Overview

This unique Redback PA mixer features six input channels which are user selectable for either balanced mic or line as well as two dedicated line level RCA inputs and a 3.5mm audio jack for portable devices. The unit has six levels of VOX priority on inputs 1- 6 with adjustable VOX sensitivities on each input, and a 24V DC output (limited to 120mA current draw) which becomes live when any triggers are activated or VOX/PTT circuitry becomes active. This model includes a set of Mute contacts which can be connected to the buildings Fire Indicator Board (FIB). When the FIB operates it triggers these contacts, rendering the local PA/BGM system inoperative so the main emergency evacuation system has precedence.

The mixer incorporates an MP3 based message player for playback of Alert/Lockdown, Evacuation/Fire or Chime tones.
The emergency tones once activated, will mute inputs 2 - 8, regardless of their priority settings. Input 1 will override the emergency tones so that it can then be used for emergency paging. With the addition of an A 4660A paging console, paging and activation of the emergency tones can be achieved via the console. Input 1 will still override the emergency tones, but emergency paging from the A 4660A will override input 1.

Box Contents
A 4427B Mixer 8 Channel with MP3 active indicator
24V 1A DC Plugpack
Instruction Booklet
 

Features

• Eight input channels
• Micro SD card message player for audio announcements
• Individual level, bass and treble control on all inputs
• Six levels of VOX priority
• Adjustable VOX sensitivity
• Alert and Evacuation override mode
• 3.5mm music input
• Adjustable input sensitivity on line inputs
• 24V DC battery back up terminals
• In built Alert/Evac/Chime functionality
• Mute function
• 24V DC output
• MP3 active indicator
• LED VU meter
• 10 Year Warranty
• Australian Designed and Manufactured

Specifications

• Output Level:0dBm
• Distortion:0.01%
• Frequency Response:20Hz - 20kHz
• Sensitivity:
• Mic inputs: 3mV balanced
• Line inputs: 100mV-1V
• Output Connectors:
• Line out: 3 pin XLR balanced
• Switched out: Screw terminals
• Input Connectors:
• Inputs: 3 pin XLR balanced or 2 x RCA, 3.5mm stereo jack front panel
• 24V DC power: Screw terminals
• 24V DC Power: 2.1mm DC Jack
• Remote triggers: Screw Terminals
• Controls:
• Power: Standby Switch
• Bass: ±10dB @ 100Hz
• Treble: ±10dB @ 10kHz
• Master: Volume
• Inputs 1-8: Volume
• Indicators:Power on, MP3 error, MP3 active, Signal Present, VU Meter

Current Draw:

• A 4427B Idle current draw: 170mA
• A 4427B current draw (with A 4660A connected): 80mA

General:

• Power Supply: 24V DC
• Dimensions: 482W x 175D x 44H
• Weight: 2.1kg
• Colour: Black
• Data transmission to paging console:
• Data transmission: RS485 proprietary
• Cabling requirements: Cat5e UTP minimum
• Cabling length (without A 4658 booster): 200m max

  *Specifications are subject to change without notice.