If you use a speaker like the Larsen 4 you most probably won't need room treatments. Seriously. Sit them smack against the longest wall, move them apart or closer until the sound image is what you want and pour your favorite beverage.
I used to be a Larsen dealer and I set up Larsen speakers in some of the worst rooms you ever saw. 10x10x7 cube. 14x36x9 "porch" w/ rock front wall and waaay off center. Only one customer needed treatments and that was because of the crappy room construction.
I used to be a Larsen dealer and I set up Larsen speakers in some of the worst rooms you ever saw. 10x10x7 cube. 14x36x9 "porch" w/ rock front wall and waaay off center. Only one customer needed treatments and that was because of the crappy room construction.