Making binaural beats requires nothing more than two sine wave tones at slightly different frequencies, panned to separate ears. The difference between those two frequencies is the beat your brain perceives. For example, a 400 Hz tone in your left ear and a 410 Hz tone in your right ear produces a 10 Hz binaural beat. With free audio software and a basic understanding of frequency selection, you can create custom tracks in under 15 minutes.
How Binaural Beats Work
When your left and right ears receive two tones that are close in frequency but not identical, your brain doesn’t simply hear both tones separately. Instead, a structure deep in your brainstem called the superior olivary complex detects the tiny timing difference between the two signals and generates a perceived pulsing or “beating” at a rate equal to the frequency gap. If the left ear gets 400 Hz and the right gets 407 Hz, your brain perceives a 7 Hz pulse that doesn’t exist in either audio signal alone.
This perceived beat loosely corresponds to natural brainwave frequencies, which is why people use binaural beats for relaxation, focus, or sleep. The idea is that the beat frequency nudges your brain toward a matching electrical rhythm. Whether that effect is robust enough to be clinically meaningful is still debated, but the auditory illusion itself is well-documented and easy to produce.
Choosing Your Frequencies
Every binaural beat track involves two decisions: the carrier frequency (the base tone you actually hear) and the beat frequency (the difference between the two tones). Both matter.
Carrier Frequency
The carrier frequency is the pitch of the tones themselves. Research consistently shows that binaural beats are best perceived when carrier tones sit around 400 to 500 Hz. This range is high enough for your brain to clearly detect the interaural difference, but low enough to avoid harsh or piercing tones. A carrier of 400 Hz is a safe default for any binaural beat project.
Beat Frequency
The beat frequency determines the type of brainwave state you’re targeting. Here are the standard ranges:
- Delta (0.5 to 4 Hz): Deep sleep. A 400 Hz and 402 Hz pair gives a 2 Hz delta beat.
- Theta (4 to 7 Hz): Meditation, light drowsiness. Try 396.5 Hz and 403.5 Hz for a 7 Hz theta beat.
- Alpha (8 to 12 Hz): Calm focus, relaxation. A 400 Hz and 410 Hz pair produces a 10 Hz alpha beat.
- Beta (13 to 30 Hz): Active thinking, concentration. A 400 Hz and 420 Hz pair creates a 20 Hz beta beat.
- Gamma (30 to 80 Hz): High-level processing, alertness. A 380 Hz and 420 Hz pair yields a 40 Hz gamma beat.
Keep the beat frequency below about 30 Hz for the clearest perception. At wider frequency gaps, the two tones start sounding like separate pitches rather than a single fused beat.
Step-by-Step in Audacity
Audacity is free, runs on Windows, Mac, and Linux, and has a built-in tone generator. It’s the simplest way to make binaural beats from scratch. Here’s the full process using a 10 Hz alpha beat as an example.
Step 1: Generate the left channel. Open Audacity and go to Generate > Tone. Set the waveform to Sine, the frequency to 400 Hz, and the amplitude to 0.8. Set the duration to however long you want your track (10 minutes is a good starting point). Click Generate. On the left side of the new track, drag the Pan slider all the way to L.
Step 2: Generate the right channel. Click in the empty gray space below your first track so nothing is selected. Go to Generate > Tone again. Keep the waveform on Sine and amplitude at 0.8, but change the frequency to 410 Hz. Click Generate. On this second track, drag the Pan slider all the way to R.
Step 3: Preview with headphones. Plug in stereo headphones (this is essential, since speakers will mix the channels and destroy the effect) and press Play. You should hear a steady tone with a gentle pulsing rhythm. That pulsing is your 10 Hz binaural beat.
Step 4: Export. Go to File > Export Audio. Choose your format (more on that below) and save. That’s it. You now have a working binaural beat track.
Using Other Software
Any audio tool that can generate sine wave tones and pan them to separate stereo channels will work. Sound Forge has a built-in tone generator. Professional DAWs like Ableton Live, Logic Pro, and FL Studio all include synthesizers that can produce pure sine waves. You would create two tracks, load a basic synth on each, set one to your left frequency and one to your right, then hard-pan them to opposite channels.
There are also dedicated tools like Gnaural, a free binaural beat generator that lets you program frequency sequences that shift over time (for example, starting at alpha and gradually sliding into theta over 20 minutes). This kind of “frequency ramping” is harder to do in Audacity but straightforward in purpose-built software.
Exporting Without Losing the Effect
A common concern is whether compressing your file to MP3 will ruin the binaural beat. In practice, it won’t, as long as you use a high bitrate. MP3 compression removes audio data considered inaudible to the human ear, but it preserves the left-right frequency difference that creates the beat, the overall tone clarity, and the entrainment effect.
Export at 320 kbps for the best MP3 quality. At 256 kbps or above, most listeners won’t notice any difference from an uncompressed WAV file, even on good headphones. If you want to be cautious, or if you plan to do further editing later, save a WAV master copy and export MP3 versions for everyday listening.
Layering With Ambient Sound
Raw sine wave tones can sound clinical and monotonous, especially over long sessions. Many people layer ambient textures on top, like rain sounds, brown noise, or soft music, to make the experience more pleasant.
The key is keeping the binaural tones audible underneath the ambient layer. Set your ambient track’s volume lower than your sine waves, not the other way around. If you bury the tones completely, the entrainment effect weakens.
A more sophisticated approach is to filter your noise layer so that it also contains the same frequency difference between left and right channels. For instance, if you’re creating a 2 Hz delta beat, you can apply a slight frequency offset to the noise in each channel so the brain perceives the same 2 Hz phasing from all sounds in the mix. This reinforces the beat rather than masking it. In Audacity, you can split a stereo noise track into two mono tracks, apply a subtle pitch shift to one, and re-pan them to opposite sides.
Common Mistakes to Avoid
Playing binaural beats through speakers defeats the purpose. The two frequencies must reach each ear independently, which requires headphones or earbuds. Over speakers, the tones mix in the air and you hear a physical acoustic beat rather than the neural phenomenon you’re trying to create.
Using carrier frequencies that are too low (below 200 Hz) or too high (above 1000 Hz) weakens the effect noticeably. Stick to the 400 to 500 Hz range for the strongest perception.
Setting the amplitude too high can cause listener fatigue over long sessions. An amplitude of 0.8 in Audacity (on a 0 to 1 scale) is a comfortable ceiling. You can always turn the volume down on your device.
People with epilepsy or a history of seizures should approach binaural beats with caution. Rhythmic auditory stimulation can, in rare cases, affect seizure thresholds. If you have a seizure disorder, talk with your neurologist before using any form of brainwave entrainment.