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REDBACK A 4425 Mixer
I
F
NSTRUCTIONS
OR
Remove the mixer from its packaging and inspect for any
damage. If the unit appears to be damaged then do not
operate as this may damage the unit further.
1. Prior to installation, set input configurations as desired
via the DIP switches on rear of unit. The table below
shows the various settings.
2. Plug in a low impedance microphone into the
microphone input, or a music source (tape or
Compact Disc or similar) into the line input.
3. Connect the mixer to an amplifier using a suitable
cable. See figure 2, Connection Details.
4. Turn all controls fully down and then switch the mixer
and amplifier on.
5. Turn up the level control associated with the input that
you are using to about half way. Talk into the
microphone (or play some music) and adjust the
Master level to achieve the required level.
I
NSTALLING THE TONE GENERATOR
A 2073:
1. Remove lid from unit
2. Unscrew tone generator plate from rear panel
3. Locate tone generator 10 way header on board (this
is located at the rear of the main board)
4. Connect ribbon cable header to the 10 way header
on the board of mixer.
5. The tone generator is held in by way of 2 screws
(supplied) through the rear panel (via the same holes
that the tone generator plate was attached).
6. Refit lid and secure with screws.
NOTE: Tones are operated by closing contacts and
remain operating whilst contacts are closed. The
A 2073 assumes priority 2 when installed
A 4426 standoffs
Page 2
U
SE
A 4426 header
A 2073 & A 4426 Header Locations
For the best sound performance turn the input level
control to a high setting (say 3/4 ) and use the Master as
the volume control. Use the other input level controls to
set the required mixing ratios. Adjust the bass and treble
controls to get the desired sound. For best performance
when using long lines between microphones/mixer and or
amplifier use balanced lines. These reduce noise or hum
that may be induced into the cables. Note that a balanced
line uses three wires (two signal wires and one screened
earth wire or shield) where an unbalanced cable uses
only one signal wire and a screened earth. See the
connection details (figure 2) for wiring up plugs etc.
Do not tamper with the unit. Warning Mains Voltage
is Present Inside. Leave servicing to qualified
personnel.
I
NSTALLING THE COMPRESSOR
A 4426:
1. Remove lid from unit
2. Locate tone generator 10 way header on board (this
is located in the middle of the main board)
4. Connect ribbon cable header to the 10 way header
on the board of mixer.
5. The compressor board is mounted onto 4 plastic
standoffs located on the main printed circuit board.
6. Refit lid and secure with screws.
A 2073 header
MIC2 EVAC
MIC1
MIC3
VOX Muting
Sensitivity
Adjust
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