The thing is though you can't look at the fr charts of the two to compare their neutrality. The thd in the D2000's bass plus the slow decay time by the minimally damped cups means it has way more bass than just a fr graph would indicate. Lots of ringing in the upper mids and treble also gives it timbre issues too. The mids of the D2000 sound cold and tinny while the treble sounds grounded and lacks air. The tinny mids was a big reason why I favored the HE-400 over the D2000 actually. Also as a whole, HE-400 has more mids than D2000. Vocals, instruments are all more present within its entire sound compared to the D2000.
The big bass of the D2000 does play nice with some electronic and hip-hop for some people, but the HE-400's bass is easily EQ'd to those levels and impact.
Only real nice thing I can say about D2000 these days is that it has great aesthetics and great short-term fit and comfort.
Edited by TMRaven - 8/16/13 at 10:13am