Axiom Home Page Forums General Discussion The Water Cooler Ranked: Factors that matter in sound reproduction

So would it be best to calculate your main viewing/listening position first then work backwards to speaker placement? Based on a 120" diagonal screen it looks like the viewing position would be roughly 12 ft at 1.15x but for a 16x9 120" screen the calculation for best viewing is 15 feet. I guess my question would be would everyone with similar sized screen have the same viewing/listening position regardless of room length/width? Or do you have to account for the room size first?