According to the Wattsup readings, The Power Plant 300 draws about 40 watts with nothing connected to it, about 43 in multiwave mode. My Pass Aleph 3 draws around 200 watts at idle (196 acutally, although I think the PAss docs say 250). Plugged into the PS Audio, the total draw is just under 300 watts. Which suggests that there is some additional overhead in there somewhere (more than 200 + 40), but not a doubling. I'll move some equipment around later and check a few other components (including my Pass X-150 ). --Dan