“If I connect this TV via eARC to my vizio soundbar I just bought (has ARC input) and I connect my UHD Atmos Blu ray player into TV hdmi port......will this passthrough Dolby Atmos sound from my bluray through my tv and to mysoundbar and play atmos sound?”
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Hello Jimboski10. 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. If you play a disc with an Atmos soundtrack, the Atmos extension data is decoded by an Atmos- compatible receiver or Soundbar. If your receiver/Soundbar isn’t Atmos compatible, the extension data is ignored and the soundtrack is decoded as regular Dolby TrueHD. The eARC port on the LG NanoCell 90 Series 4K 65 inch Class Smart UHD NanoCell TV w/ AI ThinQ® (64.5'' Diag), Model # 65SM9000PUA will pass through Dolby TrueHD or Dolby Digital Plus when the Digital Sound Out is set to Pass Through in the TV. Dolby Digital Plus is less compressed than Dolby TrueHD and requires less bandwidth. However, as mentioned above, you will only get Dolby TrueHD on your Soundbar since it does not support Dolby Atmos and because the new configuration requires that both the TV and your Soundbar must support HDMI 2.1 and eARC sends full-resolution audio signal via an HDMI cable. ARC doesn’t allow you to bitstream the full-fat high-quality codecs such as Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio or DTS:X soundtracks that you find on Blu-rays and 4K Blu-rays. It simply strips out the core 5.1 data stream. If you want this level of functionality, you’ll need HDMI eARC. The main benefit of eARC is a big boost in bandwidth and speed. This allows you to send higher-quality audio from your TV to a soundbar or AV receiver. As is the case with ARC, you’ll need two devices with compatible HDMI eARC sockets for the protocol to work. This means they need to meet the HDMI 2.1 standard...^IFV
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