I discovered Mu-so QB sounds better when using built-in Spotify Connect ability than playing Spotify through Airplay.
I use an older iPad to create Airplay connection to QB. Sound is muffled. Easy to listen, but sound detail is not there. Also bass level is increased versus treble.
When i let QB run Spotify Connect through LAN sound detail is increased and and treble frequenses are more leveled with bass. Overall sound is considerably better to my ears.
I am interested to hear your thoughts regarding Spotify Connect's sound in different setups.