Left right audio test: check earbuds, headphones and speakers on your mobile

How to do a left right audio test

Open the online speaker test and set the volume to around half. Tap Left, then Right, then Both. The test plays a steady tone on one channel at a time, so there is no music to mask a missing side.

With headphones or earbuds on, the Left tone should sit in your left ear only and the Right tone in your right ear only. With both channels playing, the sound should feel centred, as if it comes from the middle of your head.

For a pair of speakers, stand between them at an equal distance. Left should come from the left speaker, Right from the right one. If they are reversed, the cables or the speaker positions are swapped, which is an easy fix and does not mean anything is broken.

One side silent: a setting, a connection or a faulty earbud or speaker.
One side softer: balance setting, dirty mesh or a worn driver.
Both tones in both ears: Mono Audio is on, or the source is mono.
Left and right reversed: headphones worn backwards or speaker cables swapped.

Check balance and Mono Audio first

Most "one side not working" cases are settings, not hardware. Two accessibility options cause them: a balance slider that has drifted to one side, and Mono Audio, which mixes both channels into one so the left right test can no longer tell them apart.

On iPhone and iPad, go to Settings > Accessibility > Audio & Visual. Make sure the Balance slider is in the middle and turn Mono Audio off if you want true stereo.

On Samsung Galaxy phones, go to Settings > Accessibility > Hearing enhancements. Check Left/right sound balance for both connected audio and the phone speakers, and the Mono audio switch. On other Android phones, look in Settings > Accessibility for audio balance or mono audio; the exact menu names vary by manufacturer.

On a Mac, open System Settings > Sound, choose your output device and centre the Balance slider. On Windows 11, open Settings > System > Sound, select the device, and in its output settings make sure the left and right levels match; the Mono audio switch is on the same Sound page.

Wired headphones: one side silent or crackling

Push the plug all the way in, then rotate it slowly while the Left tone plays. If the missing side comes and goes as you turn or wiggle the plug, the fault is in the plug, the socket or the adapter, not the earpiece.

Flex the cable gently along its length, especially near the plug and where it splits to each ear. A side that cuts out when one spot is bent points to a broken wire inside the cable. Try a second pair on the same phone and the same pair on another device to see which part is at fault.

AirPods and Bluetooth earbuds: one side not working

Apple's steps for one silent AirPod are simple: put both AirPods in the charging case for 30 seconds, open the case near your iPhone, check that each one is charging, then test again. If it still fails, reset the AirPods.

If one AirPod is just softer, remove the ear tips and look at the speaker mesh. Earwax and lint on the mesh muffle one side, and cleaning it often brings the level back. Then check that the Balance slider is still centred.

Other Bluetooth earbuds follow the same logic: charge both buds, check the battery level of each, remove the pairing and pair again. On Windows, Microsoft also suggests checking that the device output format is set to 2 channels and installing the manufacturer's firmware updates.

Phone speakers: testing left and right on iPhone and Android

Many recent mobiles play stereo through two speakers: the bottom speaker and the earpiece above the screen. Turn the phone to landscape and run the test. A side that is silent or much weaker often maps to a blocked or wet grille rather than a dead speaker.

A browser uses the phone's normal stereo output and cannot reliably address the earpiece and the bottom speaker separately. The Wring app's Speaker Test can play the phone's speakers separately or together on compatible phones, which makes a weak earpiece easier to spot. If one grille is dusty, follow how to clean a phone speaker before you assume the speaker is damaged.

Wring is free with ads and limits; Pro removes both. Get it on the App Store or Google Play.

Going further: sweep and frequency checks

Once both channels play, run the sweep on the speaker test for each side. A clean speaker glides smoothly from low to high; a damaged one has gaps or buzzing at certain pitches. Comparing the two sides within a few seconds is more reliable than memory.

For low frequencies, a bass test with steady tones shows whether a subwoofer or a pair of headphones reaches the deep end evenly on both sides.

What not to do

Keep the safety basics in mind while you troubleshoot a missing channel.

Do not turn the volume to maximum to hear a weak side. Steady test tones are tiring at high levels and can harm your hearing.
Do not push pins, needles or toothpicks into the headphone jack, the earbud mesh or a phone grille.
Do not blow compressed air into a phone speaker or an earbud; it can push debris deeper and damage the membrane.
Do not charge earbuds or a phone that is still wet.

When to get the headphones or speaker repaired

If the balance is centred, Mono Audio is off, and the same side stays silent on another mobile or computer, the earbud, the cable or the speaker itself is faulty. Contact the manufacturer or a repair shop; AirPods and Beats are covered by Apple support. If your phone's own speaker is the problem, the steps in iPhone or Android speaker not working help you rule out software before you take it in for repair.

Quick answers

Why do I hear the left tone in both ears? Mono Audio is turned on, or the app or video you use is mono. Turn Mono Audio off in accessibility settings and test again.

Why is my left earbud softer than the right? Usually a clogged mesh or a balance slider moved off centre. Clean the mesh gently and centre the balance before you assume the earbud is broken.

How do I know which earbud is left? Most headphones mark L and R on the band, the stem or inside the ear cup. Run the Left tone: the earpiece that plays it is the left one.

Can a browser test the phone earpiece separately? Not reliably. A web page uses the normal stereo output, so use the phone in landscape or an app that can address each speaker.