Well I received my HD558 yesterday, I am listeing to them and I think are amazing but in some songs I can hear a rattle in the left speaker, I am not sure if is something of the plastic of the headphone body or the speaker itself, any idea?
Should I continue testing those?
Do you think I am in some way abusing of them? I dont have any amp connected and in order to listen the rattle I need a high volume, but not too much at least in my opinion.
I think you may be describing a condition known as "clipping". You can read more about it here: http://en.wikipedia.org/wiki/Clipping_%28audio%29
Oddly enough, my HD 595s seem especially prone to a condition similar to this. Not sure if it is a problem with my 595s or if it is clipping but it seems to do it on bass heavy tracks at higher volumes.