Audiophilepure

https://headfonics.com/2019/12/inear-promission-x-first-contact/

The ProMission X has a degree more coloration than the ProPhile 8 but it is not as warm or bottom-heavy as the SD5. My initial impression here is of an articulate, pacy but natural sound. I do detect a gentle u-shape with an extended low-end and a bit of mid-bass elevation, maybe just shy of 4-5dB over neutral.

The low-end is offset or balanced out with a 1-2k bump that teases out some very nice and dare I say it fairly pure sounding vocals performances. What is impressive is the upper treble of the ProMission X. There is a bump around 8k but it doesn’t produce a lean or tizzy overtone on the high-pitched instruments. Instead, there is just enough to tease out an excellent harmonic balance and a nice sense of instrumental clarity with some good headroom.