How to use
- 1Choose a mode: Tone, Sweep, Noise or Binaural.
- 2Set the frequency with the slider, number field or presets, and pick a waveform.
- 3Set a low volume first, then press Play (or Space).
- 4Raise the volume slowly; use ½ and ×2 to jump an octave.
Tones and waveforms
Tone mode plays a steady frequency between 20 and 20,000 Hz. The slider is logarithmic, so every octave takes the same space and low frequencies are easy to set; type an exact value (to 0.1 Hz) or use presets such as 50 Hz, 440 Hz (concert A) and 1 kHz. A sine wave is a pure tone; square, sawtooth and triangle waves add harmonics and sound brighter or buzzier. Common uses: testing speakers and subwoofers, finding rattles, checking left/right channels, tuning and simple hearing-range checks.
Frequency sweep and noise
Sweep glides from a start to an end frequency over 1–600 seconds on a logarithmic or linear scale — handy for finding speaker resonances, room modes or the upper limit of your hearing. Noise mode plays white noise (equal energy per frequency), pink noise (equal energy per octave, used for speaker and room measurements) or brown noise (deeper, often used for focus or masking sounds).
Binaural beats
Binaural mode plays a carrier frequency in one ear and a slightly different one in the other; your brain perceives the difference as a slow beat (for example 200 Hz left and 210 Hz right gives a 10 Hz beat). This only works with headphones. Claims about binaural beats changing brain states are not well established, so treat it as an audio experiment.
Protect your hearing and speakers
Start at a low volume and increase it slowly. The output is capped for safety, but your device volume still matters: loud or high-frequency tones can damage hearing and small speakers or tweeters, even if you can barely hear them. Avoid long listening sessions, and be careful with headphones. Very low frequencies may be inaudible on laptop and phone speakers.
Frequently asked questions
What frequency range can humans hear?
Roughly 20 Hz to 20,000 Hz for young people; the upper limit typically drops with age, often to 14–16 kHz or below in adults.
Why can’t I hear very low frequencies?
Small speakers in phones and laptops can’t reproduce deep bass. Use headphones or a subwoofer for frequencies below about 100 Hz.
Do binaural beats work through speakers?
No. Each ear must receive its own frequency, so you need headphones.
Can a tone generator damage my speakers?
Yes, at high volume — especially high frequencies on tweeters and very low frequencies on small drivers. Keep the volume moderate.
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