now my rkv with opa627sm could operates  very well without 68pf caps  could it operate well  long time for any headphones,for kk especially? thanks

as the title shown i have the portable amp predator.i have been looking for the headphone for it a long time at last ,i decide to buy one among the hd650 ,dt880 32 ou and the k701 but which is the best for predator? my music source is cdplayer ej01 usually i listern to pop musics,and...