In the large scale pro-audio format that I deal with arrays consist of a number of boxes, usually eight cabinets per stack, running from 12 to 16 feet total height. You can achieve a very high degree of directional control in the vertical plane based on the way the cabinets are splayed. What is paramount is achieving a balanced SPL in the audience, and this can be accomplished quite well even with throws on the order of 300 to 400 feet. One of the the best sources to see what can be accomplished is the EAW site, where you can download for free the program that they use for setting up their arrays in various size and shape venues.
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