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 then got an optical cable from the TV to the Soundbar.
This works but I have to have my TV on to play music from my local iTunes music storage (more music than I own online as many were bought on CD).
I have tried connecting the AVR "Monitor2" port to the soundbar via HDMI and fooling with various ARC and HDMI control settings on the AVR with no luck in that I don't get sound to the soundbar. I have also tried running an optical cable from the AVR's optical audio out to the soundbar with no luck rather than running it from the TV's optical audio out to the soundbar.
I was able to get my desired configuration working when using the wires out to speakers rather than the soundbar.
I'm a nerd of sorts but... not this kind of nerd it seems. I've tried a few other permutations and am blocked. I guess I lack an understanding of if my AVR can send out to both it's HDMI outs at the same time or if it can send out video to the Monitor1 port and audio through the optical out port at the same time.
This works but I have to have my TV on to play music from my local iTunes music storage (more music than I own online as many were bought on CD).
I have tried connecting the AVR "Monitor2" port to the soundbar via HDMI and fooling with various ARC and HDMI control settings on the AVR with no luck in that I don't get sound to the soundbar. I have also tried running an optical cable from the AVR's optical audio out to the soundbar with no luck rather than running it from the TV's optical audio out to the soundbar.
I was able to get my desired configuration working when using the wires out to speakers rather than the soundbar.
I'm a nerd of sorts but... not this kind of nerd it seems. I've tried a few other permutations and am blocked. I guess I lack an understanding of if my AVR can send out to both it's HDMI outs at the same time or if it can send out video to the Monitor1 port and audio through the optical out port at the same time.