For streaming services and Sonos Arc. Apple TV 4K uses a maximum of 4K60, so both Arcana models are suitable.
This streaming solution is often used for Netflix, Disney+, Apple TV+, Prime Video and other apps. Correct HDMI and audio settings prevent Dolby Atmos from being reduced to stereo or compressed audio.
Arcana extracts audio from the HDMI signal before a TV or projector can restrict it. A compatible soundbar or receiver can therefore receive the best available soundtrack while the video signal continues to the display.
Both models provide almost the same end result here. Arcana 2 is mainly useful when you require a second video output or HDMI audio output.
Cable order: Apple TV 4K → Arcana HDMI IN → HDMI OUT to TV/projector + eARC to soundbar
Use this route when 4K60 is sufficient and you need one video output.
Cable order: Apple TV 4K → Arcana 2 HDMI IN → TX0 to TV/projector + eARC to soundbar
Use TX1/HDMI audio when a second display or HDMI receiver is required.
Both models provide almost the same end result here. Arcana 2 is mainly useful when you require a second video output or HDMI audio output.
Only use EDID, scaling or lip-sync corrections afterwards when the standard route demonstrably does not work.
The settings above are the starting point. These are the things that most often go wrong on this specific device.
Match Dynamic Range and Match Frame Rate make the Apple TV switch output to suit the title instead of upscaling everything to one fixed mode. Each switch triggers a fresh HDMI handshake, which is why you see a brief black flash between titles. That flash is normal; if it turns into a permanent black screen, the handshake is failing and the cable or the display's port mode is the place to look.
Set Audio Format to Dolby Atmos rather than Stereo, and leave Change Format off unless you are debugging. The Apple TV sends Atmos inside Dolby Digital Plus, which any ARC or eARC chain can carry — so if your Sonos still reports plain Dolby Digital, the format was dropped downstream, not by the Apple TV.
Counterintuitive but correct: pick 4K SDR as the base format and let Match Dynamic Range switch to HDR per title. Forcing 4K HDR as the base makes tvOS convert SDR content to HDR, which looks washed out and gains you nothing.
Still not right? Work through the troubleshooting pages — no Atmos, eARC falling back, lip sync and a black screen at 4K120 are covered there step by step.
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