When I had the Monster amp it indeed had the ground loop hum that has also seemed to plague the 7700 and 7500 due to the size of their transformers. A ground loop isolator from parts express fixed my cable grounding problem and I found the Monster as well as the 7500 to have a very low noise floor which in turn makes for excellent dynamics. If there is noise issues due to the LCD display it was not evident in my system.