The tympanic membrane is 13 times larger than the stapes footplate in humans.

Evidence

In humans, the area of the tympanic membrane (A1) is approximately 13 times larger than the area of the stapes footplate (A2), and the malleus is approximately 1.3 times the length of the incus. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 537

Categorization

• DEFINE: A1 and A2 symbol conventions anchor the impedance-transformation math that follows.