With this set of equipment (Onkyo AVR S920W, Bose 700, LG OLED55B8PUA, Apple TV 4k), I have all the output devices (AppleTV, XBox) feeding into the AVR via HDMI cables. From the AVR I have an HDMI cable from the ARC "Monitor1" port to the TV's "HDMI 2" port that claims to be ARC as well. I've...