As amps are close to where Sooloos audio source would be located then your plan of using MS200 makes more sense. I would however investigate use of 3.5mm(?) jack plug though for analogue out. I have no experience of this other than rightly or wrongly concluding that 3.5mm jack plugs was never a good option for high quality connector but other MS200 owners can give their experience.

As for using Prime power supply, I would double check with dealer that powering 5 simultaneous MS200's will work ok.

As for 192/176 problems. Do 96/88 play ok as I am confused as 192/176 files should not appear any different to a Sooloos audio source than a 96/88 file due to core down sampling.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).