Sean, are you sure about that? How much voltage sag are you talking about? I know that power in many parts of the States is hit or miss in terms of keeping it to a decent spec, but how bad can it be that the power output of the amp can be throttled? I guess if one believes that nicely polished wire can produce audible benefits on the music coming out of one's system, the sagging voltage would be many degrees of magnitude greater in its negative audible effects. I still think that a dedicated circuit is a good idea if it helps to reduce the nasty influence of refrigerators , air conditioners and the like turning off and on. BTW, why is added filtration, conditionning etc of the ac required in the case of power amps with the large transformers and caps used? Oversizing components for sonic benefits seems to be a big part of the high-end. Did you notice that gigantism in audio components started as an American phenomenon, and has spread from there. Does anything in audio ever get to the point of insane overcapacity? The continuum is big, bigger, biggest, best. Once in a while a curve or sinker is thrown in for good measure, such as the odd skinny wire. BTW Bryston is of the opinion that their power amps do not benefit from the extra filtration etc.: just plug it in the wall socket and enjoy.