How to use this tool
- 1Tap 'Left' then 'Right' to check each channel in isolation.
- 2Confirm sound comes from the correct side (great for headphones).
- 3Adjust the tone frequency to test bass and treble.
- 4Use the '20 Hz → 20 kHz sweep' to hear the whole audible range.
- 5Listen for crackling, dropouts or distortion at any frequency.
About this test
This test plays pure tones on each audio channel. Isolating left and right helps you find a mute speaker or headphones with a dead side. The frequency sweep runs from deep bass (20 Hz) to high treble (20 kHz).
Blown speakers usually distort at low frequencies and high volume; missing treble may indicate dirt buildup or wear. If one side is silent, also check Android's audio balance settings.
Privacy: this tool runs entirely in your browser. No image, audio or device data is recorded or sent to any server.
Frequently asked questions
Can I test headphones with this too?
Yes. Connect wired or Bluetooth headphones and test each channel to confirm both sides work and are on the correct side.
I can't hear the highest tones, is that a defect?
Not necessarily. Human hearing loses sensitivity above 15-17 kHz with age, so not hearing the end of the sweep is normal.