Spotify streaming from pc

I need a little advice and or reassurance here.  I am streaming Spotify Family Plan Premium from my pc, via ethernet cable (due to distance), to my Oppo Sonica DAC which feeds my integrated amp and speakers in my listening room.  I have the Sonica app downloaded on an iPad, on which I can control what is being played, however, I have no audio quality adjustments available on the iPad/app.  It sounds okay, however, not nearly as good as Tidal and I am also not able to make any sound quality adjustments on the Spotify website at the pc either - as I could with Tidal.  Do I need the Spotify app on the main pc or not?  Is this just the way it is going to work or am I even doing this correctly?  This is the way I stream Tidal and it sounds great!!  Thanks for all help and advice!