Controlled signal
The tool generates the test inside your browser with a bounded app-level gain. Your operating-system and hardware volume remain separate.
Online Headphone Test
This guided headphone check moves from basic channel routing to balance and phase. Confirm what you hear after every signal; the browser cannot inspect the drivers on its own.
Confirm selected signal
The spoken instruction is centered. The tone that follows is the directional test signal. Only your confirmation determines the result.
Local by default
Output tests do not upload audio. Microphone tools request permission only when started and explicitly state what stays in memory.
SCOPE / 01
What this test checks
The test sends known signals to the left, right or both digital channels so you can compare them with the physical earcups. It is most useful for separating a routing or fit problem from a fault that follows the headphones to another device.
- One earcup is silent, quieter or less clear than the other.
- A new headset has weak bass, an off-center stereo image or uncertain channel labels.
- Whether each digital channel reaches the expected physical side.
- Whether a centered signal appears reasonably balanced between both ears.
- Whether reseating the pads or tips changes bass and phase perception.
- Calibrated frequency response, sound pressure or hearing sensitivity.
- A damaged driver without comparing the headphones on another known-good source.
PROCEDURE / 02
How to run this test
Keep the level moderate and change one thing at a time so the result remains useful.
- 01
Set system volume low and put the headphones on the correct ears.
- 02
Play left, right and center signals, confirming where each appears.
- 03
Check a low-frequency tone and compare in-phase with out-of-phase playback.
- 04
Use the result to separate settings, fit, cable and driver faults.
INTERPRETATION / 03
What your result means
Match what you heard or saw, change one variable, then use the linked check to verify the result.
| Observation | Likely cause | Next step | Retest |
|---|---|---|---|
| 01One channel is silent on every test. | An off-center balance setting, incomplete plug connection, damaged cable or failed driver can interrupt one side. | Center the system balance, reseat every connector and compare the same headphones on another source. | Diagnose one silent side |
| 02Both sides play, but the center pulls left or right. | Unequal balance, pad or ear-tip seal, debris, fit or channel sensitivity can shift the image. | Reverse the headphones briefly and check whether the quieter side follows the hardware or stays with the same ear. | Check unbalanced audio |
| 03Bass is weak until the headphones are pressed or reseated. | A poor acoustic seal is allowing low-frequency pressure to escape; this is especially common with earbuds and closed headphones. | Try another tip size or adjust pad position, then repeat at the same moderate volume. | Retest low frequencies |
| 04In-phase and out-of-phase signals sound almost identical. | Mono audio, a channel-combining adapter or unusual spatial processing may be removing the intended stereo relationship. | Disable mono accessibility audio and spatial effects temporarily before comparing again. | Run the phase comparison |
VARIABLES / 04
Why results can vary
The generated signal stays controlled; the physical device, room and system path can still change what reaches you.
Seal and placement
Small changes in ear-tip depth or pad position can alter bass and perceived balance without an electrical fault.
System balance and mono audio
Accessibility controls can attenuate one channel or combine both channels before the signal reaches the headphones.
Cables and adapters
A partially inserted plug or incompatible adapter can lose a channel, combine contacts or change microphone and headphone routing.
Source comparison
A fault that follows the headphones across two known-good sources is stronger evidence of a cable or driver problem.
LIMITS / 05
Browser limits and safety
Online Headphone Test questions
Why is one headphone quieter?
Common causes include an off-center balance control, poor ear-tip seal, debris, a loose connector, Bluetooth behavior or a damaged driver.
Can this test damage headphones?
The site starts at a reduced level, but system and hardware volume remain under your control. Begin low and never use painful levels.
Does the test record audio?
No. Headphone output tests generate signals locally and do not request microphone access.