Pro2 PRO 1323 4- Source 4-Zone Stereo Audio Power Amplifier With a diverse range of inputs including digital optical or coaxial and dynamic microphone inputs and the ability to adjust each zones volume independently the PRO1323 is a quick and easy way of adding audio in up to four rooms. It also features a Loop-out for expanding to another unit increasing the number of zones further Key Specifications Four-in and five-out - IN 1x Digital Optical / Coaxial selectable 1x RCA Stereo 1x 3.5mm Stereo 1x Dynamic Microphone input - OUT 4 Speaker output 1 Headphone output Built-In audio digital to analogue converter DAC Audio DAC Lock indicator Independent microphone level control Individual speaker volume control Provides line loop-out for expanding to more zones Large detachable terminal block supplied for quick and easy installation Screw terminals handle wire sizes from 24 to 12 gauge Speaker Audio Power Amplifier x4 Specifications Amplifier Type Stereo Class-D Output power 15WRMS per channel RL4 ohm THDN 0.06 RL8 ohm f 1 k - Hz Minimum Load Resistance 4 ohm Includes Speaker Protection circuit. Earphone Audio Power Amplifier Specifications Output power105m - WRMS per channel THDN 0.05 RL16 ohm f 1 k - Hz Minimum Load Resistance 16 ohm General Specifications Power Consumed 9A Max Power Source DC 12 Volts Size LxWxH 285mm x 128mm x 43mm Net Weight Unit only 0.8 Kg