Test your stereo speakers or headphones. Ensure you can hear discrete audio from both the left and right channels, and explore the frequency range your equipment can reproduce.
Speaker Test: Check Your Left and Right Audio Online
If you've ever joined a call and realized halfway through that only one earbud was working, you know why a quick speaker test is worth running before anything important. This tool lets you check your speakers or headphones directly in your browser, with separate tests for the left channel, right channel, and both together.
There's no software to install and nothing to sign up for. Play a tone, listen, and confirm both sides of your audio setup are working the way they should.
Why Test Your Speakers Before a Call or Stream
Audio issues are easy to miss until they cause a problem. A loose cable, a muted channel, or a Bluetooth pairing that only sends sound to one ear can go unnoticed for weeks — especially if you rarely use headphones for anything other than music, where both channels often carry similar audio.
A speaker test can catch a few common issues:
- One channel is silent while the other works fine
- Audio is coming from the wrong output device
- Volume is uneven between left and right
- A cable, port, or Bluetooth connection is loose or dropping out
- The frequency range sounds off compared to what you'd expect
Running this before a video call, a stream, or a recording session takes a few seconds and can save you from a confusing "wait, can you hear that?" moment later.
How to Use the Speaker Test Tool
The test is built around three simple checks:
- Test Left — plays audio through the left channel only. If you hear nothing, or sound is also coming from the right side, something's off.
- Test Right — plays audio through the right channel only, the same way.
- Test Center — plays both channels together so you can confirm overall output and balance.
Below the channel tests, the tone generator lets you adjust frequency from 20 Hz up to 20 kHz and set the volume level. This is useful if you want to check how your speakers or headphones handle different pitches, from deep bass to high treble, rather than just confirming they turn on.
Testing Headphones vs. Speakers
The left/right test works the same way whether you're using headphones, earbuds, or external speakers — but each has its own common failure points worth checking.
For headphones and earbuds, a quiet or silent channel is often a connection issue: the plug isn't fully seated, a Bluetooth earbud has lost its pairing to one side, or the cable has a break near the jack, which is a common failure point for wired headphones. For external speakers, check that both are physically connected and powered, and that your system's output device is set correctly — it's possible for a computer to send sound to a monitor's built-in speakers instead of your external pair.
If you're only hearing sound from one side during the Test Center check, isolate the issue with Test Left and Test Right individually — that will tell you whether it's a single dead channel or a balance problem.
Troubleshooting: No Sound From One or Both Channels
If the test doesn't produce sound the way you expect, work through these steps.
Check the Correct Output Device Is Selected
If you have more than one audio output connected — say, headphones and speakers, or a monitor and a soundbar — your system might be sending audio to the wrong one by default. On Windows, this is managed in Sound settings, and Microsoft's sound troubleshooting guide covers switching the default playback device. On a Mac, it's under System Settings > Sound > Output, covered in Apple's support documentation.
Check the Volume Level
Confirm the volume isn't muted or turned down at the system level, the browser tab level, or the device itself. It's easy to have one of these lowered without realizing it.
Test the Cable or Connection
For wired headphones or speakers, gently wiggle the cable near the jack while the test tone is playing. If the sound cuts in and out, the cable itself is likely the problem.
Re-Pair Bluetooth Devices
If you're using wireless headphones or a Bluetooth speaker and only getting sound from one side, try unpairing and reconnecting the device. A partial or dropped Bluetooth connection can sometimes affect only one channel.
Try a Different Browser or Refresh the Page
Occasionally a browser tab holds onto an outdated audio device list, especially after switching between headphones and speakers. Refreshing the page or trying a different browser can rule this out.
Common Reasons a Speaker Test Fails
A few less obvious causes worth knowing about:
- Outdated audio drivers. On Windows, an out-of-date driver can cause uneven or missing channel output even when the hardware is fine.
- Software mixing settings. Some system audio settings can accidentally downmix or reroute channels, making a stereo signal sound mono.
- Damaged or worn cable. Frayed wiring near the jack is one of the most common causes of a single dead channel in wired headphones.
- Bluetooth codec or driver issues. Certain Bluetooth audio drivers can occasionally send an incomplete signal to one earbud.
Frequently Asked Questions
Does this test check my microphone too?
No — this tool is focused on speaker and headphone output. If you want to check your microphone, use the microphone test.
Can I use this to test earbuds?
Yes. The left, right, and center tests work the same way for earbuds and headphones as they do for external speakers.
Why does the tone sound different at low and high frequencies?
Most speakers and headphones aren't equally responsive across the full frequency range. It's normal for very low or very high frequencies to sound quieter, since not every device reproduces the extremes evenly.
Why is only one side working?
This is usually a connection issue — a loose cable, an unpaired Bluetooth earbud, or the wrong output device selected. Work through the troubleshooting steps above to narrow it down.
Do I need to install anything to run this test?
No installation is required. The test runs directly in your browser using the tone generator built into this page.
Check Your Other Hardware Too
If you're setting up for a call or stream, it's worth checking your other input and output devices while you're at it. Try the webcam test to confirm your camera, the microphone test to check your mic, the keyboard test to verify every key registers, or the mouse test to check buttons, scroll, and cursor tracking.
Ready to Test Your Speakers?
Before your next call, stream, or listening session, take a few seconds to run the speaker test above and confirm both channels sound the way they should.