I don't think it's the headphones, I can do max level with any headphones without distortion. I think it's more down to the source used and what volume level used on the source.
Unless you got a piece of hair that is laying on the driver starting to vibrate enough to produce that annoying rattle sound as the bassresponse gets stronger. So many times I've got false alarmed of the headphone drivers have broken when it's just a piece of hair. >_< This is very common.
Edited by RPGWiZaRD - 1/23/12 at 1:02am