well, ive got the dt770 80/ohm and non-darthed... very nice phones. i cannot see what is so unbalanced with them. they certainly have heaps bass, but not too much like portapro or maybe even ksc75, but for a big headphone, they have the most i have heard. they keep up with any fast music i have played with them, but if you have many trills from drum high-hats, they are somewhat fatiguing.
for a time, before i lost my source for a couple of months, they were the phones i turned to the most often: they attenuate outside noise, have impact, detailed and bright yet smooth in the mids. they are not unrefined headphones, but the lack some intimacy of their siblings: dt880. overall, very good, by far the best closed headphone for a reasonable amount of money that i have heard