I have a pair of sennheiser hd 558 that were okish for a while. Last night I was listening to music and the left driver blew because i was overloading it with dubstep....poor thing....but something good came of this.   I always wondered why they used plastic drivers, plastic frame and cone and all in headphones. I still cant find a concrete answer and Ive always hated how muddy they sound with mids to me.   So I cut out most of the plastic and had four little 2...