As far as I know, it isn't that there is a magical brain-wave frequency that is a magic bullet that brings peace, happiness, enlightemenet, riches, growth, etc. Rather, brain activity occurs at multiple frequencies simultaneously with brain activity occuring at different levels and ways all throughout the different parts of the brain.
Symmetrical brain activity at one frequency may not be all that desirable. In fact, some "superhuman" feats of mind are associated not only with heightened activity in certain parts of the brain but also *surpressed* (or very little) activity in others.
Do you want to have very low frequency activity in your brain? If so, why? Maybe you can achieve your desired results by another, more reliable, method.
The people who are making marketing and various claims about brain activity regarding binaural beats are not, by and large, reputable neurologists. And even neurologists really don't know all that much about the brain.
