OK... So I had both the DT1770, AND the DT1990. I thought that I could ‘manage’ with one or the other, and since I used my 1770’s for commuting, I thought that I could get-away with selling my 1990’s, and keep the 1770’s for both home and mobile use. After all, the 1770’s are probably the BEST closed-backed cans I've owned. How wrong I was... However great the 1770’s are, they can’t replace the ‘magic’ that the 1990’s bring to the party. My SECOND pair of 1990’s are on their way to me now... Sometimes I HATE this ****ing hobby!