Clear-Com SB-704 Encore Switchboard Main StationThe SB 704 is a 2RU four channel switchboard main station with programmable front panel buttons, individual channel short circuit protection, individual channel volume control, a switchboard matrix, and a regulated fail safe power supply. The SB 704 supports up to 55 beltpacks or 10 speaker stations, or 12 headset stations. The 10 x 4 assignment switching matrix allows up to 10 different groups of stations to be assigned to any one of the four