@HerrSchurz , @Czaaart
Unless you’ve actually have had to work on releasing software and maintaining it… you really don’t know all of the issues.
If Rose is using an older release of Android and Spotify releases ‘lossless’ which is for a different release of Android or their SDK doesn’t support an older of Android… then you have some issues that take time to resolve. (On both sides of the equation. Either Spotify backports their SDK, or Rose upgrades to a newer release of Android. And neither is going to be painless. Spotify has less of a reason to do the backport.
Thats going to slow things down.
Now you have a couple of options…
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Switch from Spotify to Tidal or Qobuz for lossless. Note that if you search YouTube, Golden Sound has released a video talking about Spotify’s lossless.
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Take a device that has spotify lossless and connect that to the Unit and use that as input.
e.g Your Macbook USB-C out to USB-A on the Rose. I’ve also tested the iBasso DX180 line out (coax) into coax on my RS520.
Now that would get you lossless. Note that w the macbook you can upsample your source when you output to the USB port.
I also have a McIntosh MB20 for BT connections and using that to go from BT to optical in.
This gives me BT 5.0 vs what comes w the RS520. (IIRC its BT 4.2)
So you have options.
Now if you want to get rid of your RS520… that’s your call. You could always go to Eversolo Play which will not sound as good, has less power but a better UI and UX.
Or you could go and spend more on Atoll or Lingdorf (There are others out there … note that the Lingdorf has room correction.)
Lots of options… if you are serious about not have spotify lossless.