There's considerable value in "how clean the audio is & how much space it has".
Metal band, over a bad PA, in a horribly-designed sound stage... ie pub rock.
Not a hope you can hear anyone even yelling in your ear. Pain will arrive before intelligibility.
Let me put forward a testable theory, based on an album that was notable in its time & I later learned that even 10 or more years later was on college sound engineering courses because of the 'space' that they had managed to create.
The challenge is - on at least a half-decent system, not from YouTube on a boom-box or Walmart "hifi" - turn this album up so the walls & windows start to join in... then, standing in front of the speakers, hold a conversation with someone.... resist the temptation to raise your voice.
The album is The Blue Nile - Walk Across the Rooftops
I have never tested the theory from 'u-toob' or mp3, but I have many times tested it in a studio or controlled live environment.
You cannot make this album too loud to talk over, so long as you don't introduce distortion in your op/amp/speaker stages.
BTW... the 'pain-centre' of loud rock in a bad acoustic environment is 4k. Can't hear a damn thing if the PA is pumping 4k with distortion. 4k is right where the human voice does 'intelligible' - consonants.
...it's also where deaf sound engineers push the highs, because they can't hear them any more :/