What Is a Speaker Tester?
A speaker tester plays a distinct test tone through your left and right audio channels individually, letting you confirm both speakers are connected, working, and correctly assigned to their side - a common issue after plugging in new speakers or a docking station.
How to Use the Speaker Tester
- Make sure your speaker volume is at a comfortable level.
- Click "Left" and confirm sound comes only from your left speaker.
- Click "Right" and confirm sound comes only from your right speaker.
- Click "Test Both" to hear both channels together as a final check.
How It Works
This tool uses the Web Audio API to generate a tone and route it through a stereo panner node, sending audio exclusively to the left or right output channel. This bypasses any media file and tests your raw audio output path directly.
Understanding Your Results
- Sound plays correctly from the matching side - your speakers and channel routing are working correctly.
- Sound plays from the wrong side - check your OS audio settings for a channel swap, or your speaker cable connections.
- One channel is silent - check that speaker's power, cable, and volume individually before assuming a full failure.
- Sound plays from both speakers regardless of which channel you test - your system may be set to mono output in its audio settings.
Benefits
- Confirms stereo separation is correctly configured.
- Helps diagnose a "silent" speaker issue quickly.
- Useful after connecting new speakers, a soundbar, or a docking station.
Common Mistakes to Avoid
- Testing with system volume muted - double-check both the app and system volume levels.
- Wrong output device selected - confirm your OS is set to output audio to the correct speakers, not headphones or a different device.
Frequently Asked Questions
Why does no sound play at all?
Check that your system volume isn't muted, that the correct output device is selected in your OS sound settings, and that your browser has permission to play audio on this site.
Can this test surround sound speaker setups?
This tool focuses on standard left/right stereo channels. Multi-speaker surround setups typically need dedicated calibration tools provided by your sound card or receiver software.
Is the test tone recorded or does it access my speakers directly?
No recording happens - the tool only plays audio through your browser's standard audio output, the same way any website playing sound would.
Conclusion
This quick test confirms both your speakers and their left/right assignment are working correctly. If you're testing headphones instead, use the Headphone Tester for the same channel check.