The SX-2000AO is an audio output unit for use with the SX-2000 system. It is equipped with 8 audio outputs, 8 control inputs, and 8 control outputs. In addition, one each of the SX-2000CI control input unit and SX-2000CO control output unit can be cascade-connected to the SX-2000AO, allowing the number of SX-2000 system's control inputs and outputs to be increased. The SX-2000AO also features an emergency audio input and a 24V emergency cutoff inputx1 which permits the SX-2000AO to be used in conjunction with an emergency broadcast system. It can be mounted in an EIA equipment rack (2U sizex2) and multiple units can be installed in different locations with no need to centralize in one location.