If you're experiencing poor call quality when using your soundcore K20i earbuds, there are several tips and tricks you can use to enhance the call quality and improve your overall listening experience. In this article, we'll be sharing effective strategies for fixing low and unclear voices on calls when you use the soundcore K20i earbuds. To fix this issue, please try the following steps:

1. If you are only using one earbud, ensure that the other earbud is in the charging case.

2. Ensure that you are wearing the earbuds in the correct position to create a tight seal. If the earbuds are not worn properly, you may not achieve the correct call performance.

3. Ensure that the audio output device selected is "soundcore K20i" on the connected device and turn up the volume on your device.

4. If you make a call through an app, try using your phone to make a call instead to see if the problem persists.

5. Try testing your earbuds with a different Bluetooth device in a different environment to see if there is any difference.