PS Audio Power Plant P3 to P12

I owned a P3 and almost immediately upgraded to the P12. I used the P12 for a few years and I really didn't know why I was never totally thrilled with my system. I made a ton of other changes during that time, so I thought it must have been my newly converted fiber optical LAN or cables or something else that was causing truncated highs. When my P12 went down for a 2nd time (noisy fan) and I had to send it in to PS Audio, I wanted to try something different. So I ended up on an AQ Niagara 5000. Immediately after I plugged it in, I noticed my treble extension had returned and dynamics were fantastic. Far better than the system with the P12 inserted. Needless to say, the P12 was sold after I received it back.