They are actually referred as "5.1" headphones...
Wasn´t ultrasone developing some 4.1 (I think 4 drivers in total in two ears)? What happened to that?
Otherwise this is the wrong forum to ask about such a thing it´s like asking which bose headphone you want I suspect thus all these elitistics remark
. I can´t recommend any 5.1 headphones for you either
. I just didn´t find they give me a better 5.1 effect then stereo headphones... But if you want a 3d perception of music I would go with some Ultrasones. The Prolines anyway are superb with bass as well so you would certainly get that.
DT 770 PRO is really nice for Trance as well and is a bit cheaper... But you do get what you pay for.