The sound is generated by the vibration of the object, and the object that is making the sound is called the sound source. The sound is just the movement of pressure waves through the air. The pressure wave vibrates the small bones of the inner ear (listening to the small bones). These vibrations are transformed into tiny electronic brain waves, which are the sounds we perceive. The inner ear uses the same principle as the microphone captures the sound wave or the speaker's pronunciation. It is the relationship between the moving mechanical part and the air pressure wave. Naturally, when the pitch of the sound is low, the movement is slow and large enough, we can actually "feel" the barometric wave to vibrate the body.