I didn't think the DT880 worked well at all from a portable. It sounded its best with a powerful tube-based amp. I haven't spent much time with the DT770, so I won't comment.
SR71-A actually drives the 880's very well within sane sound levels, albeit on the high gain setting. Portable amps with smaller huevos or going directly out of a portable source is a joke with these phones. You need something more to go to 11. Both the CI and Cosmic do the job with ease.
In the first place, the DT880 doesn't sound like the DT770, one is an closed back, the other is a closed/open hybrid. But the DT880 is certainly one of the hardest headphones out there to drive, so no, please get a proper desktop amp for the DT880.
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