Press Play for a quiet 10,000 Hz tone, then step this high frequency generator up to 20,000 Hz.
High Frequency Sound Generator: 10,000 Hz sine tone
Start with your device volume low.
Sine wave · both channels
Hz
Period 0.1 ms
Wavelength 3.43 cm (1.35 in)
8 cents above D#9
Ready. It starts quiet and fades in over half a second.
A steady tone can harm ears and speakers before it sounds loud. Hear nothing? Do not turn it up to find the tone: small speakers cannot play very low tones, and many adults cannot hear very high ones.
Percent of this tool's loudest. Your device volume does the rest.
This high frequency sound generator plays steady sine tones from 8,000 Hz to 20,000 Hz in your browser. It is a signal for tweeters, headphones and recordings: it makes the tone and judges nothing.
Read the full guide
A high pitch tone generator, one step at a time
Press Play: 10,000 Hz fades in at 10 percent volume. Press 8,000 Hz, the lowest tone here, set a quiet level, at half the slider or under, and leave the volume there. Then press the rows upward. The four rows under One side at a time play the left or the right speaker alone, to hear that each tweeter works.
When a row is silent
Above 14,000 Hz the tool itself says not to turn it up. A silent row may be the speaker or the listener, and the page cannot tell which.
A jump of an octave or more, such as 8,000 to 16,000 Hz, fades the tone in again.
Save WAV writes about 30 seconds of the tone on screen, at the volume slider's level.
Questions and answers
Is this an ultra high frequency sound generator?
It reaches 20,000 Hz and stops. The rows from 16,000 Hz up are as high as it goes: there is no 22, 25 or 40 kHz, and nothing ultrasonic.
Why is this high frequency tone generator silent at the top?
Either the speaker is not playing the tone or you are not hearing it, and the page cannot tell which. How high a speaker plays and how high a person hears both vary a great deal. It is a test signal, not a hearing test.
Is there a high frequency generator app?
This is a web page, not an app: nothing is installed, and it runs in a phone's browser.
Can I type a frequency between the rows?
Yes. The big number takes any value up to 20,000 Hz, to two decimal places, and the minus and plus beside it step it by one hertz. A typed value takes effect as you type it.
All 14 tones
Step by step to 20,000 Hz 10
8,000 Hz, the lowest tone hereWell inside a tweeter's usual 2,000 to 20,000 Hz. Use it to set a quiet, comfortable level, then leave the volume alone for every row after it.
10,000 Hz, the opening toneThe tone Play starts with. One wave is 3.43 cm (1.35 in) long. A speaker sends tones this high out in a narrower beam than low ones, so the level changes as you move off to one side.
12,000 HzStill under the 15,000 Hz that older cone tweeters seldom went beyond, so it is within reach of that older kind as well as of today's dome tweeters.
14,000 Hz, the last row before the cautionAbove this tone the line under the volume slider changes: many adults cannot hear this high, and it says not to turn the volume up to find the tone. That holds for every row from 15,000 Hz up.
15,000 Hz, the cone tweeter limitAbout as high as cone tweeters usually reach. Most other tweeters are designed to go on to 20,000 Hz. The page cannot tell a quiet speaker from a quiet ear: silence from here up has both explanations.
Show all 14 tones (9 more)
Step by step to 20,000 Hz, continued
16,000 Hz, the highest octave bandThe center of the top octave band in the standard series. How high a person hears varies a great deal from one listener to the next, most of all up here.
17,000 Hz, a semitone at a timeThe numbers now jump by a thousand, but each of the four steps from 16,000 to 20,000 Hz is only about one semitone: 105, 99, 94 and 89 cents.
18,000 HzNine tenths of the way to the ceiling. A tone missing at this row may be missing at the speaker, on the way through the air or at the ear, and no row on this page can say which.
19,000 Hz, under the sampling limitSampled sound carries tones up to half its sample rate: 22,050 Hz at 44,100 samples a second, 24,000 Hz at 48,000. At either rate this tone fits with room to spare, so the sample rate is not what stops it.
20,000 Hz, as high as the tool goesThe highest tone the tool plays and the upper limit usually given for human hearing. Most tweeters are designed to reach it. There is no 22, 25 or 40 kHz on this page.
One side at a time 4
10,000 Hz on the left sideThe left channel plays and the right is silent. A whistle from the left speaker alone shows that it plays this high; in a speaker with a tweeter, that is the tweeter working.
10,000 Hz on the right sideThe same tone from the right speaker alone. On loudspeakers, a side that plays music but gives nothing here, while the other side whistles, points to a fault in its tweeter or the part that feeds it.
15,000 Hz on the left sideThe harder check for the left tweeter, and under the tool's caution: if you hear nothing on either side, the row tells you nothing about the speakers.
15,000 Hz on the right sideThe right-hand twin. On loudspeakers, where both ears hear both sides, a tone heard from one speaker and not from the other points at the silent speaker.
How this list was compiled: Presets written for this page. Each one is a steady sine tone at a set frequency, on both sides or on one, made in the visitor's browser by this page's own tone generator, which plays nothing above 20,000 Hz and shows its own caution above 14,000 Hz. Checked on 2026-10-02 against Wikipedia: https://en.wikipedia.org/wiki/Tweeter (a tweeter typically covers 2,000 to 20,000 Hz; most are designed to reach 20 kHz; cone tweeters rarely go above 15 kHz); https://en.wikipedia.org/wiki/Loudspeaker (a speaker's sound pattern is nearly even in all directions at low frequencies and narrows at high ones); https://en.wikipedia.org/wiki/Hearing_range and https://en.wikipedia.org/wiki/Audio_frequency (the range of human hearing is usually put at 20 to 20,000 Hz, with wide differences between people, most of all at high frequencies); https://en.wikipedia.org/wiki/Octave_band (16 kHz is the highest nominal octave band center of the standard series); https://en.wikipedia.org/wiki/Nyquist_frequency (sampled sound carries frequencies up to half its sample rate); https://en.wikipedia.org/wiki/Speed_of_sound (about 343 m/s in air at 20 °C). Wikipedia's text is under CC BY-SA 4.0; the facts were checked there and the wording is this site's own. Computed, not looked up: wavelengths (343 m/s divided by the frequency), half of 44,100 and of 48,000 samples a second, and the size of the steps from 16,000 to 20,000 Hz in cents (1,200 times the base-2 logarithm of the frequency ratio: 105, 99, 94 and 89). The list states no age, no loudness in decibels and nothing about animals. Licence: own work