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Speaker Test

Press a button to play the left, center or right channel, a 20 Hz to 20 kHz sweep, or in-phase and out-of-phase noise. Every sound is generated in your browser, and the default volume is a quiet −24 dBFS.

On-device・No upload

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Left
Current frequency— HzShown while a tone or sweep plays
Right
−24 dBFS

0 dBFS is the maximum output. Lower numbers are quieter.

Stopped

Esc also stops
Left / right channels

Play a voice-like chirp from the left, center or right. The L and R tiles light up on the side that is sounding.

If pressing Left plays from your right side, left and right are swapped. Check the L/R marks and orientation of your earphones or headphones, the speaker wiring, and any balance or channel-swap setting in the OS or app.

Phase check

Plays the same pink noise on both sides (in phase) and the same noise with the right side inverted (out of phase). In phase is heard as one point in the middle; out of phase is vague and wide.

If the in-phase noise still sounds vague, one speaker may be wired with + and − reversed.

Out-of-phase noise nearly cancels on a mono output (some Bluetooth modes or single-ear mode) and may be almost silent.

Frequency sweep

Rises from 20 Hz to 20 kHz on a logarithmic scale (the same time per octave). Use it to find where the sound changes, drops out or distorts.

You can record while the sweep is playing or paused.

Audible range you recorded (a rough guide)

Start hearing
Not recorded
Stop hearing
Not recorded

Small speakers and earphones can barely reproduce anything below 50 Hz or above 16 kHz in the first place.

This is not a medical hearing test. The result also depends on your speakers or earphones, the room and the volume. If you are worried about your hearing, see a doctor or have an audiogram done.

Play a specific frequency

Plays 20 Hz to 20 kHz with the slider (logarithmic scale). Moving it while playing changes the pitch smoothly.

1.00 kHz

Do not play low tones (60 Hz and below) or high tones (12 kHz and above) for a long time.

Noise

Useful for checking volume or speaker balance. Pink noise has more bass and sounds natural; white noise is even across all frequencies and sounds like a hiss.

Noise sounds louder than a tone at the same dBFS. Start with a low volume.

Output device

Sounds are generated and played on your device. No audio files are loaded and nothing is sent.

How to use

  1. Lower your device and OS volume first, and check that the Volume slider on this page is low.

  2. Under “Left / right channels”, press “Play left” and check that the sound comes from the left only. Try center and right too. The L and R tiles light up on the sounding side.

  3. Press “Play sweep” to hear the pitch rise from 20 Hz to 20 kHz. Press the mark buttons where you start or stop hearing it to get a rough audible range.

  4. To check a specific pitch, use “Play a specific frequency” with the slider or a preset.

  5. Use the phase check and noise to test speaker wiring and balance. To stop, press “Stop all” at the bottom of the screen or the Esc key.

What it does

Voice-like chirps to tell left from right

Instead of a plain beep, a short voice-like chirp is used, which makes it easier to judge where a sound is coming from. The sounding side also lights up as L and R.

Log sweep with a big frequency readout

Sweeps 20 Hz to 20 kHz in 10, 15 or 20 seconds and shows the current frequency in large type. You can pause and resume, and mark where you start and stop hearing it.

Phase check (in and out of phase)

Plays pink noise with both sides identical (in phase) and with the right side inverted (out of phase), so you can spot reversed speaker wiring and see how mono output cancels sound.

Built for safe listening

The default is −24 dBFS, and volume is limited to −60 to −6 dBFS. Playback fades in and out over about 0.1 seconds to avoid clicks, stops by itself after 60 seconds, and Esc stops it at any time.

Choose the output device

In browsers that support setSinkId, such as Chrome and Edge, you can pick the speaker or headset right on the page. Other browsers are told so clearly.

Use cases

  • Check that a new pair of earphones or headphones is not swapped left to right
  • Verify the wiring (L/R and + −) of PC or monitor speakers
  • Get a rough idea of where sound drops out, as a guide to a speaker’s range
  • Switch between Bluetooth or USB audio outputs to find the one that makes sound
  • Narrow down a fault such as one side being quieter or noisy

Capability matrix

FeatureSupportNotes
Left, center and right playback with a display of the sounding sideSupported—
20 Hz to 20 kHz log sweep (10, 15 or 20 s; pause and resume)Supported—
Play a chosen frequency (slider and presets)Supported—
In-phase and out-of-phase pink noise, pink and white noiseSupported—
Output device selectionPartialNeeds setSinkId (Chrome, Edge and similar). In Safari and Firefox use your OS sound settings
Audible range logPartialA self-reported guide. It depends on your equipment and volume and is not a medical hearing test
Tests for 3 or more channels such as 5.1 or 7.1Not supportedOnly 2-channel stereo (left and right) is supported
Measuring speaker frequency response or sound pressureNot supportedThe output is not measured with a microphone; this only helps you check by ear

Limits & notes

  • Playback starts only when you press a button (browser autoplay policy) and stops by itself after 60 seconds.
  • Volume is limited to −60 to −6 dBFS. The number is the signal level, not real-world loudness (dB SPL); a loud device volume makes even low numbers loud.
  • Switching the output device works only in browsers that support setSinkId.
  • Bluetooth devices may clip the start of a sound or play it with a delay right after connecting.
  • For safety, playback stops when you switch tabs or hide the page.

Privacy & safety

All sounds are generated and played in your browser. No audio files are loaded and nothing is sent to a server. The audible range you record is gone when you close the page.

FAQ

How do I check whether my earphones are swapped left to right?
Press “Play left”. If the sound comes only from your left ear, they are fine. If it comes from the right, check the L/R marks and how you are wearing them. If it is still reversed, check the balance or channel-swap setting in your OS or app and the speaker wiring.
How high should I hear in the frequency sweep?
Young adults often hear up to around 16 kHz, and high frequencies fade with age. Speakers and earphones also have their own limits, so treat the result as a rough guide. It is not a medical diagnosis.
What does the out-of-phase noise tell me?
With the left and right waveforms inverted, the sound normally becomes vague and spreads outside your head. If the in-phase noise is also vague, one speaker may be wired with + and − reversed. On a mono output, out-of-phase sound cancels and is almost silent.
What if I hear nothing?
Check the OS output device and mute, and the volume of your device and the browser tab. On iPhone the silent switch can also mute it. In Chrome and Edge you can pick the device under “Output device”.
Is it safe to play very low or very high tones for a long time?
Avoid it. Tones below 60 Hz or above 12 kHz can be unpleasant or stress speakers even at low volume. This tool stops after 60 seconds and starts at a low volume.

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