Rb-Sl2 Twin Mono, Or Stereo, Limiter; Introduction; System Block Diagram; Fig 8-1: Rb-Sl2 Front Panel - Sonifex Redbox RB-SS10 User Handbook Manual

8
MICROPHONE AMPLIFIERS
& LI MI TE RS

8 RB-SL2 Twin Mono, or Stereo, Limiter

Introduction

Fig 8-1: RB-SL2 Front Panel.

The RB-SL2 is a stereo, or twin independent mono, VCA limiter for use in news-rooms and
other locations where the correct level into recording equipment is required, but not
necessarily under the control of an engineer, for example, for overload protection. It can also
be used as an inexpensive main output limiter for low cost radio installations, RSL's, hospital
and student radio.
The XLR-3 electronically balanced inputs and outputs can be wired unbalanced to accept an
output from domestic equipment. For each channel there is an input gain and a threshold
level control.
A rear panel switch changes the unit from dual mono to stereo, when only the pre-sets for
channel 1 (left) are active and apply to both channels. An LED power indicator on the front
panel displays the power supply connection and also indicates limiting.
1) Steady "Amber" indicates that the unit is powered and not in limiting.
2) Flashing "Amber" "Red" indicates that input 1 left channel is in limit.
3) Flashing "Amber" "Green" indicates that input 2 right channel is in limit.
4) Flashing "Amber" on and off indicates that both inputs are in limit.
Please note that all four conditions are possible in "Dual Mono" mode but only conditions
1 and 4 are valid in "Stereo" mode.

System Block Diagram

Balanced
Professional
Input L
Balanced
Professional
Input R

Fig 8-2: RB-SL2 Block Diagram.

50
Power LED & Limit Indicator
Gain and
Select Stereo/Mono
Gain and
Limiter
Stage
Limit
Control
Limit
Control
Limiter
Stage
Balanced
Professional
Output L
Balanced
Professional
Output R
Redbox User Handbook No 3