Do the experiment, take them all out of the room. Report your findings.
Did that experiment decades ago....and frankly can’t be bothered to haul stuff into my listening room at your command. Was actually curious what exactly your experience was....were veils removed ?....did the sound-stage extend beyond the room?....was there a frequency specific suck-out?....was there a frequency specific glare or overhang ?....will you actually answer the question originally asked ?