http://www.amazon.com/review/R2EPJFWGPPWW5S/ref=cm_cr_dp_title?ie=UTF8&ASIN=B00CAG1ZAQ&channel=detail-glance&nodeID=11091801&store=musical-instrumentsMids and highs
Definitely there is a lot to talk about here. From what I discovered, there are two versions of the HD681 EVO's. The newer version comes with additional velour pads and a lot of little factory improvements (better rubber band, different vent covering material, etc.), the old version doesn't. The mids and highs vary between these two as well, mostly around the 5k range where there was a significant -db drop in the older version that has been since improved. The stock HD681 EVOs initially sounded a bit muddled, but after some break in, plus the mods, the sound became way more comparable to the ATs. The ATs still have the edge in sound quality and clarity, but for the price difference, I was absolutely impressed on what the EVO's were presenting to my ears. Besides, many EVO users have reported that these cans get even better after 100-150 hours of break in, so kudos to that.