My choice is for K701, GREAT headphones...transparence sound, great on VOICES and highs, HUGE soundstage all these better than DT990 (250 Ohmi version)...not so "great" on bass extension than DT990 (250 Ohmi version) but the bass is there, it's a little bit light, but it's present.
P100 it's driving relative easy this "hungry" headphones
P100 it's driving relative easy this "hungry" headphones