The AMP HDTR6 is a 3 Source Integratable amplified ceiling speaker with a transformer 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