I think I am making a different point - I frequent 5 concert halls - Barbican, Royal Festival Hall, King's Place, Wigmore Hall, with Royal Opera House for operas...and while different halls have a different sound, there are many sounds on hifi gear that do not belong to any of these halls. Plastic timbre, rolled off sounds, etc. One of the reasons I like restored Apogees so much is that the bass exists in space - not in one or two woofers.
I am not talking of the mic and the recording at all. If I choose a variety of recordings, listen to a system, and don't feel close to one of those halls, the system is out. If I enjoy it, it means it is playing to my ears calibrated at that hall (at least that is my interpretation and the way I go about it). If the recording engineer has screwed up on one of the recordings, it should sound bad everywhere and will probably not form part of the audition set.
As for the rig being adjusted slightly, this can be accounted for by multiple demos. I have heard many bad sounding Apogees. If a Koetsu has consistently sounded rolled off to me, best for me to avoid.
One can also have a range of preferences - stats with valves sound more like Royal Opera House. Horns sound more like brass. Apogees + SS sound more like a full symphony at the barbican, and give me the baritone's chest more than stats.
I should add that sometimes letting through the recording by keeping tremendously low noise and taking out color, like Mike L does, can add to the realism by letting the recording flow through, but the only place I saw that work without causing sterility was Mike's place