haha it doesn't make much sense since all the Asense T series include damper less the t180, I talked to audiosense about this problem, they told me that Asian listeners preferred the sound of t180 without damper and that's why they didn't include (I hope it's for that).
then I told them that t180 should use damper or if not many users would be upset by the sound, in a few minutes he said that they would include damper in the next t180 and a new cable and that would fix the problem of 3k peak, and for the inconvenience they gave me A new t180 with damper and cable. I suggest talking to audiosense and asking for a damper , I'm sure they won't have problems sending them
Wow, this is some premium service right there