I cannot figure this out. I have a Dolby Atmos system consisting of two front speakers, center channel, double subwoofers, two rear surround speakers and two front Atmos speakers. My Xfinity Audio is set to expert mode. I should be able to get Atmos enabled content from Netflix. I can’t. When I open Netflix, the Atmos logo isn’t displayed on content I know is available with Dolby Atmos. Everything just says 5.1. If I go to Netflix through my XBOX, there it is, the Atmos symbols. When playing any and all content on Xfinity that isn’t streamed, my rear surround speakers are silent. What signal is supposed to be going to my rear surround comes out my atmos speakers. I’ve checked and rechecked my wiring to my Marantz 9.1 capable amp. It is all correct. If I go to YouTube via the xfinity app and run a sound check video for either 5.1 or 7.1 sound, the rear surround speakers are silent. When the video says, “This is the right rear channel,” my right Atmos speaker fires. When I stream Netflix or Amazon, 5.1 content, the rear channels work. It is very frustrating.
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I’ve given up trying to get Atmos to work with a flex box. For me, the situation is even worse. I have a 7.1 surround system and it has apparently hopelessly confused Xfinity. The back surround speakers get no signal at all but my Atmos speakers do. Xfinity seems to think the front Atmos speakers are the back surround speakers. If I go to YouTube and play a sound check video for either 5.1 or 7.1, nothing plays in the back surround speakers. If I go to Xfinity/Netflix I don’t see any listings with Dolby Atmos. Netflix does that when their software thinks your system doesn’t have Dolby Atmos. My Xfinity audio settings are on Expert mode. If I start my xBox and go to Netflix, same listings but now they show Dolby Atmos and the surround sound speakers work just fine. Same if I do a sound test with my Marantz receiver. All speakers work. If I play a 4K bluray disk, Atmos works fine so there is absolutely nothing wrong with my wiring/configuration. It’s the Flex box. I can live without the Atmos working but it aggravates me to no end that my back surround speakers are silent. Whatever Xfinity thinks they have done right, per usual, they haven’t.
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