
Yes, either closed back or open back would work in the situation I'm using. Do the SRH840s have good separation? I read a couple of times that the HD558s have wonderful separation, I want the present bass of the Shures, but the separation of the Sennheisers, which is why I'm asking, because in the reviews I've read of the Shures, no body really talk too much about the separation. I also figured if there is just a better headphone in my price range for my needs, that I don't know about, itd be smart to ask here.
Separation (left to right) is excellent on both. However, I think you're trying to get to sound stage--the 3D imaging of the music/sound. If so, a good open can, like the Senn, will almost always have the advantage. Closed cans generally give you much better isolation from outside noise and don't leak any/much of what you're listening to wherever you are.

























I think my ears are really sensitive to treble, both my Koss TBSE's and V6's have some sort of peak in the treble which I'm trying to stay away from. I'd like to stay away from thin sounding headphones like the V6. I just want to see what options I have and whether I should buy another headphone. 


