To keep Apple TV 4K’s interface true to SDR, it’s best to pick a video format that avoids unwanted HDR processing. For that, ...

If your devices only support up to 4K at 60Hz, a "premium high-speed" HDMI cable (18Gbps, HDMI 2.0) is perfectly fine. Again, just avoid really old or thin cables. Early HDMI cables (HDMI 1.4 or older ...