The P.A. power amplifiers are used for audio systems which connect audio sources and many speakers with 100V costant voltage or with low impedance (2-4-8-Ohm).
They can connect many different sources: microphones, music sources, audio allarms, and automatic audio messages for advertising or security.
Normally they can control one or many zones and allow to send audio signals in one or all the areas at the same time.
They're used in audio systems for the Pubblic Address (P.A. systems) for supermarkets, hospitals, hotels, schools and many otehers professional audio situations. Through the ethernet input they can be controlled from remote sites.