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If you were to introduce two tones of different frequency into each ear, you could create binaural beats. For example, playing a tone with a frequency of 100Hz in one ear and playing a tone with a frequency of 114Hz in the other ear, will force the brain to determine the phase difference between the two wavelengths of each tone. We naturally do this to determine directional information.

As these two tones integrate in our brains, we call it a binaural beat. The resultant beat that we perceive would be 14Hz using this example. If the beat were lower, like say 4Hz, it would sound more like a wave. If the beat were higher like 20Hz, it would sound like a beat.

Binaural beats audio files can only be used with stereo headphones. Speakers cannot be used since the tones would mix in the air and produce more of a monaural beat. Those types of beats are usable in brainwave entrainment (bwe), however if the audio files in meant for binaural beats, that’s how it should be used.

When first listening to these binaurals, you may initially hear a warbling sound until your brain adjusts. If you have a hearing loss in one ear, it does not reduce the effect of binaural beats. It’s not how loud they are, in fact you could actually used them just below what we can naturally hear, and they would still be effective. Commonly, binaurals are masked with noise or music of some kind.

There is a lot of controversy over whether or not binaural beats can be used for brain-wave entrainment. According to Dr. Gerald Oster binaural beats can be used to produce beats from as little as 0.235Hz to as high as 26.25Hz. Oster also concluded that binaural beats would be insufficient for brainwave entrainment because the depth of the beat is only around 3 decibels or 1/10 the volume of a whisper.

Many companies use binaural beats as the basis for their products such as The Monroe Institute (Hemi-Sync), I-Doser, and Centerpointe (Holosync). The beats are usually mixed with noise, music, ambiance, or guided instructions.

There are other methods which are more efficient like isochronic tones, monoraul beats, low-pass filter modulation, cross-feed modulation, pitch modulation and auto pan modulation. Each type of technology has its own limitations and methods. We use a combination of these methods to produce the best results.

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