This seems to be the general consensus from reviews all over the net, aside from amazon which I've found greatly differ from better sources. Anyway, while i have any but audiophile grade ears, I don't find these phones to be too dark or overly bassy. Bump in the lows? Yeah, but it's nice. Also the highs are much more extended and shimmering unlike my HD 280 pros.
My dilemma here is I've ordered some dt 880s because of the 770 supposedly not have much soundstage, being bass heavy and not very accurate. I find them to have excellent separation of instruments sounds. They each have there own space and vocals seem to float on top of the mix. My 280s sound obnoxious and lifeless in comparison, and that's saying something as I'm a guy who can't tell the difference between a 256kbps mp3 and flac, at least not with the sennies....I've also just picked up a pair of used grado sr60s, older version not the 60i. They sound nice, the midrange is there but a lot more pleasant than the sennies. The 770s still own them all in terms of pleasantness and, no kidding here, clarity.
So until next week when the 880s arrive I'm hoping to get your thoughts on the matter. like I said I'm no audiophile, and any help from you folks would be much appreciated.