Ok i didn't get the grado 1/4'' to 1/8'' adaptor. I got my money back for the faulty jack and the guy at the shop gave me one that works good for free. The quality of this jacks he had is a bit less than average, so I will check for one at Media Markt or some place like that that I bet will be cheap, but better i hope.
Now I am in Burn in process (39 minutes burn in to be exact at the present time). It is unbelievable how good the cowon D2 handles this headphones without any amp. (The Sansa Clip can handle them but not as good as this one, and the Sony A829 is a bit behind the Cowon D2, not a large margin though).
Even if it has barely burned it listening to metal with this cans is amazing (and will keep getting to better) I will get my Fiio E3 & E5 soon (think during this week) and lets see how good they do.
Bass is good enough for me, i have realized that I am not a Basshead, even if I might try the tape mod with the bowls. They are quite comfortable and this headphones deliver more sound than expected; instead of putting the volume up as I do with my shure se-210 I am lowering it.
Listening to FLAC @ 44kHz Already discovering new sounds I couldn't listen with the se-210.