Originally Posted by Maxvla
You aren't sure because you haven't tried it. I didn't expect it when I got my first IEMs, the MEElectronics M9 which sound like crap but had this amazing 3D holographic soundstage. I quickly looked up in quality but wanting to retain that 3D feeling and got the RE262 which I used for about a year til I got these customs. I don't know how they do it while not being open, but they do.
Not sure what you mean on the setups comment. If you are putting an HD800 in your system you need good power. The minimum I would expect to sound decent would be in the $500 range. The best I heard it on was a $5000 amp, but not far behind was one around $1000-1500.
I came from IEMs (W4, TF10, UE700, SE425, IE7, etc) to headphones and almost purchased a custom myself. About the 3D feeling, multiple BA IEMs do have excellent instrument separation. I think we're confusing the term soundstage here. Yes, instrument separation in IEMs can be close to high end headphones.
My desktop amp has more than enough power for the HD600, 800 even the DT880 600 Ohm but may lacks warmth which the DT880 needs.