There are suggested room dimension ratios for minimum mode generation. Will the room be on a concrete slab? If so consider isolating the slab from the rest of the house. I have heard people even isolating the component area and the speakers from the rest of the room. If there is a Wife factor then consider having conduit placed in the floor before you pour your slab for speaker wire or component interconnects. Is this room going to be used for Home Theater too in the future? There is also the question of power. Run the lighting on a separate breaker, dedicated 20 Amp line for each amp, etc, etc. If you are going to have Home Theater then make sure you power running to the places you need it and plenty of it. (For Example, in the ceiling if you are using a projector or to the rear speakers if you go with powered speakers like Meridian or if you amps are in the back) A book I found very useful in the general principals of acoustics is "The Master Handbook of Acoustics." Several people have also recommended (but I have not read) "Sound Studio Construction on a Budget" both by F. Alton Everest. These books should answer most of your questions and instill many new ones. :-) Cheers and Good luck.
Best Listening Room?
I am considering building an addition to my house, and figured I'd build a dedicated listening room while I am at it. So the question is, what is the best listening room one can reasonably build? Should it be square/rectangular or have tapered walls? Round corners? Should the ceiling/roof be high or low? Flat or angled? What is the best floor, wall and ceiling covering material? Etc etc... In other words: If you were to start from scratch, what would be the best room you could build?