Hey all, my Arc was delivered this morning and I've had a chance to hook it up to my LG C9 directly via eARC and ran a few tests regarding Atmos and other features.
Built in apps:
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Netflix - Reporting Dolby Atmos (DD+) for Atmos content.
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Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU)
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Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.
Xbox One:
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HDMI Audio set to Bitstream out and Bistream Format set to Dolby Atmos has no delay, finally! Displays Dolby Atmos in Sonos app.
PS4:
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Like with the Xbox, there's no delay on Bitstream HDMI audio
NVidia Shield Pro:
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Netflix - Reporting Dolby Atmos (DD+) for Atmos content.
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Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.
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Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU). After connecting up to a US VPN it's reporting Dolby Atmos (DD+) for Atmos content.
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PLEX - This is where it gets slightly annoying. Playing TrueHD content it reports Stereo 2.0. Setting Passthrough to HDMI reports Dolby Atmos (TrueHD). For DTS content you need to switch the Passthrough setting to Optical which in turn causes TrueHD to playback in Dolby Digital Plus 5.1.
Apple TV:
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iTunes Content - Reports Dolby Atmos for Atmos content. Non Atmos content reports Stereo 2.0. With Change Format > On and New Format > Dolby Digital 5.1, I receive Dolby Digital 5.1 from non-Atmos iTunes content. I ran this test using Beetlejuice and Avengers Assemble.
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Netflix - Reports Dolby Atmos for Atmos content.
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Amazon Prime - Reports Dolby Atmos for Atmos content.
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Disney+ - Reporting Stereo 2.0 for all content bizarrely. Setting audio output on the Apple TV to Dolby 5.1 allows all content to playback in 5.1 rather than stereo.
My C9 is running firmware 04.80.03 with the following settings:
Sound Out
HDMI ARC selected
Digital Sound Out set to Passthrough
eARC set to ON
Additional Settings
DTV Audio Setting set to Auto
HDMI Input Audio Format set to Bitstream.
If there's anything else I can test or any questions, let me know!