What's the meaning of "Atmos" as a supported codec separate from Atmos (TrueHD) and Atmos (DD+)?

  • 13 June 2022
  • 2 replies


At, “Dolby Atmos” is listed as something distinct from “Dolby Atmos (Dolby Digital Plus)” and “Dolby Atmos (TrueHD)”.

My understanding is that Dolby Atmos is metadata which is delivered via either DD+ or TrueHD, but not a format in and of itself.

I’d love any clarity here. Thank you.


Best answer by GuitarSuperstar 13 June 2022, 16:14

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Certain devices like the Xbox One X/S and Apple TV 4K use a Dolby MAT encoder, which is designed to encode, decode, and incorporate Dolby Atmos metadata into PCM audio. When playing Dolby Atmos content from these devices, the Sonos app will display “Dolby Atmos” as opposed to “Dolby Atmos (DD+)” or “Dolby Atmos (TrueHD)”.

Notice the note on the bottom of the page you posted: 

“Note that some devices, like Apple TV, pass Dolby Atmos and Dolby Multichannel PCM to Sonos using the Dolby MAT container. Dolby Atmos is Multichannel PCM that includes Atmos object data. Dolby Multichannel PCM does not include Atmos object data.”


I did see that but couldn’t parse it. Now I get it. Thanks for your very clear explanation!