No audio for some MKV

A few MKV video files in my library does not play audio on my OSMC. I have tried checking/unchecking downmix and some other tips I found here in the forum but to no avail. The media info is here and a log from an unsuccessful playback is here

The OSMC is updated. Any help/pointers are welcome.

Looks like it uses AC3 encoding.
What do your audio settings look like?

Briliant! Thank you for the clue. I found the option “AC3 compatible amplifier” being checked and mine isn’t. Problem solved - on all my silent movies. Thank you so much!