I'm working on a script for a video comparing mostly the M100 and DT770LE, and may include the Momentum and ATH ESW11 or 9a in that too. The main complaints I've read about the M100 where the DT770 came out well ahead were things that (to my investigation) aren't fidelity features exactly. The cavernous sound of the un-EQ'd DT770 appears to be mainly a feature of the earcup design, and I recall the DT1350's substantially hollow sound as well - both sets I bought in 2011 and 2012. That cavernous sound, to whatever extent it's controlled or dampened by amps or other things, adds to the sense of space or soundstage. It's very pleasant when presented properly, but it does seem artificial to me, like a well-done simulated stereo or other mono enhancement. Check out the Rolling Stones' Satisfaction on the late CD's or downloads from HDTracks - a perfect implementation of mono enhancement without phony stereo effects. I never was greatly impressed by the Senn 800's soundstage for example. The M100's earcup fit is very snug and I get the idea (without opening it up) that they didn't plan to have extra space in those earcups for the sound to bounce around in, so it sounds very different compared to the DT770, like the extra space just disappeared. Listened to on its own, it sounds fine to me.
The other major feature of the DT770 that attracts its fans is the treble detail, and comparing to the M100, the M100 sounds somewhat dull or lacking in life, or sparkle etc. by comparison. But the DT770 has a very significant peak in the treble that (to my ears) makes a lot of music tracks sound like something is frying in a skillet in the background. There's a lot, a whole lot of excess high frequency energy being produced there. Using the -4 db correction at 7 khz (and -2 at 5 and 10k) I configured in Foobar, the DT770 sounds more normal, but even then the frying-pan sound is apparent in a lot of music, mostly pop and techno, albeit at lower levels. Playing the M100 on its own, the treble is OK, and in fact when you look at headphones like the Sennheiser Momentum, their upper treble is way recessed compared to the DT770.
The other major feature of the DT770 that attracts its fans is the treble detail, and comparing to the M100, the M100 sounds somewhat dull or lacking in life, or sparkle etc. by comparison. But the DT770 has a very significant peak in the treble that (to my ears) makes a lot of music tracks sound like something is frying in a skillet in the background. There's a lot, a whole lot of excess high frequency energy being produced there. Using the -4 db correction at 7 khz (and -2 at 5 and 10k) I configured in Foobar, the DT770 sounds more normal, but even then the frying-pan sound is apparent in a lot of music, mostly pop and techno, albeit at lower levels. Playing the M100 on its own, the treble is OK, and in fact when you look at headphones like the Sennheiser Momentum, their upper treble is way recessed compared to the DT770.
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