Well I have a two channel speaker system and the sound does not seem
to come from the speakers. They disappear. I have a pair of Grado SR80's
and a pair of modded Fostex t50rp's and the sound clearly comes from the
headphones. I am looking for headphones that don't get in the way of the music.
I know that my headphones a entry level at best, and I am looking to upgrade.
I have been looking to find out all I can about the HD650's and the 600's. Short
of buying them I have to ask questions. Hope this explains my question.
Ohhh very tough to reach true speaker-like invisibility with soundstage and imaging for headphones. Speakers/Headphones is a bit like comparing Cars and Motorcycles respectively. You pay a lot less for a motorcycle that can perform as well as a high-end sports car... but the high end car will achieve those performance levels with greater comfort without you "feeling it"...
You may be better served going with HD800s then... closest thing to real speakers from what limited listening that I've been exposed to (and from other reviewers).
If not that, the HD650/600 are still very, very good and musical, but will still sound like headphones in the end (albeit I would argue when paired well in a good rig, would rival very solid speaker systems in terms of resolution/detail). If you want a more immersive sound, I would argue that going fully balanced amp/DAC with these babies is the best option (sadly that comes at a significant price jump compared to other top single-ended options).
EDIT: If you're not looking to consider balanced, my vote goes to the AKG 701/702/712 series for good soundstage at a more budget cost (though these ones can sound a bit more analytical)
Edited by joebobbilly - 7/31/13 at 9:09pm