The T50v2 sure do have poor treble response, when damped as you had them. If I am getting my history right, Steve was the last person to open these up before I got them, and his initial damping layer had about the wind resistance of cheap craft felt, so about the lowest of anything in my ortho arsenal. They probably started rolling off around 5khz in that form, had absolutely no sparkle, or anything besides pounding bass. I currently have much, much denser stuff (glasses cleaning microfibre, followed by Ludo's black moorbrook cashmere), and the addition of circumaural pads and removal of the stock pads, which act as a bass lense, really help bring the treble out. Heck, I have had them once or twice that I bet MPWI here wouldnt find them too lacking. Well, maybe a bit, but he is crazy.