My ATV 4K works fine with two Bellini HDMI 48GBps cable (one from the ATV to the sound bar, the other from the sound at to the tv). When I start the A
TV, everything powers on, the tv displays the ATV, then everything goes black for a few seconds. The bar shows TV ARC, and after 5-6 seconds switches back to HDMI 1 and works fine after that.
So find, that I can’t use HDMI2 where my Xbox one x is plugged in ! The bar keep switching to hdmi 1 by itself. I think it is due to CEC, the ATV “asks” the bar to be displayed. For the moment I unplug my ATV’s HDMI cable when I want to use the Xbox. I’m worried that adding an extra layer with a switch will bring even more problem with the signal transmission, as we’ve seen many with this bar. As well as adding again one more remote.
Btw, my ATV 4K is set on SDR 60hz and adapt to the content (switches to hdr when the content is in hdr). Of this helps other users...
Sorry if I’m hard to understand, English isn’t my first language.