Aimer’s voice is quite unique and husky.

I face the same problem with her voice being sibilant in some of my iems.

After experimenting with some EQ on different iems, I found peaks above 10khz are causing this issue with Aimer’s songs.

Do note that I only felt her voice to be sibilant in few of her songs.

Aimer’s “Midnight Sun” album is basically unlistenable in my IE 200s without EQ. Whereas her “daydream” album is just made perfect for it.

I love her songs too:)