I have a "dual mono" amp. That is, two completely independent amps in one box. Would it sound different if I put a channel into another box? I doubt it...
More important is the power supply itself, rather than the box(es).
Another observation is that monoblocks tend to be at the higher end of a range, and are more likely to have bigger power supplies vs. stereo equivalents.
Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.