How to Test Your Headphones
- Put the headphones on with your system volume low, then raise it.
- Left and right: each tone must sound only in that ear; Centre should sound in the middle of your head.
- Polarity: compare In phase with Out of phase. In phase should sound focused and fuller.
- Frequency range: play the sub-bass, bass and high tones, then the full sweep from 20 Hz to 20 kHz.
Understanding the Phase Test
Each headphone driver moves in and out to create sound. If both move together, the sound is in phase and your brain places it in the centre of your head with full bass.
The out-of-phase test deliberately flips the right channel. The two sides now push against each other, so the sound becomes vague, seems to come from all around, and loses bass. If your headphones sound like that on the in-phase test, one driver is wired with reversed polarity — a manufacturing or repair fault.
Frequency Range and Your Hearing
| Range | Example | What to listen for |
|---|---|---|
| 20–60 Hz (sub-bass) | Rumble, kick drum body | Felt as much as heard; small earbuds may barely play it |
| 60–250 Hz (bass) | Bass guitar, male voice | Should be clear and undistorted |
| 2–6 kHz (presence) | Clarity of speech | The ear is most sensitive here |
| 10–20 kHz (air) | Cymbals, sparkle | Fades with age; many adults stop hearing it around 15 kHz |
During the sweep, note where the tone appears and where it disappears. The upper limit tells you as much about your hearing as about your headphones.
Common Headphone Problems
Sound Only on One Side
Push the plug fully into the jack — a half-inserted 3.5 mm plug plays only one side. If it still happens, the cable or connector is damaged. For Bluetooth, re-pair the headphones.
Left and Right Swapped
Check the L/R markings. If you’re wearing them correctly and sides are still swapped, check audio software for a swapped-channel setting.
Muffled or Weak Bass
A poor seal is the most common cause. Try different ear tips on earbuds or adjust the headband. Also check for an equaliser that reduces bass.
Crackling
Crackling when you move the cable means a broken wire inside. Crackling only over Bluetooth usually means interference or distance from the device.
Testing Speakers?
For desktop or laptop speakers, use the speaker test — it checks channels and bass without the headphone-specific tests.
Frequently Asked Questions
How Do I Know Which Side Is Left?
Headphones are usually marked L and R on the headband or ear cups. Play the left ear test — it should sound only in the ear marked L. If it plays on the right, you're wearing them the wrong way round or the channels are swapped.
What Does the Phase Test Tell Me?
In-phase sound appears focused in the centre of your head. The out-of-phase version should sound wider, harder to locate, and thinner in the bass. If the in-phase version sounds like that instead, one driver is wired backwards.
Why Can't I Hear the 30 Hz or 12 kHz Tones?
Many earbuds and budget headphones roll off below about 40 Hz, and high-frequency hearing declines with age — most adults can't hear much above 15–17 kHz. Neither is necessarily a fault.
Why Is One Side Quieter?
Check the system balance setting, clean the earbud mesh (earwax blocks sound), and wiggle the cable near the plug. A crackle or cut-out while moving the cable means a damaged wire.
Can I Damage My Hearing with This Test?
Not at a sensible volume. Start low and raise the volume gradually; pure tones can sound louder than music at the same setting. Never use maximum volume for test tones.
Related Tests
- Microphone TestCheck that your microphone works, see how loud it is, and hear exactly how you sound.
- Speaker TestCheck that both speakers work, are connected the right way round, and can play bass and treble.
- Webcam TestCheck that your camera works and see the resolution and frame rate it actually delivers.
Last updated · Part of our audio & video tests.