Yep pretty much that the HD 650 is the complete opposite of the T90. The T90 are detail monsters, so your not hearing "brightness" you are hearing detail. Give them some time and see if you enjoy the sound, I really enjoy them, however like you sometimes the high's can have a bit too much "sparkle" for my tastes aswell.
The HE-500 is the perfect inbetween imo....if only they were comfortable :(
Edited by Flognuts - 12/2/13 at 7:44pm