Although binaural beats are popular tool for brainwave entrainment, they are not the only way. Monaural beats and isochronic tones are also used for entrainment. Let us see what makes them different from each other.
This is the most well known form of brainwave entrainment, where two slightly different frequencies are presented to opposite ears. The brain perceives them as a warbling sound at the difference frequency: these cyclic pulsations are called binaural beats. The two input frequencies should be lower than 1000 Hz and the frequency difference only up to 30 Hz. So the binaural beats are manufactured in the brain and not fed through the ears. Headphone is required for this technology to work.
You may ask, why take all the trouble of feeding two different frequencies to ears and making the brain create binaural beats? Why not send in the readymade beats? This is where monaural beats and isochronic tones outsmart binaural beats and there is no need for headphones.
Monaural beats work similar to binaural beats and combine two sound frequencies to form a pulsating beats. However, they are formed by combining the frequencies digitally or naturally before the sound reaches the ears. They are considerably more effective than binaural beats due to greater amplitude variations compared to binaural beats.
Isochronic tones are evenly spaced well-defined pulses of sound waves. They are created manually by switching on and off the sound source. This is by far most effective of three methods discussed here. People who don’t respond well to binaural beats often do pretty well with isochronic tones. The spacing between the pulses decides the frequency of the tone. Here you have complete control over the amplitude (height) as well as spacing of pulses.
You may try free samples of brainwave entrainment audios at the website Mind Awakening Techniques.