[MajesticTwelve]

There are first reviews of the upcoming Sony Xperia XZ2. GSMArena.com included audio impressions in their test:

Very good audio quality
The Xperia XZ2 represents a big step forward for Sony when it comes to audio output. In previous years the Japanese company’s flagships have been a step behind their rivals, but this time around we were treated to a performance worthy of a flagship. When hooked to an active external amplifier the XZ2 delivered above-average loudness and perfect clarity as befits its standing.

Plugging in a pair of headphones dropped the loudness to only average, but the accuracy of the output didn’t get damaged. The hike in stereo crosstalk was well contained and while some intermodulation distortion did creep in, it’s nothing you will notice without dedicated testing equipment. All in all, the Xperia XZ2 delivered a solid performance with no major weak points whatsoever.

Sony Xperia XZ2 frequency response

source

 

[nort ycagel]

I'm curious about the audio quality of the compact version.
This is pretty interesting since those might be first smartphones to actually use the analog audio functionality of the type c port.