New Stereo Sound Book
It is harder to solve audio problems when you don't know the vocabulary and fundamental concepts. This excellent second edition uses F. Alton Everest's lucid sketches to illustrate all the important points. It is that rare technical book that never talks down to the reader, covers all the bases, and does not require a technical background.
Audio Engineering Associate Ron Streicher and co-author, F. Alton Everest tell the real story behind stereo separation.
This tell all book is an interesting read for the layman as well as an excellent technical reference and how-to book for stereo recording.