The solution is as follows:
1, the problem of the audio itself, change the headset or change a music to play to see whether it is because the audio itself is mono.
2, you can close the connection between the mobile phone and the headset, and at the same time delete the Bluetooth headset in the mobile phone Bluetooth list. After the Bluetooth match of the two headphones is successful, press the two headphones on both sides until the two headphones emit a connection prompt tone.
3. You can also press and hold the two earphones for 5 seconds to power them off, release them after powering them off, and press and hold them for 15 to 20 seconds to release them to clear the configuration information. After clearing the configuration information, you will hear a prompt tone. First turn on the right earphone and then turn on the left earphone, re-enter the Bluetooth setting, should be able to connect.
4, if the above methods can not be solved, it is likely that the headset is damaged, it is recommended to after-sales maintenance.
Turn off virtual surround sound. The left and right channels of Redmi 9 are silent when using wired wireless headphones, and the virtual surround sound needs to be turned off.
1 Open Redmi phone Settings 2 Find sound options 3 Pull down to find sound quality sound effects 4 Turn off virtual surround sound