Hi. I am starting a blues band which will have a total of 11 performers/musicians in it. I need to build a PA system to play to crowds of 500 to 750, maybe more I hope. I don't really understand the technical terms of this so I need to know what I'll need to build it. How much power for speakers (plan is to use active speakers), do I need DI's, Processors, Crossovers, or any other equipment?