I had less success with power amps, the first one up was ATC’s substantial P1, a 150 watt class A/B taker of no prisoners. Putting this on the high current output made for a larger soundstage, but it lost dynamics. Some of the grip that this amplifier is so good at exerting had diminished. A similar experience occurred with a Leema Tucana integrated. It’s a similar amp in some ways, and one that had better leading edge definition and perceived transparency without the P5 between it and the wall. The regenerator made both sound cleaner, however, and this might appeal to some listeners. Quite possibly the higher output of the P10 Power Plant with its 1500 VA output would be better suited to high power amps.
I can highly vouch for the P5 with preamps, DACs, streamers, phono stages and pretty much anything that does not have to drive a loudspeaker. It brings a delicacy and finesse to everything it touches, Herbie Hancock’s piano on his version of ‘Court And Spark’ on The Joni Letters [Verve] had so much subtlety and feeling that it seemed in-room real. Streamers really benefit; it’s like going from 2D to 3D with some records, like bringing the venue of a live performance to you, which is far more intimate and achievable than going to see your favourite artists if that’s even possible. I’m less convinced with power amplifiers, but my particular power amp choices are rather ‘meaty’ and likely require a larger and more powerful Power Plant.
I can see why AC regeneration put PS Audio so firmly back on the map. The results it delivers with the P5 is a high value means of getting the most out of a decent system. They used to say spend ten per cent of a system’s cost on cables; I’d say you should spend even more on getting the mains right. It’s the crux of high resolution audio.