Generate a test tone
Enter a whole-number frequency from 20 to 20,000 Hz. Sine is the simplest waveform and a useful starting point. Square, triangle and sawtooth waves contain additional harmonics and can sound sharper at the same level. Start low and stop if the sound is uncomfortable.
The 165 Hz, 440 Hz, 1 kHz and 10 kHz buttons fill in the frequency; they do not start playback. Changing frequency or waveform stops the current tone so you can make a deliberate choice before playing again.
What are the presets for?
- 165 Hz: a low tone; not a universal speaker resonance or a guarantee of water removal.
- 440 Hz: the commonly used A4 musical reference pitch.
- 1 kHz: a mid-range test tone for a basic listening check.
- 10 kHz: a high tone. Audibility depends on your hearing, device and output settings.
Silence does not always mean damage
Small speakers may not reproduce very low frequencies well. High tones may also be difficult or impossible to hear. Do not keep raising the level to chase an inaudible tone. A browser signal is not a calibrated sound-pressure measurement or a hearing test.
Choose the right tool
For channel routing, use the speaker test. For a timed low-frequency sweep, use water eject. If you are trying to clean a speaker, read the dust cleaning guide before experimenting with tones.