Left right audio test
A quick stereo test: confirm which side is which on headphones, earbuds or speakers, and hear a smooth pan across the stereo field.
Volume first. Turn your device volume down before pressing play, then raise it slowly. Tones start quiet on purpose. Keep headphones off your ears until you know how loud it is.
Now playing: Silent
What the results mean
| You hear | Likely cause |
|---|---|
| Left and right in the correct place | Your stereo channels are fine. |
| Left and right reversed | Headphones on backwards, or speaker cables swapped. |
| Both buttons play from both sides | Mono audio is on in accessibility settings, or the device or cable is mono. |
| One side silent | Balance slider set fully to one side, a half-inserted 3.5 mm plug, a broken cable or a dead earbud. |
| Pan sweep jumps instead of gliding | Some Bluetooth or "spatial audio" processing. Try turning spatial audio or virtual surround off. |
Why a half-plugged jack sounds strange
A 3.5 mm headphone plug has separate contacts for left, right and ground. If it is not pushed fully home, one channel can lose contact, or the left and right signals can partly cancel through a shared ground, leaving voices faint and music sounding hollow. Push the plug in until it clicks and run the test again.
Questions people ask
How do I do a left right audio test?
Press Left, then Right. With headphones the sound should appear in the matching ear; with speakers it should come from the matching speaker. Centre should sound like it is coming from straight in front of you or inside your head.
Left and right are swapped. How do I fix it?
For headphones, check you are wearing them the right way round (look for L and R markings). For speakers, swap the cables at the amplifier or computer. Some apps and Windows audio enhancements can also swap channels.
I hear both sides in both ears. Why?
Mono audio is probably switched on. On iPhone look under Settings › Accessibility › Audio & Visual › Mono Audio; on Android, Settings › Accessibility › Audio; on Windows, Settings › Accessibility › Audio › Mono audio; on macOS, System Settings › Accessibility › Audio.
One side is quieter than the other. Is it my ears?
Start with the equipment: check the balance slider in your sound settings, clean earbud mesh, and swap the headphones round to see if the quiet side moves. If the quieter side always follows the same ear, compare with the hearing test and see an audiologist if it persists.
Keep testing
- Headphone testChannels, phase, bass extension and treble in one pass.
- Speaker testChannel, range and polarity checks for stereo speakers.
- Hearing testA quiet-tone check of each ear at six frequencies. Not a diagnosis.