Handbook

Table Of Contents
Redbox User Handbook No 3
37
Sync & Power Indicator
The LED on the front panel is normally red to indicate that power is present on the unit.
However, it also has a secondary role to indicate the status of the digital inputs: Fast ashing
between red and amber indicates a loss of digital input signal, or that the unit is being
calibrated.
Input Level Adjustment
Front panel potentiometers, coarse and ne, allow for adjustment of the gain of each
microphone input. The recessed screw-head potentiometer coarse control provides a total
gain range of 44dB, with the level knob ne control providing a ±12dB adjustment.
Connect the mic input and adjust the gain until the line output is at the level that you need.
The wide gain range allows the use of both dynamic and powered microphones.
Disabling the Fine Gain Control Knob
Each ne control also has the ability to be disabled via a jumper (JP1 for MIC1 and JP2 for
MIC2) situated on the PCB. When the jumper is tted the control is enabled.
Fig 6-4: Jumpers to Disable Fine Gain Control.
Input Level Indicators
For each input there is a tri-colour LED to give an indication of the level of the incoming mic
signals. Green indicates -18dBFS, orange indicates -12dBFS and red indicates -6dBFS.
Rear Panel Connections and Operation
Fig 6-5: RB-DMA2 Rear Panel.
JP2
JP1
Mic
Inputs
Analogue
Line
Outputs
AES/EBU
Output
S/PDIF
Sync
Input
AES/EBU
Sync
Input
Status
Select
Switches
Phantom
Power &
LF Filter
Freq’ & Sync
Mode Rotary
Switch
Word
Clock Sync
Input
S/PDIF
Output
Digital Sync &
Output Select
Buttons
MICROP HONE AMPLIF IERS
& LIMITERS
MICROPHONE AMPLIFIERS & LIMITERS - RB-DMA2
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