Sorry, sorry, I've only just realised you're all talking about me. That Belkin UPS hasn't been in my system for probably 3 years. My bad. I still have it, somewhere. I suspect my treble problem is exactly that, my problem. Since I applied the EQ all is well with the world although there's still a strident quality with the Q which, whilst good when you're in the mood, is damned annoying when I'm not.
I've decided to fix it by buying the HD650's. They should be here on Wednesday or Thursday. It's like the ultimate EQ, just buy different cans for different music & moods. Expensive way to go about it though.
Hope you enjoy them. I gave them a try, and while I enjoyed the different sound signature with some stuff (and less with other stuff), I couldn't deal with the pads. I must have funny ears. You can always sell them if they don't work out, or if your wife starts giving you the evil eye, or throwing frying pans at ya I got rid of mine pretty easily, though took a bit of a bath, as I was impatient to unload them and buy my Bifrost