What should I do if the audio quality is poor, and crackling noise can be heard?
a) Check that your connected device is nearby, and there's no wireless interference or obstructions between the earbuds and your device.
b) Reconnect the earbuds.
c) Ensure your device supports both hands-free profile (HFP) and advanced audio distribution profile (A2DP) (Bluetooth stereo supported).
d) Some game apps with chatting function force the earbuds to enable HFP mode to support voice communication. The audio quality in HFP mode is poorer than that in the A2DP mode. To avoid this issue, quit or restart the game app.
e) Try to reset the earbuds.