Another thing you can do besides a rug on the floor is put some damping material on the ceiling. You can paint/color it the same as the ceiling is already to make it blend, but this is something that isn't so noticable as other room treatments that might tame the highs just a bit that is also usually fairly WAF friendly.

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD