Seems like a cheaper way to do this would be to use only one sound system and insert a flanger on the mix bus.
At least, that is what this rig sounded like as I walked sideways from FOH.
Simply looks like a 1970's concert rig setup when no gave a dam about the comb filter issue
for the most part and piled tons (and I do mean tons) of horn loaded boxes next to each other on each side of the stage. What I dont understand is why the guy just dosnt use the line array and put the subs clustered in the center of the stage and save himself alot of gas hauling with all those other cabs. I am assuming this is one side of the stage. Ya know there is alot of people with no clue out there and not just in the audio world