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Most of what is stated in the above post is incorrect. I own the ATH-M50, while my officemate has the Beyerdynamic DT770 80ohm. We both have them on right now. I asked him to borrow them in order to compare them and I've switched back and forth for the past 15 minutes. Source music: FLAC files fed to an iBasso D2+ Boa DAC/Amp. Files I've tried are acoustic jazz, nu-jazz (St. Germain, Nicola Conte), Classic Rock (Allman Brothers Band), Blues (BB King - Live at the Regal).
Both are IMO amazing headphones. However their biggest difference is not the bass. With all the music I've tried, the M50 are FAR from being bass shy. They have a very precise and deep bass with a characteristic fast decay. I find the DT770 to have a slightly slower bass with a slightly slower decay. The bass on the DT770 seems to "envelope" more the listener, while on the M50 seems to have a more "uni-dimensional" nature. In both cases, the bass is rather balanced and does not ruin the other frequencies IMO. Overall I would say the spatial aspect of the reproduction is slightly better on the DT770, while PRat (pace, rhythm and timing) is better on the M50. Given the genres I listen to, I'd say I would be happy with both. Somebody listening to more classical/ambient etc should probably lean more towards the DT770.
Now, I don't know what a basshead is, and what a basshead listens to, but if you want ACCURATE and hard hitting bass for genres like jazz, blues, rock, classical, ambient, trip-hop, etc, the M50 have it. More bass than my M50 have, and I would totally hate them because the mids and treble would be ruined.
If you're looking for a tool to pump almost exclusively 40 hz tones in your ears without regard for the rest of the frequencies, then you shouldn't be looking at hi-fi/monitoring headphones at all - neither M50 nor DT770 will do what you want.