Unrealistic? It's been done in the marching band world for a LONG time very effectively. I know people hate to hear the 'b' word in a drum corps discussion, but implying that it is impossible to set up electronics in a matter of minutes isn't true. I would be more than likely to chalk this up to 'new technology' being used in the drum corps idiom, and it will take time for staff members/designers to learn how to set them up and run amplification effectively.
--
doug (sorry; I accidently posted this from my wife's account)