Mopidy better quality than Spotify?

I’m baffled and surprised. I installed Mopidy Icecast and linked Spotify. I have the Mac desktop client for spotify set to highest quality. In Mopidy I set bitrate to 320 and playing through browser. I played the same song on both and there is quite the difference. Somehow Mopidy stomped on the Spotify desktop client, like the sound is wild crisp and juicy. With Spotify set to high quality, which I didn’t even realize was an option, it doesn’t seem to be all that different from default quality at 160kbps. How is this even possible?