I just noticed that on my Xbox, with Dolby Access up to date (version 3.1.3760.70 for me), upmixing is now an option in Dolby Atmos for home theater. I have a 5.0 speaker system with a Dolby Atmos-capable AVR--I don't have overhead speakers, back speakers, nor a subwoofer--and I've only tested one app--myTube--with upmixing on vs. off (I'm interested to find out whether content with less than 5.0 channels will be upmixed to come out of the center and side-surround speakers) and I've only tested one video in myTube with on vs. off. My Tube is a third-party YouTube client and since YouTube only supports 2.0 audio, YouTube is a good way to test upmixing on Xbox One. With upmixing on, some echo/reverb sound very faintly comes out of the center speaker but it seems like the front soundstage is mostly left alone. I haven't yet tested my side-surround speakers with upmixing on vs. off.
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EDIT: Here's how I access the "channel upmixer" toggle switch. I've already set up the Dolby Access app, and if you haven't, you might have to do that first. Regardless, here's how I get to that toggle switch:
1. Open Dolby Access
2. At the top of the screen, switch to the "products" tab.
3. On that screen, there are three boxes--one that represents Dolby Atmos for Headphones, one that represents Dolby Atmos for home theater, and one that represents Dolby Vision. Select the one that represents Dolby Atmos for home theater.
4. You'll see a toggle switch called "channel upmixer". Below the switch, a description is provided. That description reads: "provides a surround with height experience while listening to multi-channel audio sources".
TV: LG 47LW5700, AVR: Onkyo TX-NR787, speakers: DCM KX speakers:
DCM KX-12 Series 2 (as front left and front right), DCM KX Center Series 2, DCM KX-6 Series 2 (as side surround left and right), sources: Xbox One S, Playstation 2 (fat model), Nintendo GameCube (model with digital AV output) with GameBoy Player, Panasonic VCR (PV-4661), PC: Microsoft Surface Pro (5th generation), phone: iPhone 7 Plus
Last edited by Drew Neilson; 11-26-2019 at 06:19 PM.