Superb. But, how and why differential waveforms are formed. The the same low frequent waves are procured in both ears? Moreover, humans do not got notice sound waves less than 20Hz, but in case of this video, we are made to hear less than 20Hz, How come?
The "tone" you're hearing is 100 Hz. It will start to disappear below 20 Hz.
The "beat" can go all the way below 1Hz and you can still hear it.
Vivek Gupta