The driver moves back and forth uniformly. It does not vibrate between two fixed points the way a guitar string or the spruce top of a cello does. Since the driver does not distort, it pushes and pulls air uniformly over the radiating surface so it doesn't matter to the air whether the driver is paper, aluminum, kevlar or any other material. The driver recreates the same pressure wave pattern as the vibrating top of the cello.
Sound waves are exactly what we hear for the waves are rarified and compressed air causing the eardrum to vibrate exactly like the source generating the wave.
Sound waves are exactly what we hear for the waves are rarified and compressed air causing the eardrum to vibrate exactly like the source generating the wave.