I have been using PS Audio's Power Plant Premier for about a week now and have noticed that even after extended listening sessions, the AMR heats up considerably less than before. Interestingly, the Premier's display shows that the incoming voltage is almost always in the range 238-242 volts instead of the nominal 230 volts it is supposed to be. I can only guess the OptiMains, OptiLevel and whatever other cicuits in the AMR can go about their task much more easily and the chassis remains cooler, or am I babbling physical nonsense?
Btw, so far I am very pleased with the Premier: I can't detect any loss of dynamics or other sonic degradation.
Cheers
Karel