Audiophilepure

https://www.soundandvision.com/content/can-amazon-music-deliver-true-atmos-my-71-theater-setup

So, why are you hearing sounds coming from all of the speakers in your 7.1-channel system when playing tracks from the Roku Amazon Music app? The likely answer is that the Dolby Surround Upmixer processing in your Sony A/V receiver is engaged for the HDMI input to which your Roku Ultra is connected. The Upmixer takes incoming stereo (or 5.1 or 7.1) signals and intelligently steers them to the full array of speakers in a Dolby Atmos home theater setup to enhance spaciousness. The processing is part of the Dolby Atmos technology bundle that’s integrated in your AVR, which is the likely reason why you’re seeing “Atmos” on the receiver’s front-panel display.

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