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HeadphonesHeadphone Testing Online
Check both headphone drivers, confirm the left and right channels are not swapped, and sweep the full frequency range.
Headphone testing online is best done in a quiet room at moderate volume. Loud sweeps mask exactly the small buzzes and rattles you are trying to hear.
Headphone Testing Online: step by step
- Set the volume to about half
Loud tones mask exactly the rattles and buzzes you are trying to find, and a full-volume sweep at 40 Hz can damage small drivers.
- Play the left channel
The left cell in the panel lights up. You should hear the tone only in your left ear. Nothing, or sound in the wrong ear, is a fault.
- Play the right channel
Same again on the right. If both sides play when only one should, the connection has fallen back to mono — common with a partly inserted 3.5 mm plug.
- Play both channels
A centred tone should appear to sit between your ears. If it pulls to one side, the two drivers are at different output levels.
- Run the frequency sweep
The sweep climbs from 20 Hz to 18 kHz over sixteen seconds. Listen for buzzing at the bottom, dropouts in the middle, and note where the tone disappears at the top.
- Try the individual tones
The tone buttons hold a steady pitch so you can compare ears carefully at a single frequency.
What each symptom means
- Buzzing on low tonesSomething is loose in the earcup, or the driver is damaged from prolonged high volume. Buzzing that changes when you press the cup is mechanical.
- Muffled on one sideEarwax or dust in the mesh. Clean the grille with a dry soft brush before assuming the driver has failed.
- Crackle when moving your headA broken conductor inside the cable near a stress point. Detachable cables can be replaced cheaply; fixed cables mean a repair.
- Channels swappedAlmost always an adapter or extension lead wired in reverse. A four-pole plug pushed into a three-pole socket produces the same effect.
What a channel swap really means
Swapped channels are almost never a fault in the headphones themselves. The usual causes are an extension lead or adapter wired in reverse, a four-pole plug pushed into a three-pole socket, or a balance control that has drifted in system settings.
It matters more than it sounds. Every stereo recording places instruments, voices and effects deliberately across the field, and reversing them scrambles that image. In gaming it is worse still, because directional audio cues point you the wrong way.
Questions people ask
Do I need special headphones?
No. The test works with wired, USB and Bluetooth headphones, earbuds and over-ear models alike.
Why is the bass quieter than expected?
Small drivers roll off below about 50 Hz, and open earbuds lose bass if they do not seal. This is normal, not a defect.
Does this test noise cancelling?
Not directly, but you can run the sweep with cancelling on and off and hear how the response changes.
What is a normal upper hearing limit?
Most people under 25 hear to about 17 kHz, most over 40 to around 14 kHz. Losing the top of the sweep is age, not equipment.
Related tests
Carry on with: why AirPods sound worse on calls, testing AirPods, or testing speakers and mic together.
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