Speaker Test

Check stereo channels and frequency response

This speaker test helps you confirm that your speakers or headphones are wired correctly and sound right. The channel test plays three short beeps panned fully to the left, fully to the right or to the center, so you can tell immediately whether the channels are swapped or one side is dead. Each side uses a slightly different pitch, which makes it easy to tell them apart.

The frequency sweep glides from 20 Hz to 20 kHz on a logarithmic scale while the current frequency is displayed. Listen for the point where bass fades in, for rattles or buzzing that reveal loose parts, and for where the treble disappears. The tone generator plays a steady sine, square, triangle or sawtooth wave at any frequency, which is handy for tracking down a specific resonance. White noise and pink noise are useful for comparing two sets of speakers and for checking that both channels sound equally loud.

Choosing an output device

In browsers that support it, you can send the sound to a specific output — for example your monitor speakers, a USB headset or Bluetooth earbuds — without changing your system default. Browsers hide device names until a media permission is granted; the tool can briefly request the microphone to list them and releases it immediately. All audio is generated live in your browser with the Web Audio API.

Troubleshooting speaker problems

If you hear nothing, check that the correct device is selected in your system sound settings, that the tab is not muted and that the volume slider here is above zero. Browsers only allow audio after a click, so press a test button rather than expecting sound on page load. Bluetooth headphones can add a delay of a few hundred milliseconds. Always start quietly: high tones and noise at full volume can be unpleasant and may damage small speakers or your hearing.