20 Hz sits right at the floor of human hearing — the lowest frequency most people can perceive as sound rather than vibration. In brainwave terms, it falls in the beta range, associated with active, analytical thinking and deliberate concentration.

Beta waves between 12 and 30 Hz are the brain's working frequencies. They dominate when you're alert, engaged, and solving problems. A 20 Hz tone is sometimes used by people looking to support focused thinking during study or work, acting as an auditory anchor for sustained concentration.

At this frequency, the tone is extremely deep — more felt in the chest than heard in the ears. Good headphones or a subwoofer are recommended to experience it fully. Use the pad blend to add harmonic warmth above the fundamental and make the listening experience more comfortable.