Toa SX-2000 Series Manual - Manual (Page 43)

Chapter 4
SX-2000AO AUDIO OUTPUT UNIT
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 24 V emergency cutoff input*
1
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 size*
2 ), and multiple units can be installed in
different locations with no need to centralize in one location.
Two inputs can be mixed and output. The SX-2000AO receives audio signals from the SX-
2000AI or SX-2100AI Audio Input Unit by means of digital transmission in normal operating
condition. However, if no general broadcasts can be made due to system failures, the SX-
2000AO uses an analog transmission path to receive audio signals, enabling all-zone calls to be
made (referred to as "general urgency all-call" in this manual).
The SX-2000AO is equipped with 2 power inputs, allowing the connection of a backup power
supply for use during power failures. Level meters provided for each output channel allow
monitoring of audio output levels. Output volumes can be adjusted using the output volume
controls on the front panel, however the maximum volume when the volume control knob is
rotated fully clockwise is a default value defined by the SX-2000 Setting Software.
Also, any output channel can be monitored using the internal speaker. The key lock function,
designed to prevent accidental mistaken operation, can disable output volume control and
channel key settings.
* 1 The SX-2000AO has a 24 V emergency cutoff input terminal on the rear panel, allowing control
of an emergency audio input. When the SX-2000 system is combined with an emergency
broadcast system, a 24 V DC is normally kept being supplied to this emergency cutoff input
terminal and is cut off (24 V emergency cutoff function) in emergency situations. This interrupts
the general-purpose broadcast from the SX-2000 system, allowing the emergency broadcast
system to override it. (For details, see the separate Installation Manual, "Installation.")
* 2 1U size = 44.5 mm (standard size)