In contrast, I find the ATH-M50 have heavy, thick lows with weak mids and modest treble. Not excessive bass, but thicker than, say, the AKG K240 which I find almost blandly neutral and honest with a flat, even response curve across the range, which is not a bad thing, but not musically exciting for listening long term. I much prefer the AT-M40 which is far more neutral and balanced top to bottom than the ATH-M50, and more musically exciting than the K240. I sold them because they have multiple ways to fold flat or reverse ear cups, making them floppy sloppy and awkward to handle. I do not like having to sort them out every time I put them on. (Yeah, I know that has no impact on audio quality, but one tends to avoid tools which are awkward to use, even if they do the job.)
Happily, I recently acquired the Austrian Audio Hi-X15 (which uses the same driver as its much more expensive siblings) and I am very pleased with both its sound, build and comfort. Not quite as neutral as the AKG k240, and rather close to the analytical, yet musical, ATH-M40 in sound - they a very comfortable and affordable at $110. Well balanced across the frequency curve with good articulation and detail without being brash, sibilant, or shrill as some other, especially open back, cans are.
And that is just MY take. Your mileage may differ. James K8JHR