Audio Frequency Tester
This high-precision signal generator produces high-fidelity waveforms using your browser's Web Audio API. Use it to map your ears' hearing curve or measure the physical vibration frequencies of hardware.
Understanding Audio Frequencies (Hz)
Sound is measured in Hertz (Hz). Humans can typically hear from 20Hz up to 20,000Hz (20kHz). As we age, our ability to hear high-frequency sounds diminishes. This tool allows you to find your own "Upper Frequency Threshold." Most adults find their hearing cut-off is around 14kHz to 17kHz.
Hardware Response & Speaker Quality
Not all speakers are created equal. High-end subwoofers are needed to accurately reproduce sounds below 40Hz. If our 40Hz preset is silent but you can hear 1kHz, your speakers lack the physical surface area to move air at low frequencies. Use the **Sine Wave** for the cleanest hardware fidelity check.
Waveform Types & Their Uses
- Sine: The purest sound with zero harmonics. Best for testing base hearing and speaker purity.
- Square: Rich in odd harmonics. Used in synthesizer design and for testing clipping in amplifiers.
- Sawtooth: Contains all harmonics. Ideal for checking the "full spectrum" coverage of a speaker driver.
- Triangle: A softer version of the square wave, useful for testing mid-range clarity.