Toole's book 'Sound Reproduction' is a must read. This book nails everything you must know on the speaker/room end. Without Toole's knowledge everything else will not make sense.
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I second Dr. Toole's book. You can read some of his papers on the Harman web site: http://www.harman.com/about_harman/technology_leadership.aspx. Click on White Papers.
You might want to look at An Introduction to Digital Audio.
You may not care for the tone, but many of The Audio Critic back issues are available online.