I was using a Quicksilver Audio Headphone Amp with the focals. Initially they sounded really muddy etc. I asked a few people on a head phone forum about that.
"I was surprised it took about 75 hours before they settled in.
I even went to Dealer compared my new with Demo version and there was a big difference. They need time to breath out. 75-150 hours."
After this response I just let them play for about a month strait not super high volume but loud enough without clipping. I would check in on them and sometimes they would sound pretty good and then muffled. It might be that I didnt burn them in enough. Not really sure. They sounded muddy and undifferentiated to me. I am still a little in disbelief because I think I am in the minority a lot of people cant say enough good about thses.