Just collaborating and not sure if it is something new (not a specialist here). My setup: TV: 2020 Samsung QLED Q80t eARC to JBL "9.1" soundbar Streaming: AppleTV 4k connected to TV The bar can decode Dolby ATMOS MAT (lossless), and the Bar shows Dolby ATMOS MULTICHANNEL PCM. i believe that, for Dolby Atmos, the passthrough is (sort of) working LPCM. Unfortunately I experience random sound drops, probably due to bad eARC implementation (maybe necessary badwitch to reproduce Dolby ATMOS plus to large on 2.0 eARC HDMI 3 connected to the bar). i am sorry if anything I presumed is technically wrong, but I am just relating my experience.
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