see August Stereophile "Fine Tunes" P.154 by Jonathan Scull. George Cardas' ideas for reducing "slap echo" via asymmetrical wall dimensions; even tunable rooms with a tapered-angle sidewall on rollers (if you're actually building a room, might as well go all-out). Good article.
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?