Advertisement
REDBACK A 4425A Mixer
Instructions For Use
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.
Installing the tone generator
A 4573:
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 genera-
tor plate was attached).
6. Refit lid and secure with screws.
NOTE: Tones are operated by closing contacts and remain operat-
ing whilst contacts are closed. The A 4573 assumes priority 2
when installed
A 4426 standoffs
Page 2
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.
Installing the compressor
A 4426:
1. Remove lid from unit
2. Locate tone generator 10 way header on board (this is located in
4. Connect ribbon cable header to the 10 way header on the board
5. The compressor board is mounted onto 4 plastic standoffs locat-
6. Refit lid and secure with screws.
A 4426 header
MIC2
MIC1
VOX Muting
Sensitivity
Adjust
A 4573 & A 4426 Header Locations
the middle of the main board)
of mixer.
ed on the main printed circuit board.
A 4573 header
EVAC
MIC3
Advertisement
