This is because Apple TV’s “Atmos” is its own special flavor of Dolby Atmos called “MAT.” Can’t remember what it stands for exactly but it’s a PCM-ready version of Atmos that the C4 matrix can’t downmix.
The only matrices I know of that can downmix Apple TV Atmos are the AVPro Edge models with updated MAT-downmixing cards.
C4 4K Matrix and Dolby Atmos Downmixing
in Control4 Hardware
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This is because Apple TV’s “Atmos” is its own special flavor of Dolby Atmos called “MAT.” Can’t remember what it stands for exactly but it’s a PCM-ready version of Atmos that the C4 matrix can’t downmix.
The only matrices I know of that can downmix Apple TV Atmos are the AVPro Edge models with updated MAT-downmixing cards.