Manual
Table Of Contents
- Analogue Redbox User Handbook rev 1.92
- Contents
- Figures
- Warranty, Safety & Installation Information
- RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
- RB-SM1 Single & RB-SM2 Dual Stereo To Mono Converter
- RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced
- RB-LU4 Quad Stereo Balanced To Unbalanced Converter
- RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converte
- RB-SL2 Twin Mono, or Stereo, Limiter
- RB-DA6 6 Way Stereo Distribution Amplifier
- RB-HD1 Stereo Headphone Amplifier
- RB-HD6 6 Way Stereo Headphone Distribution Amplifier
- RB-SD1 Silence Detection Unit
- RB-PMX4 10 Input, 4 Output Analogue Preset Mixer
- RB-LI2 Stereo Line Isolation Unit
- RB-PLI6 6 Way Mono Passive Line Isolation Unit
- RB-SS10 10 Way Stereo Analogue Source Selector/Mixer
- RB-LC3 3 Way Light/Power Controller
- Glossary
- Connectors And Cabling
- Index
Chapter 1 - RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
Redbox User Handbook 1-1
1. RB-MA1 Single & RB-MA2 Dual
Microphone Amplifiers
1.1. Introduction
Fig 1-1: RB-MA1 & RB-MA2 Front Panel
The RB-MA1 consists of an independent low-noise microphone pre-amplifier for
converting microphone level signals to line level, or for driving long lines from
microphones to mixing equipment. The RB-MA2 dual microphone amplifier consists of
two low noise pre amplifiers.
All connections and controls are on the rear panel. The microphone input is XLR-3
type and is electronically balanced. The input gain can be adjusted individually by a
recessed pre-set potentiometer.
The XLR-3 line output is electronically balanced and can be wired unbalanced by
grounding the non-phase signal, allowing you to feed both balanced and unbalanced
equipment.
For each channel there are independent switches to control a high pass filter (low
frequency roll-off at 125Hz) and to provide phantom power at +48V to the connected
microphone. An LED power indicator on the front panel displays the power supply
connection.
The rest of this chapter will refer to both RB-MA1 and RB-MA2 unless stated
otherwise.