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Redback® A 4420C 8 Channel Public Address Mixer
1.0 INTRODUCTION
This 8 channel mixer incorporates a variety of practical features ensuring suitability for a wide scope of PA and sound re-
inforcement applications. Features include: selectable phantom power for electret/condenser type microphones on all mic
inputs, optional VOX muting of AUX inputs, bass and treble controls (microphone channels can be routed through tone
controls or bypassed as desired), individual level controls together with master level control. A 600Ω/0dBm XLR balanced
line output is provided, enabling connection to a maximum of 16 power amplifiers.
2.0 FEATURES
• 6 microphone and 2 line inputs
• All mic inputs are 3 pin XLR balanced
• Line inputs via twin RCA sockets
• Phantom Powering (12V DC) available for all microphone inputs (DIP switch selectable ON or OFF for all inputs
simultaneously) This function is factory set to "OFF"
• Optional VOX (Voice activated) muting of the auxiliary music inputs (DIP switch selectable) when any of the microphone
inputs are used. This function is factory set "OFF"
• The microphones have a Bass cut switch to reduce feedback and improve vocal clarity (DIP switch selectable). This func-
tion is factory set to "Bass Cut"
• Bass and Treble Controls for the Auxiliary inputs
• The microphone inputs can be selected to either channel through, or bypass the tone controls (DIP switch selectable).
This is factory set in the "BYPASS" position
• Supplied with Industry standard 3 pin XLR connectors for microphone inputs and stereo RCA's for Auxiliary inputs.
• The output of the mixer has been designed to operate with power amplifiers equipped with a balanced input . If you
wish to drive an unbalanced amplifier, then simply connect one of the output signal lines of the mixer to Earth, and use
the other output (see figure 3)
• Individual input and master volume controls
• 24VDC input
• 10 Year Warranty
• Australian Designed and Manufactured
3.0 INSTRUCTIONS FOR USE
1. Prior to installation, set the DIP switches to the desired settings (see section 4.0).
2. Plug in a low impedance microphone into the microphone input (refer to fig 2), or a music source (Compact Disc or
similar) into the auxiliary input.
For best performance when using long lines between microphones and the mixer use balanced lines. These have the
effect of cancelling out any noise or hum that may be induced into the cables.
(Note that a balanced line uses three wires (two signal wires and one earth wire or shield) where an unbalanced cable
uses only one signal wire and an earth).
INPUT BALANCED
XLR (Female)
Mic Input
Shield
2
1
3
Signal
Pin 1: Earth, Pin 2: Signal In Phase (hot), Pin 3: Signal Out of Phase (cold)
3. Connect the mixer to an amplifier using a suitable cable. See figure 3 for connection details when wiring from 3 Pin
Male XLR outputs to RCA connectors or 3 pin XLR inputs.
(Note that a balanced line uses three wires (two signal wires and one earth wire or shield) where an unbalanced cable
uses only one signal wire and an earth).
2
Redback® Proudly Made In Australia
From Microphone
Figure 2. XLR microphone connection details.
INPUT UNBALANCED
XLR (Female)
Mic Input
Shield
2
1
3
Signal
www.redbackaudio.com.au
From Microphone
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