Hello,
I need some help please to troubleshoot why I am only getting “Stereo 2.0” sound on my Sonos Amp, please.
Physically I have an old Panasonic TX-P50S30B plasma connected to the Sonos Amp over HDMI (via ARC). Connected to the Amp are two floorstanding speakers. Source material is fed in via Plex using a Google Chromecast Gen 3 again via HDMI into the Panasonic TV. This works well but I only get “Stereo 2.0” sound reported in the Sonos app, even when I try to play AC3 5.1 material from Plex.
So obviously _something_ in my supply chain is down mixing to stereo but I am not sure what.
- I’ve tried connecting older Sonos Play 1’s as surrounds to the Amp. These work but again “Stereo 2.0” only despite the actual 4.0 configuration.
- The Chromecast and my TV are set to “Auto” for audio.
- My TV definitely passes 5.1 audio via optical as I have used that before with an older amp, prior to the Sonos Amp.
- Thinking that perhaps my TV is only passing stereo via HDMI, I connected a Sonos Optical adaptor to the Panasonic into the Amp instead. But again, I only get Stereo 2.0.
I have zero controls for audio via Plex (via PC or the app), so I assume it is pushing AC3 5.1 when possible. But it’s easy to go around in circles here (Plex support blame Chromecast/Sonos and vice versa etc.)
The Sonos Amp itself _does_ virtualise Stereo 2.0 into 4.0 in my configuration (at least it sounds reasonably good) but it’s not doing proper surround effects if I use a test track.
Any clues how to troubleshoot this next or what I am missing here?
Many thanks in advance!