Delta to Gamma: Which Binaural Beat Frequency for Sleep, Calm or Focus?

Some evenings your thoughts won’t slow down. Some afternoons they won’t speed up. Binaural beat presets promise a sound for each of those moments, usually with a Greek letter attached. Here is what those letters mean.

A 30-second refresher

A binaural beat happens when each ear hears a slightly different tone, for example 432 Hz on the left and 442 Hz on the right. Your brain perceives a slow pulse at the difference, 10 Hz. That pulse rate is what the preset is named after. Binaural beats need headphones; on speakers, use isochronic tones instead. The full comparison is in binaural beats vs isochronic tones.

The brainwave bands

EEG research groups the brain’s electrical rhythms into bands. Binaural presets borrow the same names, based on the idea of entrainment: that a steady external rhythm may nudge brain activity toward it.

Delta (0.5–4 Hz): winding all the way down

Delta waves dominate deep, dreamless sleep. Delta presets are for the last minutes before sleep, usually over brown noise. In Solbox: Deep Sleep (2 Hz), Soothe & Settle (0.5 Hz) and others.

Theta (4–8 Hz): drifting and daydreaming

Theta activity is linked with drowsiness, daydreaming and meditation. People use theta for wind-down, visualization and loose, creative thinking. In Solbox: Deep Meditation (6 Hz), Creative Flow (5.5 Hz).

Alpha (8–13 Hz): relaxed but awake

Alpha is the classic “eyes closed, calm, awake” rhythm. Alpha presets suit reading, light focus and breaks. In Solbox: Calm Relaxation (10 Hz), Light Focus (12 Hz).

Beta (13–30 Hz): active thinking

Beta is linked with alert, engaged thinking. Beta presets are the usual pick for study and deep work. In Solbox: Deep Focus (18 Hz), Problem Solving (15 Hz).

Gamma (30 Hz and up): short, intense focus

Gamma is the fastest band. 40 Hz in particular has drawn a lot of research interest. People use gamma for short, demanding blocks. In Solbox: Peak Cognition (40 Hz).

Quick picker

Moment	Band	Example preset
Racing thoughts at bedtime	Delta	Deep Sleep, 2 Hz
Winding down after work	Theta	Deep Meditation, 6 Hz
Reading, calm focus	Alpha	Calm Relaxation, 10 Hz
Studying, deep work	Beta	Deep Focus, 18 Hz
A short, hard sprint	Gamma	Peak Cognition, 40 Hz

What the evidence actually says

Honest answer: it’s mixed.

• A 2019 meta-analysis of 22 studies found an overall medium positive effect on memory, attention and anxiety measures, with results depending on frequency and listening time.
• A 2022 study testing 16 Hz beta beats on sustained attention found no consistent benefit.
• A 2023 systematic review of 14 EEG studies found that only five supported the idea that beats shift brainwaves, eight contradicted it, and methods varied widely.

So the band names describe what the beats are designed around, not a guaranteed effect on your brain. Many people still find a steady beat a useful anchor, the same way some people like a metronome.

How to try them fairly

1. Pick one moment, like studying, and one band, like beta.
2. Listen for a full block (25–50 minutes), at a low volume, with headphones.
3. Try the same preset for a few days before judging it.
4. Layer it over a noise color if the pure beat feels thin.

Don’t use beats while driving, and if you have epilepsy or a seizure disorder, talk to your doctor before using rhythmic audio.

In Solbox

Solbox has 27 binaural presets across delta, theta, alpha, beta, gamma and a few special ones like the Schumann Resonance at 7.83 Hz. Each plays over a matching noise, with Low, Normal or High intensity, and switches to isochronic tones automatically when no headphones are connected.