The cable on the M50s is 3 meters long, way to long to hear music from phone.
Would you guys aprove to cut the wire 3 inches away from the headphone itself in order to install a 3.5mm female jack or would I lost a lot of sound quality?
Even the coiled version is a bit too long for portable use.
I would cut the cable to length, and maybe leave a few inches, then terminate it in a 3.5mm. Practice on some crappy headphones before you do the real thing though.