For 2-channel, when your room is in question, start from immediate near field triangle, and work your way back and toe out accordingly. This will at least tell you what your speakers sound like and how they image, where it drops off, etc. If for nothing else, it may indicate a 'plan B' sweet spot you can move a chair into that really satisfies.
I don't mess around. I don't have time or want to turn my home into a lab, so I listen like this. The small speakers on stands I am currently listening to are rated at 175wrms. I am using a fraction of that to make 85db or so. There are also two subs back there. The two larger speakers behind them are rated to 500wrms, of which I am probably pushing 4w at most that close.
I currently have Molly Hatchet on cranked pretty loud and it's very good. Dire Straits "On Every Street" is next, perhaps Boston after that. Earlier I had Jean Luc Ponty on and holy crap. A different amp would not do any better for me. It's all about the speakers. As such, the old Denon AVR is a champ at this.
No, it's not fashionable but either am I but nobody else here cares so. . .selfish works when all else fails.