“Is the ARC output an eARC output? Does it send lossless Dolby Atmos?”
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Dolby TrueHD is a lossless audio codec that supports up to eight audio channels on Blu-ray Discs. While Dolby Atmos and Dolby TrueHD are two separate soundtrack formats, Atmos data on Ultra HD Blu-ray is actually an extension to TrueHD that is folded into the bitstream to maintain backwards compatibility. Dolby Digital Plus is a lossy, lower-bandwidth format that has been optimized for use with streaming services and features like B-D Live. ... Dolby Atmos over Dolby Digital Plus will be the way most people experience Atmos. HDMI 2 on the LG 77” LG OLED TV B9 ThinQ AI, Model # OLED77B9PUA is an HDMI eARC port and if the Sound input is Dolby Digital Plus / Atmos, the output via the HDMI eRAC will be Dolby Digital Plus / Atmos. If the Sound Input is Dolby TrueHD, the sound output will also be Dolby Digital Plus / Atmos...^IFV
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