LOL. You like headphones that measure well, at least with my measurements. The exception is the D5000. The immense bass and bass distortion of the D5000 tends to mask everything else that isn't so well.
(A clean floor considering it's a closed headphone)
And as you said, the TH900 does have notable frequency response irregularities. However I feel it has certain qualities (clarity, low non-linear distortion, articulation, fast decay, detail extraction) which allow me to overlook its non-flat response. I'm sure you agree.
The D5000 will not measure flat on my rig. Here is the D7000 (which from my subjective guess has about 5-6db less bass at 50Hz than the D5000)
Edited by purrin - 6/20/12 at 9:02am