also, I recall from the manual that they suggested a minimum of 8' spread between them. and to have them pulled out at least 2'.
I ran mine 12' apart, 5' out in the room and 2.5' from each side wall. Toed in a lot, maybe 3", so that they were pointing at each shoulder while I sat.
My seat was 13' away.
After keeping this for nearly a year, I moved them in a little to 10' apart. I think I liked that a little better. imaging was a little more stable.