For sensor cells to receive signals, he says, there must be a mechanism for transforming the large, weak
airborne sound waves into smaller but more powerful fluid - borne sound waves that the sensor cells can detect — a process called impedance matching.
HEAR YE, HEAR YE: On the phone or otherwise, the process of hearing usually begins when
airborne sound waves travel through the ear canal and then hit the eardrum, causing it to vibrate.