Well finally connected up my minidsp SHD to my brand new March Audio p452. Streaming flac from a raspberry pi 4 to my Monitor Audio Silver 8 speakers, it is hard to think of much that could be improved. I will be adding a sub later on but boy, this is a killer setup. The p452 is more quiet than any of my previous amps and blows my old Class D Audio SDS470c away in terms of low noise. It is dead silent. Its so weird, even at high volumes there is just absolutely no amp noise. Do not even know if the amp is turned on, the music just suddenly appears out of the speakers. I could go on about how it sounds but it doesn't really sound at all. It just plays music really well with low distortion, which is exactly what I want. I think this is probably my end game amp. Cannot see me ever wanting to move on from here, unless it dies, at which point I will look for the latest Class D technology, which will no doubt have move on into ever increasing low levels of distortion and high levels of power.
Thanks Alan and Team Bruno, killer amp at an impressive price point. Highly recommended.
PS One minor issue, I seem to struggle to reliably turn the amp on and off with the piezo switch. Will need to work on the correct amount of time and pressure to get it to work every time. Took me a few depresses to get it to turn on. This is minor though and likely just me.