Sharing some info on how to get Dolby Atmos tracks (on Amazon) on the DMP-A6
This thread about the Atmos vs Stereo mixes of Lady Gaga's new album (and the dynamic range vs loudness war stereo version) got me interested in trying out Atmos tracks to hear the difference in dynamic range.
I have Amazon Music Unlimited so I tried listening to the 2-channel downmix of the Atmos version and compare it to the native 2-channel. I also wanted to see if the mixes have different/better dynamic range on Atmos tracks. In this case I'd probably take the 2-channel downmix with better dynamics over a lossless loudness-maxed-out version.
On my Eversolo DMP-A6, at first I was only able to get the 2-channel tracks to play (using the Streaming / downloadable Amazon Music app on the device - "Amazon Music" icon).
Using the native app on the Eversolo ("Music" icon without the "Amazon" - preloaded on the device), which has a UI like the Windows desktop app display (and can show lyrics), it shows Atmos tags in song lists.
On "Perfect Celebrity" (Lady Gaga track), the "Music" native app volume is a lot lower in SPL at the same volume level, and seems to have more dynamic range. I switched from the "Music" icon app to "Amazon Music" icon app and the same song was a lot louder, more compressed dynamic range. I switched back to the Music app one more time to verify.
So it seems that on the Eversolo DMP-A6, using the native Amazon Music app (PC desktop app interface - can only access through front touch screen / Cast screen sync on mobile), Atmos tracks are available and the default version that plays on tracks that have Atmos and Stereo. However there doesn't seem to be a way to opt out of the Atmos version of the track, so you're stuck. Maybe this is something they can add to a future FW update.
On my iPhone in the Amazon Music app, I can swap between Stereo and Atmos versions while playing out the phone's speaker, and when connected to my Beats Fit Pro IEMs and dongle DAC/headphones.
From my iPhone I am able to connect with Airplay to the Eversolo DMP-A6 and see on the display readout that it turns into AAC 256k stereo files when sending both 2-channel hi-res and Atmos tracks. Same goes for connecting with Airplay to my Denon 3700h AVR, although it doesn't provide the same file spec readout.
Listening to the stereo and Atmos versions of Lady Gaga's Mayhem album on a few tracks, including Perfect Celebrity (seems to have a very wide difference in dynamic range between the versions), the volume seemed to be 7-10dB different on the dial to level-match the SPL of the main vocals (based on how far I had to turn the volume dial to get approx the same base volume level of the vocals). The Atmos version had a lot more dynamic range in all of the extra sounds.
I listened briefly and compared a few other songs on the "Best of Dolby Atmos" playlist. The "modern" songs I checked (eg Billie Eilish, Lady Gaga) seemed to have a lot more dynamic range in all of the instruments and sounds, downmixed to 2-ch.
However Fleetwood Mac's song Dreams (and The Chain) sounded very very different from the original, the mix sounded sounded worse in the Atmos downmix (at least that was my impression). Bass seemed to be very elevated on Dreams (deeper bloom and recessed sound on the main bass line from the beginning), a lot of the instruments and backup vocals seemed muted or recessed (around 1:15), and the overall tonal mix felt very different. Perhaps this was a gimmick for Atmos to separate elements to different speakers/locations in the mix that doesn't translate well back down into a 2ch downmix (or maybe there are supposed to be more layers/depth?). Or this is from the 2004 Super Deluxe remaster (testing both Spotify 2-channel and "Music" 2-channel versions versus Amazon Music Atmos version -- Spotify version in particular is very similar to the Amazon hi-res 2-channel version, but quieter in the sense that it's missing the low-level noise/air/presence eg in the last 45 seconds of the song - like film grain in a movie scrubbed or smooth? hard to explain except that it just sounds quiet like a dark room, or the super localizable high-hat at the beginning in the Spotify version versus more air and the high hat taking up more space in the Amazon hi-res - I guess that's the Spotify compression)
The downside was that the downmix and the hi-res sent via Airplay to the Eversolo and Denon were limited to 256K AAC, and also I noticed quite a few blips and clicks especially on the Atmos tracks. I assume these were from the on-the-fly downmixing of all the channels into stereo, plus sending over Airplay.
I'd have to do more listening on my headphones/earbuds to see if the clicks persist there. But the benefits of the expanded dynamic range would require a quiet room (I have open-back headphones) and/or the noise isolation / active cancellation from my Beats IEMs to take advantage of being able to hear the lower volume part of the dynamic range without it getting lost and wasted.
It seems to be hit or miss on the Atmos tracks having better dynamic range, maybe higher likelihood for the more modern material, and the older material maybe suffering from stereo > Atmos mix > stereo downmix.
I'll be giving some of the Atmos tracks and playlists some air time on the Eversolo. Something new and interesting to experiment with.