This is a no brainer.
This is a MUST read by anyone interested in Audio:
Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms by Dr. Floyd Toole
Amazon sell it.
This is also a good read on Multi-Channel Audio:
Surround Sound, Second Edition: Up and Running by Thomlinson Holman
Amazon sell it too, I think...
Speed