The best system

Do not look among all systems of communication, UPnP, Bluetooth, airplay, ... this is the best, easiest, most open on all bookstores.
I used with Qobuz, amazon, spotify.
The desktop app and android / ios are very stable.
The DAC is very good.

I put one in the bedroom and in the living room (Marantz PM80 and BC acoustic Araks II - Class B amp Dared tube 100w and Klipsch RF 82 mkII).

I just took time to understand that if you have two sound systems, the latter must be in wifi and ethernet not, otherwise it does not.

This is perfection.