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Redback A4915 Operating instructions

  • Hello! I've reviewed the operating manual for the Redback Input Mixer A 4915. This device is a compact 2-input mixer with features like VOX muting, phantom power for microphones, and a switched 24V DC output. It has balanced and unbalanced I/O and allows you to adjust input volume and VOX sensitivity. I'm ready to answer your questions about this device.
  • What type of inputs does the mixer accept?
    How does the VOX muting work?
    Can I use phantom power with this device?
    How do I enable the 24V DC output?
www.redbackaudio.com.au Redback® Proudly Made In Australia 1
Redback® A 4915 2 Input Mixer with VOX/PTT Muting
User manual revision number: 1.0 31/07/2023
Operating Manual
A 4915 2 Input Mixer With VOX/PTT Muting
Distributed by Altronic Distributors Pty. Ltd.
Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au
2.0 OVERVIEW
The A 4915 is a compact 2 input mixer which will accept either a line level signal or balanced microphone signal for each
input. The output signal is suitable for feeding an amplier with either a line level input or balanced microphone input.
Input one will VOX mute input 2.
INPUTS AND OUTPUTS
Line level inputs and outputs are via stereo RCA sockets. Balanced microphone input and outputs are via 3 pin XLR.
OPERATION
Any signal applied to input one, will VOX mute any signal applied to input 2 when the VOX DIP switch is enabled. This is
regardless of the type of signal i.e. line input signal feeding input 1 will VOX mute a mic input signal feeding input 2.
When the VOX DIP switch is not enabled, signals present at input 1 and 2 are mixed.
CONTROLS
Individual tamper proof controls are provided for input 1 volume, input 2 volume and VOX switch sensitivity.
24V DC out is provided via a 2 way euro block when the VOX operates.
PHANTOM POWER
12V DC phantom power is always available to the hot and cold pins of the XLR microphone inputs.
SWITCHED 24V OUTPUT
24VDC output is turned on when both the 24V out and VOX activation DIP switches are in the ON position and the VOX
circuitry has been activated.
www.redbackaudio.com.auRedback® Proudly Made In Australia2
Redback® A 4915 2 Input Mixer with VOX/PTT Muting
3.0 A 4915 FRONT PANEL CONTROLS
1 Volume 1 & 2
Adjusts output volume of each input.
2 VOX Sensitivity Adjustment
Adjusts the sensitivity of the VOX muting circuitry.
3 DIP Switches
DIP switch 1 set to ON for VOX activation.
DIP switch 2 set to ON to enable the 24V DC switched output.
DIP switch 3: Sets the Balanced Out level. Set to ON for Mic level and OFF for Line level.
DIP switch 4 not used.
4 Microphone Output
A balanced output for connection to a balanced input on an amplier/pre-amp.
5 Auxiliary Output
A standard stereo RCA output for connection to an amplier/pre-amp.
6 Power Indicator
Indicates when the unit has power.
7 24V DC Output
This output is enabled when DIP switch 2 selection for 24V is in the ON position.
4.0 A 4915 REAR PANEL INPUTS
1 24V DC Input
Provides power to the unit via 2.1mm DC jack.
2 Microphone Input 2
A balanced input for connection to balanced audio sources and microphones.
3 Auxiliary Input 2
A standard stereo RCA input for connection to an audio source.
4 Auxiliary Input 1
A standard stereo RCA input for connection to an audio source.
5 Microphone Input 1
A balanced input for connection to balanced audio sources and microphones. A PTT connection is also provided
for Push To Talk muting of input 2.
Balanced
Out
L
R
Line
Out
A 4915 2 Input Mixer
DIP
Switches
Power
24V DC
Out
+_
VOX
Sens.
Vol 1 Vol 2
1 2 3 4
12 3 4 5 7
21
3
1 2 3 4
6
Line 2
L
R
Line 1 Mic 1
+
-
24V
DC In
www.redbackaudio.com.auManufactured in Australia By Altronic Distributors Pty. Ltd.
Mic 2
2 1
3
2 1
3
12 3 4 5
/