with the Ref30. I'm using the same power outlets going into my Monster Power HTS2500. However the problem seems to be with the BFD. If I take the BFD out of the connection and have the MC-12 feeding the signal to the amp directly --- no hum! Again this is same setup I had before and I only changed processors. What gives?? Suggestions??