Check out Roger D'Arcy's nice book titled RA: The Recording Architecture Book of Studio Design. Tons of great ideas with photos and diagrams of various layouts.
How to find a designer for a listening room?
I'm planning to expand a room in my home devoted to audiophile listening and maybe home theater. I have an architect but am looking for an acoustic engineer or specialist to work with my architect to design for great acoustics. Any suggestions? I'm located in the San Francisco Bay Area. Thanks.