I'm sorry, but I was wrong, got my 901 back yesterday, listened with the discrete card again, (haven't listen to them for a long long time), switched over to classic card afterwards. The discrete card is hands down better, might try to give some more thoughts later.
Mind you I listen to discrete card at 1.4-1.6 (every click is 0.2) volume, so there really is no room to adjust the volume, its either too low or too high for me using iems, I'll stick with using classic card when heading out.
I might also try getting resistors for the headphone out and see how it works.
Edited by bowtung - 2/18/14 at 11:38pm