My experience with the "buzz" has been from the ground loop. To get rid of it, I used the "cheater plug"....those 3 prong to 2 prong adapters which you can get from the hardware store for less than a buck, not the safest solution but it might be worth a shot. Another alternative is to take a piece of wire and tie it to the case of all your components..ie receiver, cd player etc. There's also a cheap radio shack fix if the buzz is from your cable tv.