Hello everyone I have a Federal Signal PA300 It has the built in mic. I seem to can't get it to function, 1 I need a speaker that is compatible, any suggestion, I am not even sure that it is getting power. I wanna get this one working or I may have to get a another one for I am working with an emergency response unit, also might looking for more lights, I am in need of a full stobe light bar probably about 47" in length with switch or control box, Thank You and any help will be greatly appreciated.