However: After pure HiFi criteria of Xiaomi Piston V2 is not an optimal listener. He sounds like erwöhnt already great, but is a fun handset. What does that mean - especially the bass is emphasized. The heights too, but only very slightly.
At the frequency response can well understand that: increase the bass, and it's falling again from the kick bass. Still, he is not too dull and not spongy. Slightly withdrawn mids, and easily stressed heights. Fall until around 14-16 kHz.
The handset is just pleasant to listen to. No annoying sharp heights, not a purely dull, slow and blurred Bassgewummer. Yet highly detailed mids and highs, this a definite graduation with a not too wide stage that it is but clearly present.
But compared with the Fidelio X1 he can not keep up, of course, though the difference is not too crass. Especially in stage and deep bass of Xiaomi is back, the bass is a little more stressed than the X1. For some people this can be tiring, I like it.
Now the only real downside: Not specified County / cable. Although wertig but extremely thin. In addition, already slightly bent when you arrive, not "broken", but somewhat annoying. In addition, the cable is very noisy (cable sound is at normal in-ears), but also more than I'm used to.
While the remote control is working directly on the Android, but since I will often run on a mobile KHV to KH, it is not important to me.
So overall recommended a strong buy recommendation, with the exception of absolute HiFiSpezialisten who need an absolutely flat frequency image and not for people who want to move with the headphones at a volume much quieter music (jogging etc.).