[Gibo]

I tried out both these headphones on the weekend and i found the 515 had more comfortable (deeper) cups. I lets more ear in and less contact with the base of your ear. Could you transfer or buy deeper or thicker cups for the HD555.

 

[luukas]

Try this mod, courtesy of gerG!

http://members.cox.net/yrogerg/headphones/phatpads.pdf