500W powered amplifier for announcements and background music with selectable 2 or 4 tone integrated pre-announcement ringtone. 4 XLR balanced microphone inputs with Phantom power supply and gain control. 4 RCA input lines. Mic1-4 priority selector over the other inputs. XLR balanced MIX OUT output line for a mixer with extra power. RCA REC stereo output for recording. PRE output and AMP input for additional signal processors. Individual volume control for Mic1-4 and Aux, overall treble/bass control and Master volume control. Output: 100V, 70V and 4-16 ½ 3U 19″ rack mount. Power supply: 230V/50Hz and 24VDC.