i posted a few weeks ago, that my second pair that came in couple of weeks after my first pair, sounded just the same ootb as the ones i had with a couple of hundreds of hours burned in. look at my sig. burn in is nothing but a myth. maybe there are some changes during first couple of hours, but thats all about it. no matter if the diaphragm is cnt or biocellulose or what ever. if it would do change the sound, why should it always just turn it better and never worse? and why should the companies not sell already burned in sets than? thats why other forums call this place hype.fi. its the same about scary voodoo cables, that are able to turn a k701 into a hd650. nonsense, if you ask me.