The AMP-HD2SIC5 is a (3) Source Integratable amplified ceiling speaker. It includes an electronic shunt to help conform to life safety NFPA72 regulations to be able to shut off from a central locations in the event of an emergency. The new amplifier has 3 sources; 1) one stereo 3.5 mini jack line input, 2) one POP aux input, and 3) one CAT 5 input for connection to the OWI MC4 mixer. (If 25/70/100 volt is required then a transformer will be required and supplied).