Tough Room,Speaker Placement Challenge

It would help to know your equipment and what problems you've encountered with any configurations you may have already tried. Not knowing these things, I'd suggest the following.

Place the speakers along the bottom of the L (13 feet wide) wall. Speakers approximately 8 feet apart and 2-3 feet from the front wall. They should now be approx. 2.5 feet away from the side walls. Listening position would be in the nearfield, approx. 8 feet away from the speakers. If you have non-carpeted floors, you may need a wool carpet in front of the speakers.

Good Luck,
Dave

Have you ever thought about taking up minature golf? Make a great dog-leg left. And whatever you do don't go to your local audio store (if they are like around here), they will try to install 14 speakers in the walls for you.

In any event, you haven't said where you like to sit and what's in the room. Usually an office imposes certain requirements in this direction. Also I've found that theory is nice in these cases, but nothing is as good as just experimenting. The formuals are very complicated in a room like this full of furniture and speakers have their own needs re distance to resolve the music. Floor and wall coverings might be as important as dimensions. Art Ludwig's site is my fav for browsing on this kind of issue (www.silcom.com/~aludwig) and the Horraum is good too (http://physchem.kfunigraz.ac.at/listeningroom).

Good Luck

Sincerely, I remain