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garegin113 Author

Level 1

4 points

Apple TV 3 Gen. Connecting to Sennheiser Ambeo Max soundbar.

It starts with 4K HDR and Atmos available in ATV settings , but then it drops to 1080 HDR. Can’t understand if problem in ATV or soundbar… I used different high speed hdmi cables, but it starts with 4K and then drops to 1080, not even showing 4K as an option.

Apple TV 4K, tvOS 16

Posted on Aug 24, 2023 4:41 AM

Top-ranking reply

Urquhart1244

Community+ 2024

Level 10

143,058 points

Posted on Aug 25, 2023 2:56 AM

Verify that your HDMI cables are rated 18 Gbps or better (48 Gbps recommended for when both ends connect to a HDMI 2.1 port).
Verify that your Apple TV is set to 4:2:0 or 4:2:2 chroma, as 4:4:4 can exceed the bandwidth limit for 18 Gbps connections when streaming 4K+HDR+60Hz. This chroma setting will not diminish the video quality, as all streaming video is encoded 4:2:0 anyway.
Verify that the TV is set to allow high bandwidth streams over the chosen HDMI port (Enhanced, Deep Color, etc.). How it is named may vary by brand.

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Apple TV 3 Gen. Connecting to Sennheiser Ambeo Max soundbar.

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