Manual
Table Of Contents
- Contents
- Figures
- Warranty
- Safety Information
- 1 RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo Unbalanced To Balanced Converters
- 2 RB-LU4 Quad Stereo Balanced To Unbalanced Converter
- 3 RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
- 4 RB-PA2 Dual Stereo RIAA Phono Amplifier
- 5 RB-LI2 Stereo Line Isolation Unit
- 6 RB-PLI6 6 Way Mono Passive Line Isolation Unit
- 7 RB-DA6 & RB-DA6G 6 Way Stereo Distribution Amplifier
- 8 RB-DA4x5 4 Input 4 x 5 Output Distribution Amplifier/Mixer
- 9 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution Amplifier and RB-DDA6S 6 Way Stereo S/PDIF Dig
- 10 RB-DDA6W 6 Way Word Clock Distribution Amplifier
- 11 RB-HD1 Stereo Headphone Amplifier & RB-HD2 Dual Headphone Amplifier
- 12 RB-HD6 6 Way Headphone Distribution Amplifier
- 13 RB-DHD6 Digital 6 Way Headphone Distribution Amplifier
- 14 Connectors & Cabling
- Glossary
Redbox User Handbook No 2
7
Rear Panel Connections and Operation
Fig 2-3: RB-LU4 Rear Panel.
Inputs 1-4 (Left and Right)
The XLR 3 pin sockets used for the left and right channel inputs of Input 1 are electronically
balanced and have an impedance of 20kΩ bridging. They are routed to an unbalanced
RCA (phono) output with an output impedance of <50Ω. Each XLR has the following
connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
RCA Phono Outputs 1-4 (Left and Right)
These RCA (phono) outputs are unbalanced and have an output impedance of <50Ω.
Output Level Adjustment
The output gain can be individually adjusted for left and right channels through pre-set
potentiometers which are accessible through the rear panel. The gain of the balanced to
unbalanced converter is variable within a range of -28dBu to +15dBu ref. -15dBu into the
balanced input.
RCA
Phono
Outputs
Stereo Balanced
Inputs
Output
Level
Adjustment
MATCHING CONVERTERS - RB-LU4
MATCHING CONVERTERS
2