# Online Tone Generator

> Play a sine, square wave or noise at any frequency between 20 and 20,000 Hz. For testing speakers, subwoofers and headphones.

Does the subwoofer rattle at 40 Hz, does a speaker buzz at certain notes, or do you want to know how high you can still hear? Set the frequency and press start. Begin at a low volume.

- Open in browser: https://pockettoolbox.org/en/online-tone-generator
- Tool: [Signal Generator](https://pockettoolbox.org/en/signal-generator)
- Runs entirely in your browser; files and input are never uploaded.

## How it works

1. Choose a waveform, sine for most tests.
2. Set the frequency with the slider or as a number.
3. Start with a low volume and press start.

## FAQ

### Up to what frequency can people hear?

Young people up to about 18,000 to 20,000 Hz, and the limit drops noticeably with age. Many adults hear little above 15,000 Hz.

### What is pink noise good for?

It contains all frequencies with equal energy per octave and sounds balanced to the ear. It is often used to calibrate speakers.

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PocketToolbox (https://pockettoolbox.org/en)