AirPods / earbuds
Wear both buds. If one side is quiet, clean the mesh — then retest. Moisture after workouts is a common cause; Water Eject may help the phone, not the buds’ battery compartment.
Headphone Test
Confirm left and right drivers, stereo imaging, and whether highs and lows still play before you replace a pair of headphones.
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On iPhone, turn the Ring/Silent switch to Ring or the page will stay silent.
Wear both sides. Left should stay in the left ear only. Bluetooth spatial audio can smear the image — turn it off for a cleaner left/right headphone test.
READY
Short answer
Play Left, then Right. Each tone plays on one side only, so you should hear it in one ear. If both play in the same ear, the headset may be mono or one driver has failed. Then run the sweep: a driver can pass a midrange beep and still drop out on bass or treble. Retest wired to rule out Bluetooth.
How to use it
- Put the headphones on. Seat both earcups or earbuds. For AirPods, wear both sides and disable Adaptive Audio if it ducks the test.
- Set a comfortable volume. Start low. In-ear drivers can get loud quickly. The tool already caps peak gain.
- Test left, right, then stereo. You should hear Left only in the left ear, Right only in the right ear, then a centered stereo pair.
- Sweep the range. If one side drops out on bass or treble, note it. That is often a failing driver, not a “balance” setting.
How this headphone test works
Each clip is a generated tone. Left is panned fully left, Right fully right, then a short stereo phrase. The frequency sweep moves from low bass to airy treble so a failing driver is harder to miss than with a single beep.
A full headphones test takes about a minute, and it is worth doing before you buy a replacement. Many “dead” earbuds turn out to be a dirty mesh, a Bluetooth pairing glitch, or spatial audio folding the sound into one side.
Left and right headphone test: what a pass looks like
| What you hear | What it means |
|---|---|
| Left in the left ear, Right in the right ear | Both channels work and are the right way round |
| Left and Right both in the same ear | Mono audio is on, or the headset is mono |
| Right in the left ear and left in the right | Swapped channels — check the earbuds are in the right ears, or the adapter |
| One side never plays | A dead driver, a broken cable, or a bud that is not connected |
| Both play, but one is clearly quieter | Balance setting, a clogged mesh, or a weakening driver |
Run it both ways — left then right, and right then left — if you are unsure. Your brain fills in gaps, and the second pass is more honest than the first.
One earbud quieter than the other
Before you decide a driver is failing, check the three common causes in order:
- Balance. On iPhone it is in Settings → Accessibility → Audio & Visual. On Android it is under Accessibility (Audio adjustment on Samsung, Audio balance on Pixel). On Windows and macOS it is in the sound output settings. Centre it.
- Mono audio. The same menus have a Mono Audio switch. With it on, the left right check will always fail.
- Earwax and lint on the mesh. Wipe the mesh with a dry cotton swab or a soft brush — no liquids into the opening. Then test again.
If one side is still quieter on two different phones or computers, the driver itself is wearing out.
Wired vs Bluetooth vs AirPods
Wired headsets fail at the plug more often than at the driver. Wiggle the jack during a tone. Bluetooth pairs can play “mono-ish” depending on codec and accessibility settings. AirPods need both buds in-ear; one side in the case will fail the left and right check by design. If one AirPod sounds muffled after rain or a workout, dry it before testing — AirPods Water Eject explains why a tone is the wrong fix and how long to wait.
Testing headphones you are about to buy or return
For second-hand or open-box headphones, run Left, Right, Stereo and the full sweep at low volume, then wiggle the cable or move your head. Any crackle, cut-out or one-sided bass is worth raising before you pay — or before the return window closes. For the low end specifically, the Bass Test shows how low they really go.
After the test
If headphones pass and the phone speaker does not, the phone grille is next — not a new headset. Jump to Speaker Test or Speaker Cleaner. If a bud was worn in the rain, dry it before charging; do not blast a wet driver.
Common devices
Wired headphones
Wiggle the plug while a tone plays. Intermittent cuts usually mean a broken strain relief, not the driver.
Bluetooth over-ear
Disable ANC briefly. Strong noise cancelling can make a quiet test tone feel missing.
USB / dongle headsets
Select the USB device as the browser output. The OS speakers will otherwise take the test.
If something sounds wrong
Left and right are swapped
Check that the cable or earbud stems are in the correct ears. Some Bluetooth dongles invert channels — try a wired connection.
Only one earbud plays
For wireless buds, reseat both in the case, then reconnect. If a wired side is dead, the cable or driver may be open-circuit.
Stereo sounds hollow or distant
Spatial audio and “wide stereo” modes can smear the image. Turn them off and re-run the stereo clip.
FAQ
How do I run a left right headphone test?
Play Left, then Right. Each tone plays on one side only. If both play in one ear, the headset may be mono, or one driver is down.
Why is one earbud louder than the other?
Check the balance slider and Mono Audio in the accessibility settings first, then clean the mesh of the quiet bud. If it is still quieter on a second device, the driver is wearing out.
Is a right and left headphone test different from left and right?
No — it is the same check in the other order. Playing Right first is a useful second pass, because it stops you expecting the sound on a particular side.
Does this work with AirPods and Bluetooth headphones?
Yes, as long as the browser output is routed to that device. Some Bluetooth codecs collapse true stereo — a wired retest helps confirm.
Why is the frequency sweep useful?
A driver can pass a midrange beep and still fail on bass or hissy treble. The sweep makes dropouts easier to hear.
Can this tell me if my headphones are “good”?
No. This headphone tester checks that channels play and that a range of tones is audible. It is not a lab measurement of frequency response or distortion.