JoeESP9
ESL's & tubes since 83
It's a complicated thing, but there's no doubt an overly lively room destroys imaging. You know your getting it right when the image opens up side to side and takes on convincing depth. Any more than that and the sound gets sucked out of the room.
An overly live room also sounds shrill and full of echoes. OTOH, an overly damped room sounds dull and lifeless.