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Use this sound test to check speakers, headphones, and headsets right in your browser: whether left and right channels are correct, whether a speaker's polarity is reversed, and which frequencies you can hear from 20 Hz to 20 kHz. It also includes individual test tones and a surround test if your output device reports more than 2 channels, as with a 5.1 or 7.1 setup.
Built by Justin Schuessler
Free, with no sign-up or download: All sounds are generated right in your browser; nothing is uploaded.
Sound good? Head over to your own TeamSpeak server.
Choose a test below. All sounds are generated in your browser; nothing is downloaded or uploaded.
Output device
Starts quietly. Set your device volume low first, then increase it here in small steps.
A short melody jumps between left and right. If you hear it on the side that lights up here, your speakers or headphones are the right way around. Center means equally loud on both sides.
Alternate switches sides every 3 seconds.
What did you hear?
Check your headset microphone too? Go to microphone test
Example result
After the left/right test, phase check, and sweep, the test summarizes your results. Three worked examples show the values the test produces for these clicks and answers. Your results depend on your device, room, and hearing.
Input: USB stereo headset, correct left and right channels, “In Phase” sounded fuller.
Sweep: Click at 0.90 s and at 19.65 s.
Result
Input: built-in speakers, correct left and right channels, no difference between the phases.
Sweep: Click at 6.60 s and at 19.40 s.
Result
Input: two bookshelf speakers, the melody came from the wrong side, “Out of Phase” sounded fuller.
Sweep: Click at 3.20 s and at 19.85 s.
Result
How the test calculates: The sweep runs exponentially from 20 Hz to 20 kHz in 20 seconds, about 2 seconds per octave. It subtracts 0.25 s of reaction time from each click. Bass: deep down to 40 Hz, full down to 80 Hz, limited down to 150 Hz, and barely audible above that. Treble: full from 16 kHz, normal from 12 kHz.
What the test checks
All checks run in one tool, and every sound is generated locally in your browser.
A short melody plays on the left, in the center, or on the right, alternating if you choose. Based on your answer, the test shows whether the channels are correct, swapped, or silent on one side.
The same melody plays once in phase and once with the right channel's polarity reversed. If the out-of-phase version sounds fuller, one speaker's polarity is reversed: Swap the two cable wires on that speaker only.
A tone sweeps from 20 Hz to 20 kHz over 20 seconds. From your two clicks, the test calculates your audible range and assesses bass and treble, whether you're using a subwoofer, laptop speakers, or headphones.
Fixed tones from 20 Hz to 20 kHz, or set your own frequency with a slider. Use them to pinpoint rattling, humming, or a silent tweeter.
If your output device reports more than 2 channels to your browser, a separate Surround tab appears. There, you can play each speaker individually or all of them in sequence. Gaming headsets with virtual 7.1 usually report only 2 channels.
A safety notice appears before the first sound. Volume starts at −30 dB, never exceeds −6 dB, and every sound fades in and out smoothly. Stop, Esc, or switching tabs stops the sound immediately.
How it works
From volume to frequency sweep, without an account or download.
Step 1
Turn down your device volume and select the output device above if your browser supports it. The test starts at −30 dB and never plays louder than −6 dB.
Step 2
Play the test melody on the left, right, and alternating sides. If it comes from the side that lights up, everything is connected correctly. Otherwise, the test tells you what to do.
Step 3
Compare “In Phase” and “Out of Phase.” If “Out of Phase” sounds fuller and comes from the center, one speaker has reversed polarity.
Step 4
Start the sweep from 20 Hz to 20 kHz and click when you first hear something and when the sound disappears. Use individual test tones to pinpoint hums, rattles, or a silent tweeter.
Fix error
How to recognize the most common test errors and what you can do about them.
The melody comes from the side that does not light up during the test.
The left or right channel is silent during the test.
In the phase check, “Out of phase” sounds fuller than “In phase.”
During the sweep, you only start hearing something at 150 Hz or higher.
Something vibrates along with a test tone, or you hear a hum.
The test is playing, but there’s no sound.
Voice chat
If you hear everything here but nothing in voice chat, the app is using a different device. Select the same output device there.
User Settings (gear icon) > Voice & Video: Output Device and Output Volume.
