I am using latest Spotify app (220.127.116.113) on OnePlus 3T with OxygenOS 4.1.6. My device is not rooted or unlocked but it's a general problem, when I'm listening to music on Spotify the overall volume is lower when compared to other sources even when maxed out (when compared to local files on PowerAmp/YouTube/TIDAL with the same song). I don't get it, even with the same masters I can definitely hear a volume difference. Anyone ever noticed it? How can I solve it?