30 Hz tone
Deep sub-bass.
Volume first: turn your device down before you press play. Tones start quiet on purpose.
Raise the volume slowly once the sound is playing. Very low tones can damage small speakers and woofers if pushed hard. Stop if you hear rattling, distortion or cone slap.
Hz
Waveform
0 dBFS is the loudest your device can play; every 20 dB lower is a tenth of the amplitude.
Space plays and stops · ↑ ↓ semitone · Shift+↑ ↓ octave
What 30 Hz is used for
Where pipe organs, film effects and electronic kick drums live. A good subwoofer should play it cleanly; a port or panel that rattles here gives itself away fast.
| Period | 33.333 ms |
|---|---|
| Wavelength in air (20 °C) | 11.43 m |
| One octave down / up | 15 Hz / 60 Hz |
The generator above starts at 30 Hz. You can still move the slider to any other frequency, or open the full tone generator.
Questions people ask
Why can't I hear the 30 Hz tone?
Small speakers physically cannot move enough air at 30 Hz. Phones, laptops and most earbuds produce little or nothing this low; you need full-range speakers, good headphones or a subwoofer.
How long is one cycle of 30 Hz?
33.333 milliseconds. In room-temperature air the wavelength is about 11.43 metres.
Keep testing
- Tone generatorSine, square, triangle and sawtooth from 1 Hz to 22 kHz.
- Frequency sweepLogarithmic or linear sweeps over any range and duration.
- Subwoofer testBass tones from 10 Hz, a low sweep and a room-mode calculator.