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).

Product Features

• 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.

Product Specifications

• Connectors: Audio inputs and outputs 3-pin XLR.Priority control input and remote indicators output 6 way screw-terminal connector.
• Visual indicators: Power, limit warning, peak warning, priority override. Parallel remote output will drive solid state relays for external sign switching.
• Audio path: Unity gain, 20Hz-30kHz ±0.5dB.
• Distortion: <0.015% THD at 1kHz +20dBu.
• Input impedance: >30k ohms, max. input level +22dBu.
• Output impedance: 100 ohms, max. output before clipping +22dBu into 600 ohms.
• Control input: 15-24V DC applied to or from trigger (voltage mode), Isolated switch contacts, NO or NC (switch mode)
• Noise Limiter: Level sense taken from channels 1 and 2.Limit threshold adjustable from –20dBu to +22dBu.
• Attenuation: Adjustable override, 0 to -60dB on ch 1+2, 3+4. Adjustable dim, 0 to -11dB on ch 1+2, 3+4.
• Power: 110-115V or 200-240V AC (switchable), IEC connector.
• Dimensions: 1U 19 inch rack mounting x 206mm deep.