Start at a low, comfortable volume. Stop if the sound is uncomfortable.
Speaker response, hearing and output routing affect what you hear. This is not a hearing test. Avoid turning up the volume to chase frequencies you cannot hear.
Generate sine-wave tones to compare left and right output, or listen to a gradual frequency sweep. Sounds are generated in your browser. Start quietly and use the Stop control whenever needed.
How to use this tool
Select a tone, then test left, both or right channels. Confirm which physical speaker you hear. The sweep moves from 20 Hz to 20 kHz over 20 seconds. Stop before changing your audio equipment.
What this test can and cannot show
Mono output, accessibility settings and device routing may combine stereo channels. Older browsers without a stereo panner cannot isolate channels and will show a warning. Missing frequencies can reflect equipment or hearing, so this is neither a calibrated measurement nor a hearing test.
Updated October 1, 2026. Browser and device support varies.
Questions and troubleshooting
Why do both speakers play when I select one channel?
Check whether mono audio is enabled in your device’s accessibility settings and confirm the selected output. Some equipment combines channels. If the browser cannot isolate stereo channels, this tool displays a warning and plays both.
What should I check when there is no sound?
Select a tone and click a channel control to start audio. Check browser and system mute, the output device and its connection. Begin at a low volume. The test cannot determine speaker response or hearing sensitivity from silence.
How this tool was checked
Automated Chromium checks on October 1, 2026 verified a 440 Hz tone, left/right control requests and stopping Web Audio. Physical sound output, acoustic levels and channel separation were not measured.
Technical references: MDN: Web Audio API