About the 432 Hz tone
432 Hz is an alternative tuning for A4, about a third of a semitone below the standard 440 Hz. Many people like its slightly darker sound. Claims that it's especially natural or healing aren't supported by good evidence: see 432 Hz vs 440 Hz.
A 432 Hz sine wave completes 432 cycles every second; each cycle lasts 2.315 ms, and the sound wave is about 79.4 cm long in air. The nearest musical note is A4.
Start with the volume low and raise it slowly. Use the slider to move away from 432 Hz, or try another preset: 20 Hz · 40 Hz · 50 Hz · 60 Hz · 100 Hz · 256 Hz · 440 Hz · 528 Hz · 1,000 Hz · 8,000 Hz · 15,000 Hz · 17,400 Hz · 20,000 Hz.
Questions
How do I play a 432 Hz tone?
Press Play above. The generator starts at exactly 432 Hz as a pure sine wave; you can change the wave shape and volume.
Why can't I hear 432 Hz?
Your speakers or headphones may not reproduce it, the volume may be too low, or it may be outside your hearing range. Very low and very high tones are the hardest.
Is it safe to listen to test tones?
At a comfortable volume, yes. Start quiet, and stop if anything feels uncomfortable.
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