Treble: a little bit piercing, especially on IPC. However, if connet this with the Hifiman player like HM-602, HM-603 or HM-801, the treble would be bright but not piercing.   Mid: clean and natural. Some might say it's lack of warmth, but with a warmth sound music player, the mid will be warm and full of emotion.   Bass: when I bought this, I thought this IEM lack of bass. After run for longer than 700 hours. It has much better perfomance on bass, especially the depth of the bass.   Soundstage: the only word to discribe the soundstage of...