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It's a mystery to me. I called the Geek Squad.G
I believe eARC is designed to provide the signal to control the amplifier. So- if you have eARC enabled, it is going to automatically set the input. Part of the design spec is so that there needs be only one remote (or so I've read). Can you change the input on the amp after you turn the TV/amp on?
https://www.digitaltrends.com/home-theater/hdmi-arc-explained-works-care/
So...when the TV is on the eARC prevents selection of inputs on your AV system?
Did the Geek Squad answer?
Yepper! One hour and a couple hundred dollars later I was good to go. Cable & CD/DVD player run thru the AV receiver. I can watch the TV - audio thru the receiver or watch TV & listen to CD's or turn the TV off and listen to CD's or one of the Stingray commercial free music stations.
I could do all that before I wrote the question (I don't know about stingray but I have lots of internet and streaming stations on my TV, phone and AVR). I can also bluetooth music from my phone, cast video to my TV and AVR from my computer, play different audio in my house vs my patio, and remote control my AVR from my phone app. I installed all that myself and didn't pay anyone <Guzzi content> The video and audio is marvelous. But that wasn't what I was asking. And I'm learning so far is what I'm asking can't be done with eARC without going through too many menus with my TV.
Just curious, can you use your TV’s menus to go to the eARC HDMI input and have an option to switch to ARC instead of eARC? If you can, that setting would probably prevent your TV from locking out control of your AV system.
What a co-winky dinky I just got a new DENON AVR-S54BT amp too I saw no mention of aARC however. The amp has Blue tube capabilities so we've been diggin' on youtube music videos and Pandora through the Ipad, also picked up a Yamaha sub that with the Klipch Heresy speaks and I'm rockin' the hizz'ouse Good news! it's cut my screen time down to just about NIL!! cheers!
Try the Dr John channel on Pandora.
I will!