Anaxilus, I am curious as to how the HD800 mod might compare to this EQ setting. This is working very well for me with the GS-X mk2 and HD800. No doubt the combination is too bright but this setting resolves all complaints. With the treble lowered, I find that the mids and bass sound smooth and right in the zone. Without EQ, the sound is unbalanced and everything sounds lean. Also my ears hurt. http://1drv.ms/1Aitkks
Not too shabby. You can look at the first page and see how the before/after CSDs look for comparison if that helps.
I'd like to add that even the 2.0 version of the mod effect the sound MUCH more than the measurements (FR or CSD) would indicate. Just as effective as EQ with less negative results. It's worth a shot if you're having problems with treble nasties.
now. I am struck by how few negative results there are from EQing. The soundstage still extends as before and clarity is only lessened by the loss of glare which to my mind is not a loss at all. If the mod does even better, that is exciting.