A headphone test checks four things: that the left and right channels play on the correct sides, that both drivers are equally loud, that sound moves smoothly between your ears, and how much of the high range you can hear. Work through the panels in order; the result card fills in as you answer.
What each check tells you
- Left / right: wrong side means the headphones are on backwards or the channels are swapped. Both sides at once means mono audio is switched on.
- Driver match: if one side is clearly louder, first check the balance setting and clean the earcup mesh (earwax and dust block sound). If it persists, one driver may be failing.
- Imaging: the glide should travel smoothly through the middle. A jump, a hole in the centre or a lean to one side points to mismatched drivers or a fit problem.
- High range: a guide to what you and your headphones reproduce together. It is not a hearing test.
Fix one side quieter or silent
Windows 11
- Open Settings › System › Sound, select your output device, and check the Left channel and Right channel sliders under Output settings are both up.
- Open Settings › Accessibility › Audio and make sure Mono audio is off.
Mac
- Open System Settings › Sound › Output and set the Balance slider to the middle.
- Open System Settings › Accessibility › Audio and turn off Play stereo audio as mono.
iPhone and Android
- iPhone: Settings › Accessibility › Audio & Visual. Turn off Mono Audio and centre the Balance slider.
- Android: look under Settings › Accessibility for Mono audio and the left/right balance slider. The exact menu name varies by phone maker.
Hardware
- Push the plug fully in. A 3.5 mm plug that is half inserted often plays one side only.
- Try a different cable or port. Wiggle the cable gently while a tone plays: crackling or cut-outs point to a damaged cable.
- On speakers, check each speaker's wire is connected at both ends and that the amplifier's balance knob is centred.
Bluetooth headphones
If your headset sounds thin or mono, it may have switched into its hands-free profile for calls, which uses a narrower, mono connection. Close any app using the microphone, then disconnect and reconnect the headphones. Bluetooth also adds delay; measure yours with the latency test.
Common questions
How do I know if my headphones are working properly?
Both sides should play only their own channel, sound equally loud in the driver match, and the glide should move smoothly through the centre.
Why is one earbud quieter?
Most often a blocked mesh, a balance setting or a poor fit. Clean the mesh gently, check the balance slider, and try a different ear tip size.
Is this a hearing test?
No. The high tones show what you and your headphones reproduce together. For your hearing, see an audiologist.
Do these tests work with AirPods and other earbuds?
Yes. Any headphones your device can play through will work. Turn off spatial audio or head tracking first, because they move the sound on purpose.
Last reviewed 14 November 2026 by Sri Murugan Systems. Found a mistake? Tell us.