Ok, here's the latest. I unplugged everything in the house. And I mean everything Fridge,microwave,etc. There was nothing plugged in the house at all. I shut off all ceiling fans. I plugged in the lex and the sub, no luck still hum. I used a cheater plug, no luck still hum. I plugged them in the same outlet, no luck still hum. I called lex tech support, got hung up on first time, called back got voice mail. I am running out of options. Would running dedicated circuit definitely fix the problem. What exactly does that entail(spelt right)? I have a electrician friend that I will probably call on this. All I want is clean sound. I'll even settle for just sound without a hum. The system works fine when I set up my reciever. AS soon as I hook up the lex I get the hum. Could it be a problem with the lex. It seems other people are having similar problems with their lex??