Hey @Jtbmth, thanks for reaching out to the Community!
If you're on a mobile device or tablet and you're on Premium, you can change the audio quality by going to Home in the Spotify app > Settings (gear icon) > Music Quality > Select your preferred settings. You can choose from the audio quality settings in the table in Music quality details below.
If that doesn't help, try a clean reinstall of the app following these steps. This should reset any music quality settings or equalizer settings you changed on the app.
Let me know how this goes!
Billy-JRock Star 23
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