Here is a very simple rule that works well for a good tonal balance (for me anyway).
Measure these three dimensions: distance from the side walls, distance from the wall behind speakers and the distance of the center point of the woofers to the floor. Call the dimensions a,b,c where A>B>C, A=biggest, C=smallest. Then set-up the speakers such that B^2 = A*C (B squared = A times C)
Measure these three dimensions: distance from the side walls, distance from the wall behind speakers and the distance of the center point of the woofers to the floor. Call the dimensions a,b,c where A>B>C, A=biggest, C=smallest. Then set-up the speakers such that B^2 = A*C (B squared = A times C)