Use case… Streaming or Download 
or not 

OK, I’ve got a first world problem. Tweaking the car audio. Putting in a better (but still original size puny 6x9) “subwoofer” in the original spot using the original leads has definitely helped the low bass.
BACKGROUND:
2024 Cadillac LYRIQ EV. I’m not going to go crazy, not going to change amplfication, or make other mods. Software is limited. This year - the last year that GM supports it - I can use Apple Carplay (and Android Auto if I feel like it) to connect from my phone to the car stereo system. The GM systems run AAOS (Android Automotive Operating System) which is related to but is not Android Auto. Starting next year, software has to be supported on AAOS, you won’t be able to use Carplay or Android Auto. I’m guessing it’s a security hole.
QOBUZ just came out with an AAOS player and I’ve installed it (along with Radio Paradise. I don’t use Spotify, but that’s available too).
The stock car audio DOES NOT have Parametric EQ. It has surround sound - adjustable, and Treble, Mid, Bass tone controls.
It’s not awful.
I have been running ROON ARC over Apple Airplay, connecting to the Roon Server I run at home. This gets me parametric EQ for anything playing through ROON. ROON ARC is slightly flaky. Well, moderately flakey. Many times it gets fussy with the connection. It seems to kinda-sorta want to step down resolution over a so-so connection.
I’ve been looking at downloading music to my phone, which lets me use ROON ARC as a player without concern for the vagarie of the Airwaves (State of the Ether, or just plain luck). I find that I can access Apple Music downloads if I download to my Mac, which also runs the ROON server. And then I point the Roon Server at the Apple Music Media folder, which lets me use ROON ARC to download said high-res files to my phone. And play them in the car.
I see stuff in my QOBUZ library, but it’s of course not downloadid. And QOBUZ plays nicer with ROON than my Apple Music Kludge.
So is it worth subscribing to the SUBLIME tier on QOBUZ and paying for some choice high-res download files? ROON is aware of the AAOS situation for several makes this year and ALL GM next year, they may release an AAOS version of ROON ARC.
In any case, I find I like my car well enough that I might choose to upgrade it in a year or so to the new model a LYRIQ V which would have adjustable suspension and another 150-200 horsies and pounds-feet to play with. But no Carplay…
And for those of you who are into downloaded files, how is it working wiht them. I haven’t played that much with actual files since ripping a bunch of CDs years ago.