Stereo Monitor Inputs; Stereo Monitor Pad & Volume Control; Mic Input; Mic Input Gain - Sonifex Redbox RB-SS10 User Handbook Manual

Stereo Monitor Inputs

The 2 x XLR 3 pin sockets used for the monitor input are electronically balanced. They have
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Note: The monitor input can not be mixed to the stereo line output, it is only used for
headphone monitoring.
Stereo Monitor Pad & Volume Control
A 10dB gain pad is available by depressing the rear panel switch, for handling connection
from unbalanced outputs. A MONITOR VOLUME control is available as a pre-set
potentiometer, located on the back panel. The monitor input channel with the volume
control fully up, has a gain of +6dB.

Mic Input

The XLR 3 pin socket used for the microphone is electronically balanced. It has the following
connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase

Mic Input Gain

A recessed GAIN pre-set potentiometer allows for adjustment of the gain of the microphone
input. This provides a gain range of 36dB to 75dB which enables the use of dynamic and
powered microphones. Connect the mic input and adjust the gain until the line output is at
the required level. The front panel MIC VOLUME reduces the volume to –80dB.

Using Phantom Powered Microphones

For the microphone input channel there is a switch to provide phantom power at +48V to
the connected microphone. With phantom power selected, a voltage of +48V is applied to
pins 2 and 3 of the XLR connector to power the microphone, supplied through 6k8 resistors
giving a current of 14mA. Phantom power is enabled when the switch is pointing towards
the arrow.
On Off
1 2 3 4
On On
Fig 4-4: DIP Switch to Control Mic & Meter Features.
Redbox User Handbook No 3
MIXER & SOURCE SELEC TORS
1 Low Frequency (LF) Filter
2 Phantom Power
3 Compress In Mic Mode Only
4 LED Meter Peak Hold
4
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