I’m having significant lip sync / audio sync issues with the Optoma UHZ65UST (known as P1 Pro in the US) and Sonos Arc. I have my video source with DD+ going into the Optoma HDMI 2 port, and the Sonos Arc connected to the Optoma HDMI 1 port (ARC). The Optoma manual confirms that DD+ / ATMOS is supported on HDMI 1 port. My Sonos Arc is paired with 2 x Play 1 and 1 x Sub (gen 2?) over wifi.
Sometimes I’m able to get the audo back in sync by switching the Optoma back to its own desktop / settings view, then switching back to view HDMI 2. This re-triggers EDID negotiation for the projector. But this doesn’t work for all video sources, and often results in losing the DD+ and ending up with 5.1.
The Optoma does have a audio latency control, but even setting this at the maximum (-50ms) is not enough to get the audio in sync.
Any ideas or suggestions greatly appreciated. Right now I have two very expensive sets of equipment (the Optoma and the Sonos ARC + surrounds + sub) and they are next to useless.
Best answer by Corry P
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