You can try the following troubleshooting:

1. Try different sizes of the ear tips that come with the earbuds and make sure you're wearing the earbuds in the correct position so that they create a tight seal. This will enhance the sound quality and noise cancellation effect.
2. Try different types of music and make sure the input audio source has no distortion or other noises.
3. Try different EQ modes on the Soundcore app and customize the EQ to your preference.