I am amazed by all the teases and laughs, I just wonder if that's due to my patience to play with props or what. Nevertheless I would post my log here:
Purchased. Bad plastic smell out of the box, sound great but definitely need time to open up.
~70 hrs, got better
~100 hrs, better but still muffed
~200 hrs, much better but can hear the stiffness and tightness of low and high
~300 hrs, really opened up mucho better. Everything's there.
~450 hrs, soundstage and extension got truly better.
~600 hrs, with high volume running thru last night, things got much better
~750 hrs, high volume cont. There's still something...
~900 hrs, need a better amp (than Fiio E9).
I guess volume/ sound pressure definitely play a role here. My listening and run-in volume is much lower than average cans lover around (at max like ~50% only). Afraid of "breaking" the drivers, it wasn't until nearly a month later I raised the volume to average listener's level, and that definitely make a difference. http://www.hkvwet.com/viewthread.php?tid=45703&extra=page%3D1&page=1
However, I do not find the lower end gears need this long time to open up. PX-200 ii, DTX300p, MX580, DTX100 and others I've played with and forgot, 100 hrs is truly enough and things hardly improve after that.