[seamon]

Ok. I love my JVC FX850 but there's something that I have noticed. Sometimes when in a song there's shhh sound, it kind of comes as harsh. For example : 
https://www.youtube.com/watch?v=1G4isv_Fylg
at 45s, when he says " she respected the world", the 'sp' of respected comes out as extremely harsh and kind of drags. Is this sibilance? 
This does not happen when I am using my DT 770 Pro 32ohm. Any IEMs that are like JVX FX 850 minus this problem?

 

[Kammex]

Is it only with s and t sounds? Also, try equalizing down 6 kHz, or 4 kHz and 8 kHz (depending on the increments for your device) and see if that fixes the problem.