I just pulled out my DT880-600's when I got my new DAC (Audiolab M-DAC).
It has some filters that aid in what I've found to be the 880's primary issue (for my ears...), being over-bright.
The filter that incorporates the greatest roll-off of the highs provides the greatest relief for me, and makes the 880's much more enjoyable.
My previous combination had poor synergy (w/ the Benchmark DAC1-PRE).
Edited by shane55 - 3/12/13 at 10:00pm