jadem6, i'm pretty much w/ewe on this, except, i'd say not *even* in a dead room, but *especially* in a dead room. quality speakers and electronics have the ability to transmit this info if it's on the recording, *if* the info isn't smeared by competing 1st-reflections of a room, which will confuse the ear-brain & ruin these subtle cues. thus, my opinion that *no* sidewall reflections is key to a wide soundstage.
regards, doug