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This weekend's tweakery: install MoOde in the main system.If anyone is using Volumio on their RPi, I strongly suggest you try MoOde. Although it could just be my taste.
I also have Spotify but Volumio basically removed it from their plug ins. Prefer Tidal interface anyway and much better music selection for me.
Interested to hear your NAS files were slightly ahead in SQ.For me the Spotify sounded slightly more digital and Tidal slightly warmer and analogue'ish but only subtly so. I think with streaming becoming more mainstream and commercially driven operating systems may become more locked in to certain hardware/manufacturers and the DIY'ers may lose out.
Getting confused now as I found this thread setting up Tidal with MoOde http://moodeaudio.org/forum/showthread.php?tid=2199
On my main system, Spotify sounds worse than Tidal and Tidal worse than local FLACs. I don't see operating systems such as Windows or macOS excluding the Open Source Linux-based operating systems for the DIY community. Open Source is more and more important on the internet (servers) and in mobile (Android), so I don't see it going away.Even macOS is based on Free BSD, a variant of Unix, which is Open Source and in turn related to Linux.