@Win_88
Can we please knock this misapprehension on the head once again? 😢
https://en.wikipedia.org/wiki/Dolby_Atmos
Because of limited bandwidth and lack of processing power, Atmos in home theaters is not rendered the same way as in cinemas. A spatially-coded substream is added to Dolby TrueHD or Dolby Digital Plus or is present as metadata in Dolby MAT 2.0, LPCM like format. This substream is an efficient representation of the full, original object-based mix. This is not a matrix-encoded channel, but a spatially-encoded digital signal with panning metadata. Atmos in home theaters can support 24.1.10 channels, it also can do up to 118 dynamical simultaneous objects with 10 bed channels and uses the spatially-encoded object audio substream to mix the audio presentation to match the installed speaker configuration.
In order to reduce the bitrate, nearby objects and speakers are clustered together to form aggregate objects, which are then dynamically panned in the process that Dolby calls spatial coding. The sound of the original objects may be spread over multiple aggregate objects to maintain the power and position of the original objects. The spatial resolution (and hence the strength of the clustering) can be controlled by the filmmakers when they use the Dolby Atmos Production Suite tools. Dolby Digital Plus has also been updated with Atmos extensions
My emphasis on that last sentence.
But ARC can pass the (lossy) Atmos encoded in DD+ perfectly well; it’s only the lossless Atmos in Dolby TrueHD that needs eARC .
My favourite bedtime reading is a Sony product manual…
