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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 noise but this rattling noise is only present when the sub bass is in use. When ever i press down on the right ear cup i hear a clicking noise in it. There is also a small crack on the ear piece. Not sure what is broken or what is causing the rattling noise from the sub bass. Please Offer some assistance