There isn’t a practical way. You could use an HDMI matrix like the one you found with one output going to the project and another to an ARC/eARC capable TV that can pass through Atmos, with Sonos Arc connected to it. Watch the video from the projector, and the TV just gets you the audio.
What is HDMI eARC? eARC stands for enhanced Audio Return Channel. It allows full-resolution sound signals, including Dolby Atmos, to be passed from your TV to the soundbar.
Jul 20, 2020 · Best Selling Blu-ray Players It is said to be the “perfect solution for a Sonos ARC/Bose 500/Bose 700 and any eARC or ARC AVR, soundbar or headphones.” The company calls Arcana “the smartest converter solution for interoperability between any HDMI sources and eARC or ARC sound systems.”
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You have to remember – eARC is still new and only really on some 2019 and 2020 TV’s, yet the Apple TV 4K and Atmos support on it came out in 2017, well before eARC was a thing – and plenty of people have been enjoying Atmos from their ATV 4K’s without eARC capable TV’s – myself included
Dec 08, 2020 · eARC stands for (Enhanced Audio Return Channel) and does the same thing as a regular ARC but with more features and bandwidth. Essentially, eARC is a faster and better version of ARC. The advantage to using eARC is for features such as; uncompressed audio on the following channels: 5.1, 7.1, and Dolby Atmos.
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This solution is designed to assist when the ARC/eARC feature is not working and both the TV and audio system are compatible with the feature. IMPORTANT: To use the ARC/eARC feature, both the TV and audio system need to support ARC/eARC.