ADV.Sound M4

Mentally adding level around 6 kHz to compensate for my measurement rig's calibration inaccuracy, we get a quite evenly rising treble that is definitely on the bright side.

So yeah, the in-ear is dedicated to treble lovers but does not sound edgy, overly obtrusive or unpleasant. I quite like it for its price to be honest, as it sets itself apart from the usually very bassy or v-shaped in-ears usually found in this price range.