I am quite happy with the Apple TV 4K (2nd gen), except that for some reason I cannot get Infuse to play Dolby 5.1 in the recommended settings. I am following all advice on the support pages of Infuse and Apple. Sonos doesn’t provide meaningful support and LG is patchy.
Sonos Beam connected to LG C9 eArc (HDMI 2), running on Sonos S2.
Apple TV connected to LG C9 HDMI 1. Audio set to “Auto, Dolby Atmos available” or just “Auto” - same result.
LG C9: Sound out to “HDMI Arc”, Digital Sound out set to “Passthrough”, eArc set to “On”.
This set-up should assure that Apple automatically selects the right format and sends uncompressed multi-channel PCM (5.1 or 7.1).
However, only (!) when I play Dolby 5.1, Dolby Atmos from Netflix, Disney etc. there is actually 5.1 sound on my Sonos Beam. When I play from Infuse it becomes Stereo PCM 2.0.
I read a lot about Apple’s implementation of Dolby Atmos, why it only works with streaming. But I am in a different situation because my Sonos Beam would only accept 5.1 anyways, and Apples “automatic” setting is supposed to achieve this.
For now the solution is setting the Apple TV audio to “Dolby 5.1”, leave all other connections and setting equal. When I do this all sources work in Dolby 5.1 on my Sonos Beam. I would like to make the “Automatic” setting work, so that there is no conversion happening anywhere except the Sonos Beam.
I can leave it like this but seek help from readers who can explain to me what is going on. For some reason I have the impression that Apple TV HD (my prior Apple TV) worked swimmingly with the automatic setting, and the change happened with Apple TV 4K.
Thanks for reading and if you have guidance then please reply.