I'm not sure how to justify this scientifically (and I'm a scientist, so that bothers me), but I consistently hear all balanced armature (BA) iems as treble dominant and shrill. I've tried a lot of them, including some of the "best" (Shure SE846, Ibasso IT03, Campfire Jupiter and Dorado). Thinking the problem was how I perceived BA bass, I put serious money into Campfire Dorados and Ibasso IT03. Wrong thinking--the problem is the treble being hot. I have dynamic driver iems from Shure, Ibasso, RHA and none of them are bright. But even the "darkest" BA iems sound like Alvin and the Chipmonks to me. The question is why. Is there something about sound pressure levels, attenuation, isolation... that causes BA treble to interact with my ears in such a dominant (overwhelming) fashion? Does this happen to anyone else? I understand how bass is affected by poor seals. But I don't know of an analog at the high frequency end that would make BA treble go nuts in my ears. Anybody have any thoughts?