Back story: I have a big space to fill with sound, 11,000 ft^3 or so. I also have a collection of large horns and compression drivers that I would like to use, if possible, for the surround speakers.
They will be active 3 ways. The mid-range horns are the big Altec Mantarays. I have two with a 60x40 dispersion and two with a 90x40 dispersion.
I can provide the time alignment easily enough since these are active. The c2c spacing is going to be less than 1/2 a wavelength but greater than 1/4 wavelength @ 400hz - acceptable?? How do I determine what drivers/alignments will have matching dispersion characteristics? Or to be more specific, I want to mate these horns to a simple sealed cab with a pair of 15" pro drivers. Is comb filtering even audible at 400hz?