The LCD2 has by far a much more larger and more 3 dimensional soundstage than the HD650. The reason some misinterpret the LCD2 for a small soundstage is because a lot of recordings are close-mic. You hear this most obviously with backup vocals...ever noticed how many female vocalists literally touch their lips to the mic...the effect of that in music - is to make it like she is whispering in your ears.
Remember, the LCD2 is more transparent than even the HD800 (even in the treble - there is more articulation to hi-hats and rides and more definition - Don't listen to the naysayers that the LCD2 is less detailed in the treble). Your ears are where the microphone is.
But when called for - the LCD2 will portray a simply massive soundstage - the HD650 can't compete. When I posted about the song "November Rain" - it was an excellent recording - but I can clearly hear many of the individual samples and the processing and placement of each of those samples - I can hear the mismatch in reverb and noise floor to some of the samples...I will never be able to pick that up with the HD800. Yet it does not get in the way of the enjoyment of the track.
Overall the LCD2 is more effective at conveying the message of music to your ears better than the HD650, and even the HD800 at that.
I laugh at summit-fi when I read their posts...they seem completely oblivious to the latest research.
Agree, Im listening to "The Beatles - Help!" Toshiba-EMI CP32-5325 which is the best version Ive ever heard of this album and the sound stage is awesome.