Hmm, I'd never say 990's have thin mids in my setup. In fact, in a direct A-B comparison between DT990Pro and AKG K701 which is known for its forward and full mids, plugged into the same headphone amplifier with two outputs, the vocals, especially male ones, actually sound fuller and more present on the DT990's, and instruments like pianos, guitars, especially saxophones, have just as much if not more of that sweet full mid end to it that I get with the K701. To me, DT990's sound TOTALLY different than they're described in most reviews, even in this sonic differences guide. To me they're not bass heavy, or very bright, and they definitely don't have recessed or thin mids. I find their bass perfect in amount, just slightly more than K701, to have a bit more punch, but too much, to make music boomy, its always tight as you say. And the boost in the high region is not in any way offensive to me, it just adds a bit more clarity to the sound, but highs are very smooth and not harsh at all in my setup.