OOOOK - after testing this Amp for a week now I'll send it back. Why?
The EMI protection - especially in the EDGE / GSM band is just bad. Only workaround is flight-mode but then you cant do anything besides listening to this perfect sound of this little amp.
And there is a bug - at least on my Galaxy S23. Sometimes the sound just mutes when you play music via the Samsung or just any other music app.
The slider is still moving which means that the track is still playing. When I press the next track button sound is back - very weird (and seldom).
The FIIO software is outstanding as well as the sound of the KA5. So it's not easy to send it back
Btw. an iBasso DC06pro which I have now doesnt show both behaviours.