Why is everybody forgetting about the ceiling shot in that pic..how part of it comes down can make a gigantic difference in sound!
oh yeah this is a headphone message board, not a acoustic board..
Dude I have two helpful hints..
play with them your self and listen what sounds best...move the little ****ers all over the place!
second is learn what are your walls made of, what is inside them, what is behind them, ceiling height, what makes up the ceiling, what is below you, etc etc....
acoustics circle on audio circle AND
www.michaelgreenaudio.com will help you BUT they will have two different ideas for you to try..so try both!