You may have noticed that I really hate the idea of trying to increase output by doubling MI type boxes. So I did some modeling to get used to the G.P.A program. In my mind, the comb filtering that results is just not acceptable, not due to the narrow spikes at high frequency, but due to the wider big hit some frequencies in the middle of the vocal range take.
Here are my results for both 2 60 degree boxes per side, and for 2 90 degree boxes per side, set up spaced the way many bands would set them up, based on information from their GC salesman.
60 degree
90 degree
Here are my results for both 2 60 degree boxes per side, and for 2 90 degree boxes per side, set up spaced the way many bands would set them up, based on information from their GC salesman.
60 degree
90 degree