Binaural Beats: How They Work and How to Listen to Them

Binaural beats are among the most popular sounds for meditation, focus and relaxation. The principle is surprising: your brain “hears” a frequency that isn’t actually present in the sound. Here’s how it works, and how to listen to them properly.

How binaural beats work

Each ear is played a pure tone at a slightly different frequency. For example, 200 Hz in the left ear and 210 Hz in the right ear. By combining the two signals, the brain perceives a third rhythm, a pulse at the difference between the two: in this case, 10 Hz.

This phenomenon was described in 1839 by the Prussian physicist Heinrich Wilhelm Dove. It’s a perceptual effect: no device emits the 10 Hz sound; it is “built” by the brain.

Why use them?

The appeal is being able to “perceive” very slow rhythms, such as 4, 7 or 10 Hz, which are too low to be heard directly. These rhythms correspond to the brain waves associated with relaxation (alpha) or deep meditation (theta). The idea is that the brain tends to tune itself to this rhythm, a phenomenon called “entrainment.”

Scientific studies on the subject show mixed results: some observe a slight effect on relaxation or attention, others no clear effect. The experience remains very personal: many people find them pleasant for settling down, while others aren’t sensitive to them.

Common binaural beat examples

• Delta (1 to 4 Hz): used to support deep relaxation in the evening.
• Theta (4 to 8 Hz): used for meditation and visualization.
• Alpha (8 to 12 Hz): used for a state of calm alertness.
• 7.83 Hz: a very popular beat, referencing the Schumann resonance.

How to listen to them properly

1. Headphones or earbuds are essential. Each ear has to receive its own sound. On a speaker, the two frequencies mix in the air and the binaural effect disappears.
2. Keep the volume low, just audible.
3. Settle somewhere quiet, sitting or lying down, eyes closed.
4. Listen for 15 to 30 minutes, letting your attention rest on the sound and your breath.
5. Don’t listen while driving or during any activity that requires alertness.

Binaural beats, isochronic tones and generators: what’s the difference?

Binaural beats require two different sounds, one per ear, and therefore stereo headphones. Isochronic tones are a single sound that switches on and off at a regular rhythm: they work on a speaker.

A sacred frequency generator works differently: it produces a single pure sine wave at the exact frequency you choose. For 7.83 Hz, it doesn’t go through the ear: it emits the signal directly through its coils as a very low-intensity electromagnetic field, in silence. It’s a complementary approach that many people use in the background during their sessions.

In summary

• A binaural beat arises from two slightly different sounds, one in each ear.
• The brain perceives the difference between the two: a slow rhythm that would otherwise be inaudible.
• Headphones are essential, and the volume should stay low.
• Effects vary from person to person: worth trying as a support for relaxation and meditation.

Further reading

• Brain Waves: Delta, Theta, Alpha, Beta and Gamma Explained Simply
• Meditating With Frequencies: The Complete Beginner’s Guide
• 432 Hz vs. 440 Hz: Where the Debate Comes From and How to Test It