Altronics Redback A 4036A User manual

A 4036A 40 Watt
A 4041A 60 Watt
A 4046A 100 Watt
Public Address Amplifier
®
www.altronics.com.au
Proudly Assembled in Australia
Operating
Instructions

REDBACK 40 Watt Public Address Amplifier
Page 2
Congratulations on purchasing a REDBACK PA Amplifier. This Public Address Amplifier has been engineered and
manufactured to a very high standard in Australia.
Features:
• 4 balanced microphone inputs / 4 aux inputs
• Phantom powering on mic inputs 1-4
• Wide frequency response 50Hz-15kHz, ±3dB
• Very low noise and distortion
• Tape out
• 100V, 70V and 4-16 Ohm outputs. (Note: 70V output not available on
A 4036A)
• 240V AC or 24V DC operation
• Bass and treble controls
• Evacuation tones via optional A 2073 evac module.
• Remote volume via optional 1K potentiometer.
• Desk or rack mountable
• Thermal overload protection
OPERATION
Microphones must be connected to the appropriate XLR input. Other “line level” music sources should be connected to
the RCA auxiliary inputs, e.g. tape players, CD players, etc. Each auxiliary input has stereo connections, which are
converted to mono internally.
Microphone Phantom Power Option
This facility is available on all microphones. Phantom powering can be turned on or off via internal PCB mounted
jumpers. To change the jumper settings, the lid of the amplifier must be removed. (Ensure power is dis-connected
before removing the lid). Locate the jumpers (on the circuit board, see fig 2) and select the option as indicated on the
circuit board. This option is set off at the factory.
Tape out: This is a line level output. Its output is affected by adjusting the volume on any input.
Vox muting: Available on inputs 1 and 2. Once activated (see fig 2) input 1 will override all other inputs including the
alert/evac input. Input 2 will override inputs 3 & 4. Both mic and aux inputs will activate the vox muting. These are
factory set in the OFF position.
When installing the amplifier attention must be given to the following points.
• Make sure that the total speaker load on the amplifier does not exceed its rating (40W A 4036A, 60W A 4041A, 100W
A 4046A). Don’t connect 8 ohm speakers to the 100V line output, this will severely overload the amplifier.
• Allow ventilation so that the amplifier can “breathe” i.e. don’t enclose in a sealed cupboard. Allow air to circulate
through the amplifier.
OPTIONAL EXTRAS
Alert/Evac option: Generates chime, alert and evacuation tones. Simply connect the alert/evac module (Altronics P/N:
A 4573) to the amplifier internally via IDC cable provided. Refer to fig 2 for connection location. Once activated the
A 4573 will mute inputs 2, 3 and 4.
Remote volume option: Master volume can be adjusted by a remotely located volume control (Maximum distance
100m). This requires a two wire figure 8 cable and a 1K potentiometer (Altronics P/N: R 2202 or Altronics remote
wallplate P/N: A 2280B). This is connected to the two way connector on the rear of the amplifier (fig 2).
Pinouts of XLR Socket
(Looking at mic inputs rear of unit)
1. Earth/Shield
2. Signal Hot
3. Signal Cold
1
2
3
Fig1:
A 4036A / 41A / 46A Rear Panel

REDBACK 40 Watt Public Address Amplifier
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TROUBLESHOOTING
If the REDBACK amplifier fails to deliver the rated performance, check the following:
NO POWER, NO LIGHTS
Check the mains fuse, and the external DC fuse. Replace with only the correct type and rating. Make sure the amplifier
power switch is on. Make sure mains power switch is on at the wall.
DISTORTED OUTPUT
Check that the speaker type is correct for the output that you are using, ie 8Ω or 100V. Check for any short circuits on
the speaker line.
VERY LOW OUTPUT
Make sure that the input is the correct level (check for shorted connectors). Check for any short circuits on the speaker
line.
CONTINUALLY BLOWS FUSES
Make sure that the speaker line is not shorted. Check also speaker types, ratings and output.
AMPLIFIER KEEPS ON CUTTING IN & OUT
Make sure that there is adequate ventilation around the amplifier. Check the vent slots on the case are not covered or
blocked. Check the speaker types, ratings and for any short circuits on the speaker line.
VOX 1
ON
VOX 1
OFF
VOX ON/OFF SETTINGS
Alert/evac tone
generator connection header
Remote volume
connector
24V DC
Mic phantom power jumpers
Fig 2: Board Layout
VOX ON/OFF
Alert/Evac
Mute Level
VOX
Sensitivity

REDBACK 40 Watt Public Address Amplifier
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POWER OUTPUT
A 4036A: ..................................................................................................40 watts RMS
A 4041A: ..................................................................................................60 watts RMS
A 4046A: ................................................................................................100 watts RMS
Distortion:.............................................................................................< 0.5% @ 1kHz
SIGNAL TO NOISE RATIO
Typically 75dB below rated output. All inputs.
FREQUENCY RESPONSE
Mic inputs:.....................................................................................50Hz - 10kHz, -3dB
Aux inputs: ....................................................................................60Hz - 15kHz, -3dB
Output line:..............100V, 70V or 4 - 16Ω (note: 70V output not available on A 4036)
INPUT SENSITIVITY
Mic inputs:...........................................................................................1.5mV balanced
Aux inputs: .........................................................................................................410mV
OUTPUT CONNECTORS
Speakers:.............................................................................................Screw terminals
INPUT CONNECTORS
Mic Inputs: .....................................................................................3 pin XLR balanced
Aux inputs: ......................................................................................RCA stereo socket
Tape Out:.........................................................................................RCA stereo socket
24V DC power: ....................................................................................Screw terminals
240V AC power: ..........................................................................IEC power connector
Remote volume:..................................................................................Screw terminals
CONTROLS
Mic inputs:.........................................................................................................Volume
Aux inputs: ........................................................................................................Volume
Bass: ....................................................................................................±10dB @ 100Hz
Treble:..................................................................................................±13dB @ 10kHz
Power: ......................................................................................................On/off switch
Indicators: ...........................................................................................................Power
Overload
Power supply:................................................................................240V AC or 24V DC
PROTECTION
A 4036A: ............................................................................1A AC fuse and 4A DC fuse
A 4041A: ............................................................................2A AC fuse and 5A DC fuse
A 4046A: .........................................................................4A AC fuse and 7.5A DC fuse
WEIGHT/ DIMENSIONS
A 4036A:.............................................................................................................≈7.1 kg
A 4041A:..............................................................................................................≈7.4kg
A 4046A:.................................................................................................................≈9kg
Dimensions: .........................................................................≈423W x 225D x 88H mm
Colour: ..................................................................................................................Black
*Specifications subject to change without notice
SPECIFICATIONS
For repair or service please contact your place of purchase. Note: Under no circumstances should you attempt to repair the
unit yourself as this will invalidate the warranty! This appliance is not intended for use by young children or infirm persons
without supervision. Young children should be supervised to ensure they do not play with the appliance.
NOT FIELD SERVICEABLE.
Distributed By:
Altronic Distributors Pty Ltd. Perth W.A. 6000
Ph. 1300 780 999 Fax [phone]
www.altronics.com.au