I need help building speakers for a PA system. I have never built a speaker system before and so it would be really nice if you guys explain things to me simplified and in details. I don't need connection and circuit diagrams because I got a friend who is going to do the wiring. All I need is the box design (measurements) and how many speakers, woofers, tweeters etc I need for a complete range of sound and their placement in the cabinet. I would be outputting vocals and guitar through the speakers and they should be capable of handling that. I don't need to output bass as I already got a bass amp. I am looking for around 500W output. Please help!