Marshall Leach’s Website
http://users.ece.gatech.edu/~mleach/
There is something here for every audiophile.

His Book (in its fourth printing)
Introduction to Electro-acoustics and Audio Amplifier Design, Third Edition
http://users.ece.gatech.edu/~mleach/audiotext/
If you are a serious advocate of matters acoustic, the read/study will be well worth the effort.
A little math is required, but it is not at the 'daunting' level.

Regards,

WHG