GUARDIAN CX4 MKIII
MK2
The Guardian CX4 MKIII performs the same functions as the CX4 mk2 but with added features and options:-
Two independent sound level control circuits (Channels 1&2 and Channels 3&4).
Security loops with adjustable sound level attenuation (Dim).
.
Improved noise limiter section incorporating a slow acting average limiter and a separately adjustable peak
limiter.
Phantom power option for priority input.
Introduction
The Guardian CX4 MKIII has two functions, its first function is to provide a priority input into an audio system of
either 4 mono or 2 stereo channels (Priority Override). The second function is to control the maximum operating
audio sound level in 2 stereo channels (Sound level control).
Priority Override
The Guardian CX4 has been designed to be connected between the mixer (or pre amp) and the power amplifiers of
an audio system. The unit is a 4 channel device usually connected as two stereo pairs.
The CX4 may be used with any sound system where a priority override facility is required e.g. Entertainment venue,
shopping centres, malls, cruise ships or any public area where fire, security or other important announcements are
required.
The priority input may be a microphone or line level source (selectable internally). When the unit is not triggered the
priority input signal is available at the priority output socket. This is so that a microphone which is in normal use (i.e.
DJ, MC, or compère) may also be used as the priority input.
Phantom power may be selected for the priority input if required by setting an internal jumper.
Operation
In normal mode programme signals pass through the 4 audio channels of the CX4 with no change in level. When
the unit is triggered the incoming programme level is attenuated and the priority signal is mixed into the four outputs.
When the unit is reset the priority signal is removed and the programme will fade back to the original volume.
The amount of attenuation and priority level can be adjusted by pre-set controls located under the front panel.
LED indicators of LIMIT, PEAK, DIM and PRIORITY are provided on the front panel to show the status of the unit.
Connectors are provided on the rear panel for remote indicators should they be required.
Balanced inputs and outputs are provided which may be strapped unbalanced with no signal loss.
Control input (trigger)
The control input may be configured for voltage or switch operation. Jumpers located behind the front panel set the
options and are labelled CONTROL SELECT. The position of two jumpers determine Voltage or Switch mode (be
sure to move both jumpers).
Adjacent is a jumper labelled CTRL SENSE. This jumper allows the unit to be controlled in voltage mode by voltage
applied or voltage removed, or in switch mode by normally open (N.O.) or normally closed (N.C.) switch contacts.
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