Low sound level

  • If the headset is not worn properly in your ears, you may not obtain proper sound quality or volume.
    Check that you are wearing the headset properly in your ears.
  • Turn up the volume of the connected device.
    If the function of the headset is changed to [Volume Control] with the “Sony | Headphones Connect” app, you can adjust the volume with the headset during music playback or while talking.
  • Connect the Bluetooth device to the headset once again.
  • The inside of the sound output parts and air holes on the headset are not completely watertight. If any water droplets are left inside the sound output parts or air holes on the headset, the sound level becomes low temporarily, but this is not a malfunction. See “When you have finished using the headset” and dry the headset as described before use.
  • Set the headset into the charging case and close the lid of the charging case.
    You may be able to resolve some issues by setting the headset into the charging case.
  • Reset the headset.
  • Initialize the headset, and pair the headset and the device again.


  • Depending on the connected device, the volume of the device and the headset may or may not be synced. If the volume on a device is not synced to the volume on the headset, it will not be possible to use the device to turn up the volume on the headset once the volume is turned down on the headset.
    In that case, turn up the volume of both the headset and the connected device.
    If the sound is still low even after adjusting the volume on the connected device, adjust the volume with the “Sony | Headphones Connect” app.
    However, when the headset is connected to the USB transceiver and you are playing music on the computer, the volume cannot be adjusted on the “Sony | Headphones Connect” app.