This seems like a conundrum really. The RN803 is a really nice receiver, more or less future proof and well built.
Yet in a slightly larger room the power supply doesn’t allow for the dynamics we want ( and that the m80 hp in this case can deliver rather well I bet ) / power supply that in a room that is a bit bigger would need and use.
It seems like the division point is around 100 watts for the elegant one box solution and separates. And to get that next 3 db bump you need another 100 watts and then 200 for another 3 and so on.
So it seems you / we / anybody / decides on “ good enough “ or jump all in, or use a smaller space but don’t put too big a speaker in the smaller space.
The middle ground of bigger watts in an integrated with 110,120, or even 200 watts are few and far between and rather expensive but be just enough to give the headroom desired for space and preferred spl.
Is there an argument to be made for capacitance though? That 100 watts rms with 12,000 uF is less effective than the 90 watts rms with 30,000 uF behind it. So the question is how much is enough? I think the higher the capacitance the better ..... or do you lose something with too high of capacitance?
See, conundrum.