Did you know there’s interesting technology built around using higher-order harmonics to “fake” people into thinking they are hearing low bass sounds?
This is done because some speakers can’t produce the low frequencies needed for the bass sounds. So taking advantage of human auditory perception, you can generate a certain pattern of higher frequency harmonics. Our brains believe we are hearing the low frequency because we “fill-in” the missing fundamental frequency. Pretty awesome!
Read more about it on Wikipedia!
http://en.wikipedia.org/wiki/Missing_fundamental