www.altronics.com.au
User manual revision number: 1.0 10/07/2015
Operating Manual
A 4905
Mic/Line Pre-amp to Line Level Out
Redback® Proudly Made In Australia
Distributed by Altronic Distributors Pty. Ltd.
Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au
OVERVIEW
This line pre-amp will accept either a microphone or auxiliary input and convert it to a balanced high level signal suitable
for distribution up to 500M without interference with up to 3V of output level available. Volume controls are provided for
both inputs plus a master volume control. The microphone is a balanced XLR input whilst the auxiliary input consists of 2 x
RCA sockets with a DIP switch attenuator to allow for 3 levels of input signals. The output is via a male 3 pin XLR.
OPERATION
A signal is fed into either of the two inputs. Either a Balanced Mic Input with an input level of 1.5mV, or a line level input
with an input level sensitivity which is DIP switch selectable to 200mV, 500mV or 1V. The Mic input and the Aux inputs
have dedicated volume controls and the output volume is set by the Master volume control.
The unit is powered from 24V DC only.
PHANTOM POWER
DIP switch 1 selects phantom power to the microphone input. This is 15V DC and is applied to the hot and cold pins of
the microphone input.
FEATURES
• XLR Mic input
• RCA Aux input
• XLR balanced output.
• Phantom power to Mic Input (15V DC).
• Controls for AUX, MIC and master volume.
• DIP Switch selectable AUX input sensitivity.
• 24VDC operation via 2.1mm DC power jack.
SPECIFICATIONS
Power:............................................ 24V DC Input (2.1mm)
Max current draw:....................................... 40mA @ 24V
Frequency response:......................30Hz to 10KHz (±0.5dB)
Noise:....................................................................> -50dB
Controls: ...............................Master, Mic and Aux volume
Weight: .............................................................. ≈ 240gm
Dimensions: .............................. ≈ 133W x 65D x 44H mm
Colour: ......................................................................Black
Input:
XLR (Microphone): ....................Reference level, 1.5mV
RCA (Auxiliary): ....................Dip switch selectable level
(Nominal: 0.2V, 0.5V, 1V)
Mic input impedance: ...........................600Ω Balanced
Line input impedance: .........................................10kΩ
Output:
Connection: .......................Balanced 3V XLR (8.5V p-p)
Output load required: .............600Ω nominal, balanced
Output level: ..................................................+15dBM
*Specifications subject to change without notice
