Does it make me wonder if I've got some setting wrong?
I can tell this thread is liable to get tangled pretty soon, so if it's easier to PM,
@zeerround , feel free.
But even before the latest back-and-forth between you and
@GOS , I was wondering how easily I'd be able to do the comparative listening you're looking for feedback on--only because of the vagaries of how my Windows 10 laptop connects to my AVR (a Marantz 1607) via HDMI. (The Marantz 1607 will only do Atmos 5.1.2, by the way--and that's what I've got.)
So in the Windows sound settings, my default "device" is "marantz-AVR | AMD High Definition Audio Device." The thing is, the settings for that device driver also seem to require that I select a specific default "Speaker Setup"--Stereo, 5.1, 7.1, or Dolby Atmos for Home Theater (or Windows Sonic for Headphones)--by right-clicking the speaker icon in the system tray. I've checked 5.1; the corresponding listening mode displayed on the front panel of the AVR is "MultiChannel In."
Here's the problem with that: it plays 5.1 source material (whether from foobar2000, VLC, or SPECWeb) just fine, of course. But if I feed it a stereo source (without changing the speaker setup to "stereo"), it effectively fails to apply DSP settings in the AVR. That is: "MultiChannel In" directs a stereo signal only to the fronts, while "MCh In + DD" (the Dolby Atmos upmixer) plays in only fronts and heights. Nothing in the rears, center, or sub. (The "MultiChannel Stereo" DSP, for some reason, spreads the signal around all 7 speakers, as it's meant to.)
So if I'm gonna use @zeeround 's files to do an A-B comparison between upmixers, I won't be able to quickly switch back and forth between listening modes using my AVR remote. Not impossible, just kind of a pain. If anybody knows how to tweak the Windows Sound settings for this device driver so that it will detect the audio source type on the fly, automatically, let me know!