After adding a power amp to my HT, I experienced a buzzing noise which was addressed by a number of people of whom I am grateful to in a previous post: Thread- Added a power amp now HUM and BUZZ- HELP! Well, the cheater plug got rid of the buzz, but due to safety concerns regarding the loss of the ground, I took it out. I have tried connecting a ground wire (using speaker cable at the moment- is this OK???) between the amp chassis and the ground wire screw on the Denon receiver (which has a 3-prong plug same as the Rotel amp btw), and this has significantly reduced the buzz to a point where it is just audible from the listening position (although the cheater plug made the buzz inaudible). Can anyone explain what has just happened? Are there any other things I could try to eliminate the buzz completely without using the cheater plug? Although the buzz is reduced, it is still annoying. Thanks for the help, Mike Edit: I should add that connecting the ground wire from amp to the DVD player reduces the buzz the same amount as adding the ground wire from amp to receiver. Again, if I unplug the DVD player then I get no buzz. Strange this!