I have been wrestling with these issues myself. I tried my Pass X-150 with my P300 along with my CD player and preamp. The X-150 is specÂd to draw 200 watts at idle and up to 600 peak. The two front-end components draw no more than 30 watts apiece. PS Audio said that the Pass probably would not work with the P300, but that I could go ahead and try itÂno harm would come, the P300 would just shut down. (Nelson Pass also said "no harm.") As you know, the Power Plants give a reading of how much power they are being asked to deliver. So with these three components connected, the P300 reads that it is delivering 190 watts (how can that be?). Now, it runs very, very hot with the Pass plugged in (I would need to purchase the add-on fan), but it works and it sounds mighty impressive. The top end cleans up and opens up like nobodyÂs business. However, my feeling is that there is some dynamic compression, which makes sense: the amp canÂt get all it needs. The P600 might be much better. So I think PS Audio is overly conservative in their advice about what you need and their warnings that the P300 is not for anything but the most modest power amps. I also think there is a lot of bad information floating around about the Power Plants (not from PS Audio). For example, some of the reviews have said that the unit draws 300 watts from the wall all the time, which is not true. IÂm not sure how much it does draw, but it depends on whatÂs plugged into it. This is a big concern to me. I like to leave my CD and preamp on all the time, but not if they are drawing a lot of power. By the way, I am currently not running the P300 with the Pass amp. IÂm not sure I want to add a fan to deal with the heat (I hate mechanical noise near the system) and the heat was making me nervous, though the 190 watt reading suggests that everything is okay. Dan Rubin.