Hands down, the most "bang for your buck" book on this list. It covers all the facets of acoustics in easy to understand terms. Some technical and mathematical concepts are discussed in detail, but all in all this a great reference for people looking to better understand room acoustics.
With the advances in digital technology, musicians can now produce their own music at home. Over the years the gear has gotten much better, and musicians have learned a great deal about recording. So why do so many musicians and engineers have difficulty getting truly professional-sounding results? One reason? Acoustics. If the room you're working in has poor acoustics, it will be extremely difficult -- if not impossible -- to produce excellent results.
Besides covering acoustics in very readable detail, this book is geared towards the do-it-yourselfers. Example studio equipment setups are given for various budgets and there are literally hundreds of great Internet references. This book should be within reaching distance in your studio at all times!
Almost everyone that works for Auralex is required to read the Control Room acoustics sections of this book. Mr. Newell's discussions of "Hidley" rooms and neutral Control Room acoustics are fantastic. Also, this book is a great resource for amateur (and professional) studio loudspeaker builders.
This book goes into a lot of detail on how the "Project" studio is currently being redefined. Lots of informative discussions on acoustics, cabling, pro vs. consumer equipment, etc. It seems like anything Mr. Newell writes is destined to be a classic!
With this book, we're really getting into the "heavies." Definitely not for the "mathematically challenged." However, if you are a systems designer, installer or work quite a bit with different (large and small) room/loudspeaker interface problems, this book is your bible.
Again, this book is definitely more technical, more "textbook." At a whopping 1,553 pages, it is definitely not "light" reading. With contributions from many audio industry experts (including former Auralex Chief Engineer, Jeff Szymanski), this is the book to read to understand everything about everything in the audio world.