Go to the Audio Asylum webb site and look up FAQ's and search under speaker placement. You will find three differe formulas that will aid you in your quest.
Speaker and Placement
I just got a pair of Nautilus 803s and its definetly different from my old Martin Logan Aerius i, I had the Aerius i placed almost perfectly, but the placement for the 803s seem to be different. I have a 19x13 room with the speakers against the short wall, how would you recommend me place them? Is there an formula for placement besides the gold ratio, because with that, my speakers are only 5.8 ft apart and the sound stage is too narrow. Thanks