I agree with those who feel that the room itself bears a great responsibility for soundstaging and imaging. I feel that the most important aspect in this regard is where in the room you place your speakers. I have experienced amazing changes in depth perception by a small, few inches, speaker moves into the room. I also have had great luck with close to corner placements as far as the speaker disappearing act is concerned. Also I have experienced greater imaging and soundstage by placing my speakers on the long wall of a room. This did not make any sense to me when it was recommended, but it was an obvious improvement.
Good Luck.
Good Luck.