Redbox User Handbook No 3
23
MIXER & SOURCE SELECTORS
Inputs 1-10
The XLR-3 input sockets can take balanced professional levels, or unbalanced by using the
front panel gain controls, and by connecting the non-phase to the signal ground screen. The
XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Outputs 1-4
The XLR 3 pin output plugs are electronically balanced, and can be wired unbalanced. Each
output is individually buffered so that a short circuit on one output will not affect the others.
They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Front Panel Controls
Fig 3-4: RB-PMX4 Front Panel Controls.
Switch Banks
There are 4 off 10-way switch banks, one for each output. Using these switches, each
input channel can be individually selected to each output. When the switches are up (OFF)
position, they are off and mixed when in the down (ON) position.
Input Gain Controls
The gain for each input may be individually varied from –8dB to 18dB by adjusting
the pre-set potentiometers, which are accessible through the holes in the front panel.
This is useful for normalising consumer and professional signals to give outputs of –15dBu
and 0dBu respectively.
INPUT LEVEL
1
2
10
9
8
7
6
5
4
3
M
IX
E
R
&
S
O
U
R
C
E
S
E
L
E
C
T
O
R
S
-
R
B
-P
M
X
4
3
Input Gain Controls
Switch Banks
