Apologies as I am sure this has been answered already in the 45 pages of this thread but:
I am buying an Atmos capable receiver this week however I only have a 5.1 speaker setup. Will the Tidal Atmos music play via my Apple TV 4K and be downsampled to 5.1 ?
Thanks
I configured my Atmos AVR (Marantz/Denon) to a quad speaker setup (no center, subwoofer, and height channels).
I restarted the Apple 4K TV -- this is when the Apple will try to detect if the AVR is Atmos-capable.
In this case, the Apple 4K TV detected that the receiver is Atmos capable, even if the speaker configuration is quad .
The Apple doesn't know / doesn't care about the speaker configuration -- it only knows that the AVR is Atmos capable.
You can tell if the Apple 4K TV detected an Atmos receiver if there's an option in the Audio settings in the Apple to enable / disable Atmos.
When I play an Atmos track on Tidal, the AVR receives an Atmos signal and 'renders' the Atmos signal to the current speaker configuration (quad) -- see below:
With the Apple 4K TV, there's an option to disable Atmos, and set the format to Dolby Digital 5.1.
In this case, the Apple 4k TV sends a Dolby Digital 5.1, and the AVR 'renders' the 5.1 signal to the current speaker configuration (quad).
The Tidal app will display a message "Playing in stereo", but it actually sends a discrete 5.1 signal.
In both cases, the audio from the height channels are downmixed to the 'floor' quad speakers.