highnote

Thanks for the replies. I thought that I had checked the electrical connections as thoroughly as possible, but I was wrong again. I did have the two circuits on separate legs of the 220 main coming into the house. Doh! Once switched, the hum went away. I still wonder about the ground,though. Where does the shock hazard exist in that subwoofer? Seems pretty well insulated/isolated in my opinion. Any weigh-in from Klipsch personnel on this? Is a ground really necessary? Thanks again!

I have a Klipsch Sub connected to my Yamaha Home Theater Receiver. I have a ground loop problem between the two. If I plug the Sub into the same outlet as the Yamaha, No Hum. If I plug the sub in across the room (which is where I want it!), moderate hum. I found I could eliminate the hum by cutting the ground wire out of the power cord on the Klipsch Sub. Works like a charm. Question(s) is(are): what risks am I running by using the Klipsch sub ungrounded, and what other noise reduction approaches could I use if the risks of this approach are deemed unacceptable? Thanks for your help!!