please answer only if you have actually used both. i am trying to decide which one to purchase. i will use them for critical listening as well as tracking/mixing. i already know the pitfalls of mixing in headphones and understand the problems of mixing with closed back cans. while researching the beyerdynamics dt770, i ran across this review: I have the m50x and the 250ohm version of the dt770, so i'll give you my impressions with the 250ohm version in mind. I've heard the 80ohm a few times, they're very similar sounding, a bit more bass impact and a bit less aggressive in the highs, but the overall sound signature is 99% the same. the 770 and m50 are very very similar sounding headphones. i'll try to break down the key differences. bass - I'd give the nod to the m50x. the bass impact is greater on the 770, but the quality of the bass is superior by a very very small margin on the m50. mainly the level of detail is greater on the m50. it's not a huge difference though. I find the 770 bass to be just a bit too hard hitting. it's excited, but fatiguing. both headphones with an amp control bass fairly well for their price. they both can get muddy sounding at times though. mids - 770 clear winner here in my opinion. though both headphones have recessed mids, the 770's are less recessed, in my opinion. again the m50 is more detailed, but I find the 770 mids more balanced, albeit grainy sounding. neither headphone do mids well though. highs - m50 clear winner here. the highs on the 770 can get very harsh, less so on the m50. again, m50 seems to have a super slight lead in the detail level. it's highs are a tad smoother and more refined. the highs on the 770 are it's weakest area, in my opinion. overall impressions - though the m50 has better technical abilities when broken down, I just have more fun listening to the 770. but the margin is super slim, please keep that in mind. they're both V shaped sound signatures with emphasized lows/highs, and scooped out mids. for my main genre, rock, I just get more engaged listening to the 770. I also get more fatigued as well due to it's heavy bass signature. despite many arguments to the contrary, I'm a big proponent of amping both these headphones. the main benefit is a tightening of the bass. both headphones exhibit tighter and more controlled bass under amp. they get less boomy/muddy as well. for me, that pays huge dividends in reduced fatigue. heavy and muddy bass fatigues me rather quickly, so anything that can tighten the bass of any headphone is a must. non-sound thoughts: the m50x version with it's detachable cables is a really nice feature. it's only moderately comfortable though. I don't hate my m50, but I don't love it either, from a comfort perspective. the pleather ear pads are horrible in comparison so the velour goodness of the 770. the 770 as a whole is just so much more comfortable to wear. it also isolates better as well. you'll hear less outside noise with the 770, and less of what your listening to will leak out for others to hear. both isolate good, but the 770 in my opinion is a clear winner here. both are well built and very durable. the m50 is more portable with it's detachable cables and folding design. the 770 is a more classy looking headphone, but also a bigger one as well. easy of use - m50 huge winner here. its only 32ohm and sounds good plugged into just about anything. you get great volume and very decent sound dynamics even unamped. the 770 on the other hand really needs an amp to sound it's best. if you don't amp your headphones, get the m50, it will sound better. as I've said, they're very similar headphones, you really cant go wrong either way. does this sound accurate to you? i think maybe the reviewer did not have the pro version of the dt770 because he implies that the dt770 does not have detachable cable. anyway, if you have used both, i would value your input.