The ear is an extraordinary sensory organ. Two books to introduce how and why you hear:
The Physics and Psychophysics of Music: An Introduction by Juan G. Roederer:
The 2nd edition has much (Year 12) physics and a little bit of anatomy. More into the accoustics than biology. Covers how sounds are generated and heard.
Bases of Hearing Science by John D. Durrant and Jean H. Lovrinic (Paperback - Jan 15, 1995)
A lot of anatomy and a little bit of (Year 12) physics. The biology is thoroughly dissected into what happens to sound after it hits your ears. You will never stick anything in your earhole again once you realise how delicate it is on the other side.
Both books have absolutely nothing about loudspeakers.