Monaural Beats
Monaural beats are created by mixing two separate tones externally, producing nearly the same sound as with the binaural beats. The concept behind monaurals is the same with that of binaural beats.
Two different steady tones are introduced to each speaker and the resulting sound is mixed before it reaches the ear. So you get nearly the same result as a binaural beat.
As the produced tone is formed outside the skull, monaurals, like isochronic tones, do not require headphones to work.

There is also a study on monaurals that showed that are 5 times more effective than binaural beats. As you see in the picture, the wave form of a monaural beat has a clearer imprint than a binaural which is more shallow.
Unfortunately, I haven’t test many monaural products in order to compare them with binaurals. Though, there is some brainwave entrainment software, like Neuro Programmer 3, that contain monaural sessions.
Unmasked monoaural beats can be heard more easily than unmasked isochronic tones. Their effect in stimulating the brain is powerful and noticeable.
If binaural beats are considered to be the soft-core of brainwave entrainment then isochronic tones are the hardcore and monaurals are in the middle.
You can check this forum for more information about brainwave entrainment. This is a community site of the Transparent Corporation which develops brainwave entrainment products.
One of these is the Neuro Programmer 2 which is a very good software that contains also monaural sessions. The discussions there are not limited just to the company’s products. You can find reliable and valuable information for many brainwave entrainment products, general discussions in the topic and more.
