How to run a sound test
- Connect the speakers or headphones you want to check and set the volume to about half.
- Tap Left. You should hear three short bursts from the left side only. Then tap Right.
- Tap Both. The sound should seem to come from the middle, between the two speakers.
- Run Auto to switch sides back and forth while you adjust speaker placement or test a cable.
What a healthy result sounds like
Each side plays only from its own speaker, both sides are equally loud, and “Both” sounds centred. If the centre sound leans to one side, adjust the balance setting or move the speakers so they're the same distance from you.
Testing headphones and earbuds
Put both earbuds in and run Auto. The left bud should play when the left speaker lights up. If one bud is quieter, clean its mesh with a dry, soft brush. Earwax build-up is the most common cause. Then run the test again. For AirPods, also check the balance setting in your iPhone's accessibility settings.
Testing a laptop or PC
Most laptops have stereo speakers on the left and right edges or under the front. Choose the built-in speakers in your sound settings, unplug headphones, then run the test. If the sides seem reversed on external speakers, the cables are probably plugged into the wrong outputs.
Speaker sounds damaged rather than missing?
This test checks which channel plays. To find buzzing, rattling or dead frequencies, use the speaker test sweep. To check low-end response, run the bass test. If a phone speaker sounds muffled after getting wet, start with the water eject sound.
Common questions
The left sound came from the right. What’s wrong?
Your channels are swapped. On headphones you may be wearing them backwards, so look for the L and R marks. On wired speakers, swap the two cables at the amplifier or speaker end. On Bluetooth speakers, check the app for a “swap channels” or stereo-pair setting.
Why does Left sound the same as Right?
Either Mono Audio is switched on, or the device has one speaker. On iPhone go to Settings → Accessibility → Audio & Visual → Mono Audio. On Android it’s under Settings → Accessibility → Audio. On Windows open Settings → Accessibility → Audio. On Mac open System Settings → Accessibility → Audio.
One side is completely silent. Is it broken?
Check the balance slider first: Windows sound settings, Mac Sound → Output → Balance, or the accessibility settings on a phone. If balance is centred, try a different cable or device. If the same side stays silent everywhere, that speaker or earbud has failed.
Should I use noise bursts or tone beeps?
Noise bursts are easier to place in space, so they’re best for checking which side is which. Tone beeps use a slightly different pitch per side, which makes them useful for spotting crackle or distortion in one channel.