If they can do it under level matched DBT protocol, then it will have some meaning, otherwiase, as anonymous stated, zero. But, comparing other than sonic aspects is not a problem.
The general word in the audio community
Does that have any meaning? Any validity? Credibility?
is that Yamaha has a 'bright' sound, whereas Denon has a more 'smooth' if not refined sound.
Then this would show up in the specs.
I have owned a Yamaha RX-V1 and loved it (although I can understand why some would consider its extended top end and detail to be bright).
Why is that? Is the frequency response reflecting this? Or, just a biased outlook on this component?
Do the Denons however, shave off some high frequencies to achieve their smoothness?
This would sho up in the frequency response too. I just don't see this is the case.
Do they compromise resolution to avoid sounding 'bright'?
Hmm, how is resolution measured? Which spec reflects this?
And can the Yamaha's alleged brightness be tamed by room treatment and EQ?
Ah, alleged is the key, isn't it
(And are the above 'leading questions' of the type that would be snuffed out by objections in a court?)
No, but a bias controlled listening comparison would shed light on this. Will it be enough to bury the urban legends? Of course not. Will it change your mind permanently?