Spotify connect and synchronized playslist

[microgolgi]

Hi,


I synchronized several playlist in local on my PC/Nexus10/Lumia 950XL.

I would like to play these playlists on my Denon AVR-X2200W but as I understoood, I need to have a network access to be able. 

So as my playlist are on my synchronized with my devices, why I need to have a network access?
Is it a way to avoid this connection to Spotify Server ? 

Thanks for your help