20 Hz Tone Generator

The Threshold of Hearing: 20 Hz

20 Hz is widely considered the lower limit of human hearing. While young people with healthy hearing can hear this frequency, it is often felt as much as it is heard, manifesting as a physical sensation or vibration.

Understanding Low Frequencies

Sound waves at 20 Hz are extremely long (about 17 meters or 56 feet). Reproducing this frequency requires large speakers or subwoofers capable of moving significant amounts of air. Frequencies below this are known as infrasound.

Uses for 20 Hz

• Subwoofer Testing: Use this tone to test the low-end extension and capability of your subwoofer or sound system.
• System Calibration: Audio engineers use 20 Hz to check for system noise, rattles, and the integrity of a room's acoustic treatment.
• Sensory Experience: Experience the physical sensation of sound. Be careful with volume levels, as low frequencies can carry a lot of energy even if they don't sound loud.

Test your audio gear's limits with this deep, rumbling 20 Hz tone.