As far as "soundstage". If this industry wasn't braindead, they would take a hint and copy some of the housing design of the HD800 itself (I don't understand why no one will take this hint, and realize how such a spacious design does most of the "soundstage" work, more so than that failure of a driver design they've got going). With enough of a similar housing design, and EQ, you could easily get this "soundstage". I would wager almost anything, that if you were to transplant an HD650 driver, into a H800-style housing, you would get a similar-enough sensation, and basically an indistinguishable enough sensation if you EQ'd it especially.