How to Test Left and Right Speakers or Headphones Online

When music sounds wrong or a call is silent on one side, you need to know if the problem is the file, the setting or the hardware. A simple tone test finds out.

Quick answer

Press Left, Right or Both to play a tone in that channel. Change the frequency and the wave shape to check how your speakers handle low and high sounds.

Steps

1. Lower your volume first, because pure tones can be loud and tiring.
2. Press Left and check that sound comes from the left only.
3. Press Right and check the right side.
4. Press Both to hear a centred tone.
5. Move the frequency from low (100 Hz) to high (10,000 Hz).

What to listen for

• No sound on one side: wire, plug or channel setting issue.
• Crackling: damaged cable or loose connector.
• Distortion at high volume: small speakers hitting their limits.
• Missing low tones: speakers cannot reproduce bass.
• Reversed channels: left and right swapped in the setup.

Fixing problems

• Check the audio balance slider in the system settings.
• Try another cable, port or Bluetooth reconnection.
• Test in another browser or device.
• Clean the headphone jack gently.

Safety

Keep the volume low at first and take breaks. High pure tones can be unpleasant and may harm hearing at loud levels.

Everything is generated in your browser; no sound file is downloaded.