I ended up buying the Onkyo SBT-A500 off Amazon..
I'll let you know how it works out!
Microsoft Xbox One S (1 gig BF1 model if it matters)
DirecTV HR44 Genie
I have the TV outputting from HDMI4 (ARC) to the Onkyo input (also ARC).
The DirecTV genie is plugged into the Xbox One S (HDMI input).
The Xbox One S is plugged into the "Game" input on the Onkyo (HDMI #4
I think by default, they're all 2.2 capable though).
It's a pretty simple setup. I have a set of Turtle Beach headphones I need to connect optically, but haven't worried about that yet.
At first I had some issues getting my TV app audio to play, then finally realized HDMI ARC wasn't turn on.. oops. Got that sorted out, but I'm not sure if it's outputting Dolby Digital/etc. Need to do some more testing with this.. but I moved on to the Xbox.
Popped in my Oblivion UHD disk and the picture came up and sounded fine, but no Atmos (TrueHD or something). I had to figure out how to enable it on the XB1S (Blue Ray settings, I'm in preview). Got that enabled and restarted everything and it is now successfully outputting an Dolby Atmos signal. It's playing in 4K with HDR and Atmos. Sweeeeeeeeeeeeeeet!
I had a few black screens, and the signal to the TV seemed to disappear, requiring me to turn off the Onkyo and turn it back on to get the signal restored.
After that I figured I'd check for new firmware.. and.. a new version came out yesterday! Took about 10 minutes to download and install (75M/75M FiOS).
Since the update I haven't had any more black screens or dropouts. FYI I'm using all "high speed" cables that came with the Xbox One's I've gotten over the years. I ordered some certified platinum or whatever HDMI cables from monoprice, will use those once they arrive. ARC seems to work fine with the TV now, volume up/down, tv on/off.. etc.
The Atmos is really cool.. I think I probably need to calibrate it some more (and need a tripod..), but it seems like a cool feature.
One issue I've seen is while jumping around chapters/FF in Oblivion UHD the sound got kind of wonky. I'm not sure if this is the Xbox's fault, since the atmos support is beta or what.. but typically pausing and resuming fixes it.
Gonna try some Xbox tonight and watch a couple movies tomorrow.. we'll see how it goes.