Hey Guys, a friend a mine just recently gave my band a mixer to use on our quest to get a functioning PA system. So we bought a speaker (Kustom KPC215 H 2x15) with another one the way as soon as we get the money. But we got the speaker today and went to test the mixer out, only to realize that it was an unpowered mixer. So can we just buy a power amp to run between the mixer and the speaker? And would we need a power amp for each speaker that we would have, or can we run multiple speakers off one power amp? Sorry for my stupidity, I Just have no experience with PA systems. Thanks!