I just produced an album release on Type I cassette. High quality Type I (ferro oxid) is almost comparable to Type II, but you need the correct bias settings while recording. Practically the 8bits/50db is non-sense. Really. Maybe on a very bad tape deck you have a signal-noise-ratio of 8bit from silence to the first noticeable noise? But the actual music you are playing has much more dynamic range possibilities. Tbh my recordings on tape sound more dynamic then on Spotify.