[Krekmate]

Crinacle's graph actually says that, so that means we can ignore everything between 7k-10k on his site?

Technically the peak in that region is just exacerbated by the coupler. Due to IEMs being in your ear they will have a resonance of some kind which will boost some of the upper regions of the frequency response. Just varies more than being specific to ~8khz. Here's an interesting response about this very phenomenon from orratory1990:

https://www.reddit.com/r/oratory199...ow_iems_tend_to_exhibit_a_resonant_peak_at_8/

 

[PopZeus]

Its graph looks very similar to the ER2XR, I might check it if they have free returns.

The Elixir can be a bit fit-dependent in my experience but it's better than the Tanchjim O2.