[joepadmiraal]

There's a setting i use to solve this, it's the 'Prefer default audio stream' option.
I think i had to uncheck it to get the right audio stream.

In Krypton, for some reason it's tucked away in the Language settings.

 I am using Ziggo with tvheadend and the 5.1 channels are played as stereo for some reason and they sound horrible.
After unchecking the 'Prefer default audio stream' the 2.0 channels are used by default.
Thanks for the tip!

Update 2017-11-29:
Unfortunately the 'Prefer default audio stream' does not seem to work after all.
I have played a bit with the audio settings and did a reboot.
It now still picks the 5.1 channels but they sound correct now.
Now I will have to wait and see how long it will last