If your soundcore Liberty 5 is experiencing background noise in ANC mode, you can find a solution in this article.

1. It might be due to a poor fit. Follow these steps to ensure they fit properly:

- Check the L/R logos on the back of the earbuds to ensure you're wearing them on the correct sides. Rotate the earbuds to find the most comfortable position.

- Try different ear tip sizes to find the best fit and create a tight seal. If one earbud doesn't fit well, consider using different sizes for each ear, such as medium in one ear and large in the other.

2. Set the noise cancellation to level 4.

3. Try a different audio source or Bluetooth device, such as a phone or tablet, and see if the issue persists.

Note: Noise cancellation may seem less effective in loud environments.

If you encounter any other issues or your issue has not been resolved, please contact soundcore customer support for further assistance.