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SPCXTools

Speaker Test

Check left and right channels, bass and treble on speakers and headphones with test sounds.

Runs locally — files never leave your device

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How to use Speaker Test

  1. 1Turn your system volume down to a comfortable level first.
  2. 2Click Left, Both and Right to play a pulsing test sound in each channel and confirm it comes from the correct side.
  3. 3Run the Frequency sweep to hear the full range from deep bass to high treble, noting where sound fades or rattles.
  4. 4Use the Tone generator to play a steady tone at any frequency from 20 Hz to 20,000 Hz.

Test your speakers and headphones

Is sound coming from both speakers? Are your headphones' left and right channels the right way round? Can your speakers reproduce bass? This online speaker test answers those questions with three simple tools: a stereo channel test, a full-range frequency sweep and an adjustable tone generator. All sounds are generated live in your browser — there's nothing to download.

What's included

  • Left / Both / Right channel test using pulses of pink noise, panned fully to one side, to verify stereo wiring and balance.
  • Frequency sweep from 20 Hz to 20 kHz over ten seconds, with the current frequency shown on screen.
  • Tone generator with a logarithmic frequency slider from 20 Hz to 20 kHz.
  • Volume control that adjusts smoothly while sound is playing.

Common uses

New speakers or headphones. Confirm both channels work and are wired correctly before setting up a home cinema, desk speakers or a gaming headset.

Troubleshooting one-sided sound. If audio only comes from one side, the channel test tells you whether the problem is the speaker, the cable or a balance setting. Wiggle cables and connectors while the test plays to find loose contacts.

Checking frequency response. The sweep shows the practical range of your speakers. Listen for where bass starts (and whether it rattles) and where treble disappears. A subwoofer should pick up below about 80–120 Hz.

Testing your hearing range. Use the sweep or tone generator with good headphones at low volume to find the highest frequency you can hear. This is a fun experiment, not a medical hearing test.

Speaker troubleshooting tips

  1. Check the output device in your operating system's sound settings — audio may be going to a monitor, Bluetooth device or HDMI output.
  2. Check the balance slider in system sound settings, which can silence one side.
  3. Swap cables or ports to see whether the problem follows the cable or stays with the speaker.
  4. Disable sound enhancements such as virtual surround if channels sound strange.
  5. Update or reinstall audio drivers if no sound plays at all.

Testing a call setup? Check your input with the Mic Test and your camera with the Webcam Test.

Frequently asked questions

How do I know if my left and right channels are swapped?
Click Left. If the sound comes from the right speaker or earcup, the channels are reversed — check that the speakers are connected to the correct outputs, or that headphones are worn the right way round (look for L and R markings). Also check balance settings in your operating system.
Why does the left and right test sound like noise rather than a beep?
The channel test uses short bursts of pink noise, which contain all frequencies. People locate the direction of noise much more easily than a pure tone, so it is better for checking stereo placement.
I can't hear the highest frequencies in the sweep. Is something wrong?
Not necessarily. Human hearing typically ranges from 20 Hz to 20 kHz in young people, and the upper limit drops with age — many adults hear nothing above 14–16 kHz. Small laptop and phone speakers also can't reproduce deep bass below about 100–200 Hz.
What causes rattling during the sweep?
A buzz or rattle at specific frequencies often comes from loose objects or panels resonating, a damaged speaker cone, or a loose grille. Note the frequency where it happens, then check the speaker and its surroundings.
Can a test tone damage my speakers or hearing?
Pure tones at high volume can be uncomfortable and, over time, harmful to hearing — especially high frequencies through headphones. Always start at a low volume. Very low bass tones at high volume can also overdrive small speakers.
Is any audio data sent to a server?
No. All sounds are generated in your browser with the Web Audio API.

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