room size question.

@bshaw 

My room is also 12x12 but one size doesn’t fit all due the characteristics of the speaker so experimentation is key. In my situation, the front center of the speakers are 44” from the front wall and 36” from the side walls. So my speakers are approximately 6’ from each other and my sitting position. This resulted in a large soundstage both side to side and front to back. Just as important is the toe-in. Too much and you lose some of the soundstage and too little you lose some of the center imaging. 
 

Best wishes experimenting.

I agree with grisly by unplugging the subs first. It doesn’t matter whether you measure from the front or back but how it sounds to you. I would try using a good acoustic recording with a single voice. Experiment by moving the speakers forward and then back to see what sounds best. For example, move them say 6” forward and decide what sounds better. Then try somewhere in between until it sounds right to you. Then do the same side to side to possibly form an equilateral triangle from your sitting position. Lastly experiment with toe-in. Start with large increments, then small. 

Remember to take your time and it may take a several tries. If you become frustrated, stop and try later or another day.