If you're experiencing low-frequency abnormal sounds, such as popping sounds, on your headphones, it can be frustrating and distracting. However, there are several steps you can take to troubleshoot and fix this issue.  

1. Turn down the volume;

2. Ensure that the leather case fits closely against the face to prevent headphone noise from leaking and causing abnormal sounds at low frequencies;

3. Try to reset the headphones, please refer to another article: How to Reset soundcore Q20i.