sorry if in the wrong place, but here goes, i have a bunch of PA Speakers, two 15" yahamma's, and 2 12" stage moniters.. and i also have an SAE 2500 powers amp ( from the 70's ).... its strange, in the back it has like regulular speaker wire out put parts, (red and black ) and the input is the type of input thats like on a playstation video cable , ( you know right? ) so i had bought an adapter to convert a regular guitar cable into that, i hook a regular speaker up with the red black wires, hook a guitar in to test, and it works.... but its not very loud for 300 watts you know? do i need to buy a little mixer ? or what? how do i hook up the regular PA speakers? PS: IM TRYING TO USE THIS AS A PA SYSTEM FOR VOCALS help please..