Low sound quality, or noise or unusual sound can be heard.

  • If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities, noise canceling effects, or call performance.
    If any of this is the case, try the following.
    • Change the earbud tips to ones that fit more snugly in your ears. When changing the earbud tips, try the earbud tip sizes in order from the larger ones to the smaller ones. The most suitable size of the earbud tips for left and right ears may be different.
    • Check that you are wearing the headset properly in your ears. Wear the headset so that the earbud tip is comfortably situated as deep in the ear canal as possible.
  • If you press the button on the left or right unit when the headset is not connected via a Bluetooth connection, you will hear a notification sound indicating that the headset is turned on.
  • Turn down the volume of the playback device if it is too loud.
  • Switch the Bluetooth connection to A2DP with the connected device when the headset and the transmitting Bluetooth device are connected via an HFP or HSP Bluetooth connection.
  • If the headset connects to the previously connected Bluetooth device, the headset may only establish the HFP/HSP Bluetooth connection when it is turned on. Use the connected device to connect via an A2DP Bluetooth connection.
  • When listening to music from a computer on the headset, the sound quality may be poor (difficult to hear the singer’s voice, etc.) for the first few seconds. This is due to the computer specifications (priority on stable connection at the start of transmission and then switches to priority on sound quality several seconds later) and is not a headset malfunction.
    If the sound quality does not improve after a few seconds, use the computer to establish an A2DP connection. As for the operations on your computer, refer to the operating instructions supplied with the computer.
  • Some devices that emit ultrasonic sound waves designed to repel rodents may occasionally be installed at the entrances of commercial facilities or subway stations. Near such devices, the ultrasonic sound waves may cause noise or unusual sound to be heard from the headset. Leave the place where the noise or unusual sound is heard, or turn off the noise canceling function/Ambient Sound Mode from the “Sony | Headphones Connect” app.