Choose the same device that works here instead of “Default.” On Windows, the volume mixer also controls how loud Discord is relative to the game.
Settings or Options > Playback: playback device, volume, and a test sound.
Create a separate playback profile for your headphones and speakers. Then switch between them with one click, without changing your system settings.
Discover more
Test your keyboard online: Check every key live, find broken keys, measure rollover, and detect double presses. Runs entirely in your browser.
Built by Luca Stanek
Test your screen in the browser: find dead pixels in full screen, measure Hz and FPS, check resolution, and test for ghosting, backlight bleeding, and color banding.
Built by Dimitri Heissler
Test your microphone online: check live levels, detect clipping and silence, listen to a recording, measure background noise, and compare Discord filters.
Built by Justin Schuessler
FAQ
Quick answers about left/right, phase, bass and treble, surround sound and your devices.
You get three results: whether left and right are correct, whether a speaker has reversed polarity, and your audible range from the sweep. In the example above, a gaming headset is audible from 25 Hz to 16.3 kHz, while laptop speakers start at 179 Hz. Up to 40 Hz, bass is considered deep; up to 80 Hz, full; above 150 Hz, there is barely any bass. Treble is full from 16 kHz and normal from 12 kHz.
Open this page, turn down the volume, and click one side in the left/right test. If the melody comes from that side, the speaker works. Then check the polarity with the phase test and the bass and treble with the frequency sweep. The test requires no download and works in Chrome, Edge, Firefox, and Safari.
Put on your headphones and click “Left”: You should hear the melody only in your left ear. With “Alternate left and right,” it switches sides every 3 seconds. If the sides sound reversed, your headphones are on backwards or the channels are swapped in your software.
For audio, run the left/right test and frequency sweep as you would for headphones. Select your headset above as the output device or set it as the default in your system's sound settings. With Bluetooth headsets in hands-free mode, the sweep often stops at around 7 kHz; the test shows this. Check your headset's microphone with our Microphone Test.
For the phase check, both sides play the same melody: once in phase and once with the right side's polarity reversed. If connected correctly, “In Phase” sounds fuller and comes from the center between the speakers. If “Out of Phase” sounds fuller instead, the positive and negative wires are swapped on one speaker. Swap the two cable wires on that speaker only.
Small speakers struggle to reproduce low frequencies: Laptop and monitor speakers often start above 150 Hz. For 20 to 40 Hz, you need a subwoofer or good headphones. At the high end, your hearing is usually the limiting factor: It declines with age, and many adults can no longer hear above 16 kHz. That's normal, not a defect.
Not at normal volume. The test starts at −30 dB, never plays louder than −6 dB, and fades each tone in and out gently. It becomes dangerous if you turn the volume up high for a barely audible low or high tone: Tweeters and hearing can be damaged even if you hear nothing. Start at a low volume and only put on headphones once the tone is playing.
Yes, if your output device reports more than 2 channels to the browser, such as an AV receiver over HDMI or a sound card with 5.1 output. The surround test then appears, letting you play each speaker individually or all in sequence. Gaming headsets with virtual 7.1 usually report only 2 channels because surround sound is created by the driver. In Windows, set the channels under Sound > Playback > Configure.
That depends on your browser. Chrome and Edge on desktop can route audio to another device, but only show its name after the page has been granted access to a microphone or camera. Firefox, Safari and most mobile browsers cannot switch the device in this test. In that case, switch devices in your system's sound settings.
First, use the left/right test here to check that the channels are correct. If they are, the issue is usually a setting: mono audio in Windows or macOS, virtual surround sound enabled in the headset driver as well as in the game, or an incorrect output format. Enable surround sound in only one place.
Then your device is working, but the app is playing through a different output. In Discord under Voice & Video and in TeamSpeak under Playback, select the same output device as here instead of “Default,” and check the app's volume in your system's volume mixer.
No. All tones and the test melody are generated in your browser using the Web Audio API. No audio file is loaded, and nothing is uploaded. Your answers and result stay on the page and disappear when you close it. The test goes silent immediately if you leave or switch tabs.
Yes, in current browsers on Android and iPhone. Turn off silent mode, or the iPhone will stay silent. You need headphones for the left/right test; most phone speakers play nearly mono. Select the output device in your phone’s system settings or Bluetooth menu.
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