I'm looking at installing a PA in a 350-seat auditorium that is 17m wide by 19m deep by 7m high.
I have my eyes on some good mid-fi speakers I believe are 600W, but am unsure how many I need and what amps I should get. Given the speakers are quite directional I'm thinking I will need up to six speakers.
Should I run two sets of three speakers, or three pairs with another two in the center? What amp(s) should I be looking at?
The needs for a public-address sound system, which is what you're setting up, are a lot different than that of a sound system for the home, which is what we're most concerned with. So you're best off consulting with companies that specialize in public-address systems. They should be able to direct you to the right products and help you get it set up properly.