Hi Ziff -- try a rectangular 15W x 25L x 12H. Also, you can check out Cardas' Golden Rule for speaker placement that also refers to rooms. Good luck!
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I wouldn't recommend a rectangle at all. Although that's what is mostly written up--it's done so because acoustic calculations for standing waves are pretty simple, and most rooms are rectangular. If I were building a dedicated listening room there would be no parallel walls or floor to ceiling height.
Robert Harley's book "The Complete Guide To High-End Audio" recommends a formula with the hight being 1 the length of 1.9 and width of 1.7. If I were designing a room I would splay the walls maybe 2' smaller on the wall behind the speakers than the wall behind me. I have thought a big bow wall behind the listening possition as an effective and look cool. For sure the ceiling would slope, even if only a little was possible. I would look at areas for built in base traps. My new Audiogon friend "nicetom" recommended Everest's book "Sound Studio Construction on a Budget" as an excellant reference. I have seen other Everest books talked about here, that might be the best place to start. Good luck and have fun! J.D.
Ziff, I would also recommend Everest Book "The Master Handbook of Acoustics". As far as splaying walls go I think Everest does a Finite Element Analysis on a room with splayed walls in the book. If you are absolutely sure you want to splay the walls do yourself a favor and check local building codes first. In my area the local building codes say the walls must be straight to within a 1/4" over a given linear distance, but I am not sure how this applies to wall coverings like sheetrock. Cheers, Dan