Using Phantom Powered Microphones; Using The Lf Filter; Output; Fig 5-5: Switch To Control Lf Filter And Phantom Power - Sonifex Redbox RB-SS10 User Handbook Manual

On On
1 2 3 4
On On

Fig 5-5: Switch to Control LF Filter and Phantom Power.

Using Phantom Powered Microphones

For the input channel there are independent switches to provide phantom power at +48V
to the connected microphones. 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 used when the switch is pointing
towards the arrow.

Using the LF Filter

A switch also provides control for a high pass filter with low frequency roll off at 125Hz. The
filter is in when the switch is in the down position (towards the arrow).

Output

The XLR 3 pin plug output connector is electronically balanced and can be wired
unbalanced by grounding the non-phase signal, allowing you to feed balanced and
unbalanced equipment. It has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
The connector provides a line level output with an impedance of <50Ω and a maximum
output level of +28dBu.
Redbox User Handbook No 3
MICROPHONE AMPLIFIERS
1 Channel 1 Low Frequency (LF) Filter
2 Channel 1 Phantom Power
3 Channel 2 Phantom Power (only applies to MA2)
4 Channel 2 Low Frequency
& LI MI TE R S
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