Does an amp help against the "dark and muffled" sound? Is that what you mean?
I've been meaning to audition them, simply because I listen primarily (almost exclusively) to electronic music of some sorts, EDM, synthpop, etc. and in a way I like the brighter sound on the HD25 for just that. My Pro 900 are a little fuller, darker and warmer sounding (it could very well be my old integrated amp putting some warmth in there, supposedly they should be cold and analytic) and I find the D2000 a little more "neutral" (not as in 'neutral', but as in between bright and dark), so I kind of like the brightness of the HD25 as contrast. However, aren't we all searching for improvements? So, what makes the TMA-1 better than HD25 for electronic kind of music?