Audio settings

[grahamh]

I suppose you have gone through this already

Audio hardware and software configuration

This wiki article should cover all your general questions about how to connect up your OSMC device to get the best audio possible. There’s also a section with explanations of some of Kodi’s audio settings as well as information about the audio capabilities of our OSMC devices. Supported devices OSMC supports a range of devices: All Raspberry Pis and our own Vero series (Vero 1, Vero 2, Vero 4K, Vero 4K + and Vero V). Veros have an HDMI port for video and audio, a 3.5mm port for analogue au…

Bottom line is you are doing it the hard way using ARC. The TV may only pass through 2 PCM channels to ARC or only Dolby Digital (AC-3) and I suspect will not transcode 5.1 PCM to AC-3.