[carrion crow]

Thanks for your reply.
I've already checked the cable by testing continuity between jack and solder onto the drivers, and it seems to be OK.
 
It's weird because I don't carry my headphones, it still on my desk all the time.

 

[carrion crow]

Hi,
 
I've made a test :
I've put balance sound only to the left channel and put a piece of metal between right and left connections onto the left driver. Sound comes out normally on the right driver. So I think it's definitively not the cable (sad for my wallet I think).

 

[carrion crow]

Hi,
 
I bought a driver (~80€ with shipping) from showcomms (not available from beyer...) and I replaced it. It works perfectly now.