Guardian CX4 MK3 – Priority Interface & Sound Level Control

The Guardian CX4 MK3 is a priority interface and sound level control, which has a control input for interfacing with any fire alarm.

The unit has two functions, it’s 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).


The Guardian CX4 MK3 has a control input for interfacing with any fire alarm. It features a trigger output that turns the signal of two stereo systems down and introduces a priority signal.

Features include:

  • Priority signal can be either microphone or line level.
  • There are also two stereo level controllers with indications on the front panel.
  • A test and reset switch are accessible through the front panel for quick setting up.


  • Frequency response 20Hz to 20kHz +-0.5db
  • Noise floor <-90db


Additional information

Product Manual

<a href="/wp-content/uploads/2020/08/Formula-Sound-CX-4-Manual.pdf" target="_blank">Download</a>

Product Leaflet

<a href="/wp-content/uploads/2020/08/Formula-Sound-CX-4-Leaflet.pdf" target="_blank">Download </a>


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