There seems to be some weirdness in Yamaha’s CEC implementation. I’ve been playing around with it and re-reading manual as I’m using a Sharc. I have an older Yamaha AVR 679. As soon as I switch HDMI Control on (even with ARC off, as I’m not using the AVR ARC input now and its not wired to C9’s ARC port) the AVR always thinks its receiving an TV input signal (i.e. ARC) and duly switches the speaker sound to AV1 input (or whichever AV audio input you’ve configure). I can’t see why its doing this and my AVR won’t let you specify the HDMI inputs as the “sound source” from TV - my Sharc feeds into AVR HDMI1.The audio return channel (ARC) is used so you can play audio FROM your TV through your AVR. Your Yamaha is being automatically switched to AUDIO 1, because that is how it receives the audio FROM your TV (the TV's internal OTA tuner, internal apps, and any devices connected directly to the TV) over the ARC HDMI cable. For any devices that are connected directly to your Yamaha AVR, you must select the appropriate input (such as AV2 for your cable box). If the cable box were connected to the TV instead, then you could use the ARC over HDMI OUT 1/ARC/AUDIO 1.
Because ARC is inseparable from CEC (Consumer Electronic Control) I don't know of any way to have ARC active without CEC turning the AVR on and triggering the AVR's ARC input with the TV. I just turn the TV on, and then after it's done turning the AVR on and switching to the ARC input, I switch to whatever input I want to use. The C9 is of course insistent on switching my AVR back to the ARC input anytime I switch inputs or apps on it.
Not sure that helps! Probably best in the eARC thread though...
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