I recently purchased a pair of sony mdr xb500 extra bass headphones off ebay(used) for about 50 bucks. They are incredible!!!, however i notice a rattling sound in the right ear of the headphone when playing music with deep bass. Normally i would think its a burst speaker because of the rattling...

I have been using the ath pro700mk2 for 3 weeks now. When I first used it I notice the audio in the right ear cup was noticeably lower than the left one. I tried it on other devices, same problem, my friends tried it and encountered the same problem . After listening to it for about 3 weeks the...