Frequency Sweep Generator
Play a frequency sweep that glides across a range of pitches.
A tone that glides through frequencies
A frequency sweep is a tone that smoothly rises or falls through a range of frequencies, gliding from one pitch to another. This generates one in your browser, useful for testing audio equipment across its range and demonstrating the frequency spectrum.
Set a range to play a frequency sweep.
What a sweep reveals
A sweep is a powerful test because it exercises an audio system across a whole range of frequencies in one continuous pass, revealing things a single tone cannot. As it glides, you can hear where a speaker or headphone gets quieter, distorts, or drops off entirely, exposing the limits and unevenness of its frequency response. In a room, a sweep reveals resonances and dead spots, where certain frequencies boom or vanish due to how sound interacts with the space. It also demonstrates the audible spectrum vividly, letting you hear the full journey from deep bass rumble to high treble and, at the top, to where it passes beyond your hearing. As always with tone generation, the caution is to start at a moderate volume and be careful, since a sweep passing through high frequencies or resonant points can become loud or piercing, and low frequencies at volume strain speakers. Used sensibly, a sweep is one of the most revealing simple audio tests there is.
Questions & answers
What does a frequency sweep test?
An audio system across its whole range in one pass — revealing where a speaker gets quieter, distorts or drops off, and room resonances where frequencies boom or vanish.
Any safety note?
Start at a moderate volume — a sweep passing through high or resonant frequencies can become loud or piercing, and low frequencies at volume strain speakers.
Is anything uploaded?
No. The sweep is generated in your browser.