Va radau info:

Spotify uses 3 quality ratings for streaming, all in the Ogg Vorbis format.
  • ~96 kbps
    • Normal quality on mobile.
  • ~160 kbps
    • Desktop and web player standard quality.
    • High quality on mobile.
  • ~320 kbps (only available to Premium subscribers)
    • Desktop high quality.
    • Extreme quality on mobile.