Too bad this thread started last year.  I would be interested in seeing the waterfall plots of the DT880-250 with a 120ohm output.  In general, I prefer Beyers with a higher output impedance.  That includes the lower line DT440/DT660.

i think it was you that first suggested i try adding an impedance dongle to the DT990 years ago.  i did prefer them them with 110R output.  i recently added a separate 100R jack on my B22 for my K701.

Whoaaaaa. I just had my buddy give me his old DT770 silver velours (since he's hooked on the J$ pads right meow) and I put them on the DT880's and they are totally different pads. They feel the same, look the same, but the foam padding used on the old DT880 pads (as seen through the holes on the underside) is black while the new DT770 pads have a white. I didn't think anything of it until I started listening to a few tracks with the DT770 pads... The bass immediately goes through the roof and drowns out the midrange. Since I hadn't ever heard of Beyer making revisions on the pads, I started thinking I had some sort of software EQ on until I finally switched back to the stock pads and everything is back to normal. Is anyone aware of these differences? beyerdynamic-usa.com only carries one set of silver velour pads and they are the "EDT 990 V" while Amazon carries both the 990 and 770.

I guess my main question is if Beyer simply changed pads with the newer version of the DTXX0 series, or is there a EDT880 out there that I'm too dumb to find?