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Sound Test Left and right speaker test and audio check

Turn your volume down a little, then press Left or Right. The sound should come only from that side.

Speakers

Stereo

Press a speaker to play a sound on that side.

Frequency sweep

20 Hz

Press Stop the moment the sound appears or fades, and the frequency stays on screen.

Phase and noise

40%

This only scales the test sound. Your device volume still applies, so start low and turn up.

Output channels
–
Sample rate
–

The browser reports these after the first sound. Most browsers mix everything down to 2 channels, so surround buttons appear only when your device offers 6 or more.

Every sound is generated in your browser. No audio files are downloaded and nothing is recorded.

How to test your speakers

Check left and right

Press Left and listen for bursts of noise from the left speaker only, then do the same with Right. Both should sound as if it comes from the middle. Noise is used because the ear places it more easily than a pure tone.

Find your frequency range

The sweep rises from 20 Hz, the lowest pitch most people hear, to 20,000 Hz over 20 seconds. Note where the sound first appears and where it disappears. Small speakers usually start late, and the top end depends on your ears as well as the speakers.

Check the wiring

Play In phase, then Out of phase. With correct wiring, in phase sounds solid and centred, and out of phase sounds thin and hard to place. If it is the other way round, the + and − wires on one speaker are swapped.

Speakers not working? Check in this order

  1. Volume and mute. Turn the device volume up and press the mute key once in case it is on. On iPhone, the Ring/Silent switch also mutes web pages, so switch it to Ring.
  2. Browser tab. A crossed-out speaker on the tab means the site is muted. Right-click the tab and unmute it.
  3. Output device. Sound may be going to a monitor, a headset or a Bluetooth device. On Windows, open Settings › System › Sound and choose the output. On a Mac, open Control Centre › Sound.
  4. Bluetooth. Make sure the speaker is connected to this device and not still paired to a phone nearby.
  5. Other apps. Play a video in another tab. If that is silent too, the problem is the device or its driver, not this page. Restart the browser, then the computer.
  6. Cables. For wired speakers, check power, the volume knob and that the plug is in the green or headphone socket.

One side is quiet or swapped

Check the balance setting

A balance setting turned to one side makes a speaker quiet or silent. On Windows, open the output device in Sound settings and set the left and right channel volumes equal. On a Mac, centre the Balance slider under Sound › Output.

Left and right swapped

Speakers placed on the wrong sides are the usual cause, so check the labels on the back. With headphones, check that L is on your left ear. Some sound software has a channel swap option that may be switched on.

Sound test FAQ

Why can't I hear the lowest part of the sweep?

Laptop, phone and small desktop speakers are too small to move much air at low pitches, so they often stay silent until the sweep reaches around 100 Hz or more. Headphones and speakers with a subwoofer go lower.

Why does the sound fade before 20,000 Hz?

The highest pitch people hear drops with age, often to 15,000 Hz or below in adults, and many speakers roll off before 20 kHz too. Try the same sweep on headphones to tell the two apart.

Can I test 5.1 or 7.1 surround sound?

Only when your browser offers more than two output channels. When it reports 6 or more, a set of surround buttons appears. Most browsers mix everything down to stereo, so a home theatre system gets the same signal as two speakers.

Can a sound test damage my speakers?

At sensible volume, no. Loud low-frequency sweeps can push small speakers past their limit, so keep the test volume moderate and stop if you hear rattling or distortion.

Does it work with Bluetooth headphones and speakers?

Yes. The sound starts a moment later because Bluetooth adds delay, and some Bluetooth devices switch to mono in call mode, which makes Left and Right sound the same.

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