Got a pair of 600 ohm DT 880s in the mail today from Amazon.
- much smoother frequency response than the Grado 325is
- soundstage feels a bit wider, probably because the drivers aren't pressed against my ears
- overall comfort/wearability is much improved
- with as much as people gripe about the Grado styling/build quality, however, I'm a bit surprised at how lightweight (borderline chintzy) these DT 880s feel. My unit also has a misshapen ear pad that doesn't fit snugly, so these will be going back in exchange for another pair. I was hoping to have a more substantial feeling set of cans -- not that the light weight isn't a good thing in a lot of ways, but the Grados felt SOLID from the housing, all the way down the cable to the 1/4" plug.
Obviously, they do require a TON more drive from the amp to reach the same volume level as the Grados, and I could see some people nervous that the D100 wouldn't be capable of pushing enough volume. Of course, those people are already half deaf. But still. If I can totally crank the amp and not explode, that should tell you something about the output of the D100's head amp.
All in all, a substantial improvement so far!