Well first thing I want to say is that my equipment is about 10 years old. LOL now that that's out of the way. I have a Onkyo TX-DS575 5.1 channel receiver and i have a HTS -10 infinity surround sound system. Everything was fine until a couple of days ago when my wife came home with the kids. She heard this loud buzzing or humming noise when she was outside the door. She came in and the sub was making that noise. So she unplugged it from the wall. I got home and i powered it back on and sure enough it was loud, even when i turned the volume down on the sub. So i unplugged the the cables from my receiver to it and it still made the noise. So, there are no cables going to it and it is only plugged into the wall. It has a built in crossover in it also. I took it apart to look inside and there was only like one board with a power supply and transformer on it, and the rest i assume was to control the crossover and such. So you guys think the sub is toast or what? Thanks in advance.