PA System For Schools That Will Also Announce Pre-Recorded Messages If you are a K-12 school in the USA you will need PA speakers to address classrooms, faculty and office staff. Without a comprehensive PA system it may be difficult for the management to manage affairs of the school so you seek PA system for schools that are updated and comprehensively designed to meet the demands of the institution. We no more see the horn speakers that produce high pitch sounds which is not comfortable to all ears but the modern speakers come with SIP capability and produce crystal clear audio that is easy to comprehend.