Quote:
time to get a soudncard then
Im porbably getting an asus xonar d1
Hmm... possibly.
Distortion is an odd thing. Like sibilance, it can be caused by many things... including your own ears. I know that certain frequencies will cause a painful resonance in my ears that I am extremely sensitive to.
That, however is probably not what's going on here.
Anything in the chain can be causing this, from the original files, to the M50 itself, and while I haven't read many reports about problematic cans, I'm sure like anything else, a bad set is possible.
Since it seems 'Left' oriented only, have you tried flipping them around just to eliminate your own ear?
Have you listened to a Mono recording (or somehow switching an amp to mono) to be sure the same signal is being put to each side? How about other rigs... have you tried them on a friend's system to eliminate the M50 as the issue?
Once you eliminate your own ears / cans, then yes... the rig or parts thereof would be the next place to look. My Xonar STX is amazing, and I can certainly recommend that, but there is also the option of an external DAC/amp. Can you output a digital feed (S/PDIF) either coax or optical (Toslink) from your computer? I do that with my laptop and feed my DAC1 with an optical-digital feed. The sound is amazing.
Anyway, sorry to hear you're having issues, and there are so many variables, it's hard to know which one could be causing the problem.
Good luck, and let us know how you fare.