Originally Posted by usc1995
I would check two different things to verify if you are in fact missing some audio from the rear surrounds. First, I would test by not using the AVRkey and plugging the ATV direct into your Emotiva and check the audio. You won’t get the 4K video during the test but you should be able to tell if the AVRkey is cutting off your rear surrounds for some reason. Second, I would test with material you know has active rear surround information. Do you have any action movies you know to have sound in the rears you could test? If you hear sound when not using the AVRkey and then don’t hear it when you do then you know the AVRkey is the problem. The rear surrounds typically receive the least amount of sound in a 7.1 mix so it’s possible there just isn’t much if any in the mix even if all the channels are working fine. Do some testing and if the AVRkey is the problem you will need to push HDFury to resolve it.
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Thanks for your suggestions and thoughts. HDFury suggested the same thing as you, but for some reason, last night, i couldn't get the Apple TV to work directly with the Emotiva...even though i set things to 1080p SDR 60hz, i got this pink screen showing up with a weird resolution of 1920x2160 33hz...very bizarre. thankfully, i found via web search a way to force the apple tv to cycle through different formats:
in the end, for whatever reason, it landed on 1080p 60hz SDR (which i had set manually) and i could see the apple and accept the setting.
anyway, what this test confirmed is that for whatever reason, Apple is sending a container with 7.1 channels, but it appears there is no information in the two rear channels. (that was the hypothesis of someone on the Emotiva forum)
EDIT: i actually found a movie in my collection that has 7.1 info in DD+ : Monsters, Inc. it shows all 7 channels active on the Emotiva, and i get sound out of all 7 channels. so i guess its rare, but available... surprised a new movie like Star is Born wouldn't have 7.1 info...
anyway, i guess its good to confirm that the Emotiva is doing its job properly. it would be nice though if Apple/iTunes would send a 5.1 container of audio data rather than 7.1 with 2 channels empty...