About the 15 kHz tone
15,000 Hz is a frequency that many adults can still hear but many older adults can't, as high-frequency hearing naturally fades with age. If it's silent to you, try the hearing test to find your exact limit.
A 15,000 Hz sine wave completes 15,000 cycles every second; each cycle lasts 0.067 ms, and the sound wave is about 2.3 cm long in air.
Start with the volume low and raise it slowly. Use the slider to move away from 15,000 Hz, or try another preset: 20 Hz · 40 Hz · 50 Hz · 60 Hz · 100 Hz · 256 Hz · 432 Hz · 440 Hz · 528 Hz · 1,000 Hz · 8,000 Hz · 17,400 Hz · 20,000 Hz.
Questions
How do I play a 15,000 Hz tone?
Press Play above. The generator starts at exactly 15,000 Hz as a pure sine wave; you can change the wave shape and volume.
Why can't I hear 15,000 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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