A speaker test plays known sounds so you can check that each speaker or earbud works and is on the correct side. This one plays three short 440 Hz beeps in the left channel, the right channel or both, and a 15-second sine sweep from 20 Hz to 20 kHz that you can stop at the point where the sound disappears. You mark each result as Heard or Not heard yourself.
| Result | Likely cause | What to check |
|---|---|---|
| Left and Right both heard on the correct side | Stereo works | Nothing to fix |
| Left plays from the right side | Headphones worn the wrong way or channels swapped | Check the L/R marks; check speaker cables |
| Left and Right sound the same from both sides | Mono audio is on, or a Bluetooth headset is in hands-free mode | Turn off Mono audio; close apps using the headset mic |
| One side never heard | Balance set to one side, loose plug, or one earbud disconnected | Balance settings, plug fully in, reconnect the earbud |
| Sweep silent until a few hundred Hz | Small speakers cannot play deep bass | Normal for laptop speakers; try headphones |
How to do a left right audio test
Turn the volume down, press Left, then Right, and answer Heard or Not heard after each one.
The test uses Web Audio stereo panning: −1 sends sound only to the left channel, +1 only to the right, and Both plays it centered. Each button plays three beeps over about 1.2 seconds. The results list shows your answers for Left, Right and Both, and if you mark a side as not heard, the test shows where to check balance.
Speaker frequency test: 20 Hz to 20 kHz sweep
Press Play sweep and press Can't hear it now when the tone fades out. The test records that frequency as Highest frequency heard.
The sweep rises exponentially, so each octave takes the same time: about 1.5 seconds per octave across roughly ten octaves. Halfway, at 7.5 seconds, it is near 632 Hz; at 12 seconds it is near 5,024 Hz. That means most of the 15 seconds is spent in the low and middle range, and the top octave from 10 to 20 kHz goes by quickly.
The number reflects both your speakers and your ears. The upper limit of hearing drops with age. In a 2021 study of 162 healthy adults, about half (52.2%) of those under 30 responded to 20 kHz, while no one in the 51 to 60 group did. So stopping at 15 kHz is not proof that a tweeter is broken. Compare the same speaker with headphones before blaming it.
Is a speaker test safe for my ears and speakers?
Yes, if you start low. Set the system volume low before the first beep and raise it slowly.
The test plays at a modest fixed level, but earbuds sit close to the ear and a pure sine tone can sound louder than music at the same setting, especially at high frequencies. Do not raise the volume to chase a tone you cannot hear: if it is above your hearing range, turning it up only adds risk to your ears and small speakers.
How to fix audio balance on Windows 11 and Mac
On Windows 11, open Settings > System > Sound, select the output device, and set the Left channel and Right channel sliders to the same value. Some devices show the control only in More sound settings > Properties > Levels > Balance. Mono audio, found in Settings > Accessibility > Audio, merges both channels and makes a left-right test sound centered, so turn it off for testing.
On a Mac, go to System Settings > Sound > Output, select the device and center the Balance slider.
Why Bluetooth headphones sound mono or low quality
When any app uses a Bluetooth headset's microphone, the headset switches to the hands-free profile, which is mono and much lower quality.
For music, headphones use the A2DP profile, which carries stereo. A call app, a game voice chat, or a browser tab running a mic test can trigger the switch, and the left-right test then sounds the same on both sides. Windows often lists such a headset twice, once as headphones and once as a hands-free headset. Close the app using the mic, or pick the stereo entry as the output, and test again.
FAQ
Why can I not hear the start of the sweep?
Tones around 20 Hz need a large driver. Laptop and phone speakers usually cannot reproduce them, so silence for the first few seconds is normal on small speakers.
What does Both test?
Both plays the same beeps in both channels at equal level. The sound should seem to come from the center between your speakers.
Is the sweep panned left or right?
No. The sweep plays in both channels. Use the Left and Right buttons for the channel check.
Why is my highest frequency lower than 20 kHz?
The upper limit of human hearing declines with age, and many speakers roll off at the top end too. Compare with a different pair of headphones to see which one limits you.
Sources: W3C Web Audio API (StereoPannerNode, OscillatorNode) · Wang M. et al., Extended high-frequency audiometry in healthy adults with different age groups, Journal of Otolaryngology - Head & Neck Surgery, 2021 · Apple Support: Change the sound output settings on Mac · Windows 11 Settings: System > Sound (Left channel / Right channel), Accessibility > Audio (Mono audio) · Bluetooth SIG: Advanced Audio Distribution Profile (A2DP) and Hands-Free Profile (HFP) · Updated 2026-10-14