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
42
Redbox User Handbook No 2
Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed channel to 2 stereo
channels, or a mono channel to two mono paired outputs (i.e. the same signal to both
ear pieces) by using the push button, mounted on the rear panel to prevent accidental
switching.
Mono Mix Input (RB-HD1)
The XLR-3 input connector can take balanced professional levels, or unbalanced by
connecting the non-phase to the signal ground. This input is used for mixing with the main
stereo input, which is controlled by the MIX_EN pin (pin 8 on the remote connector) on
the remote connector. While this signal is shorted to the ground pin (pin 9 on the remote
connector) mixing is enabled and is only disabled once the signal from MIX_EN to pin 9 is
open on the remote connector. The XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Mono Mix Input Gain Adjustment (RB-HD1)
A rotary pre-set potentiometer can be used to adjust the gain of the mono mix input by
22dBu.
Local/Remote Control Operation (RB-HD1)
The level to the two outputs can be controlled in one of two ways, either locally, by the pot
situated on the front panel or remotely, by a VCA signal supplied externally to the remote
connector.
Remote Connector (RB-HD1)
The remote connector is a 9-pin D-type socket, which is situated on the rear panel. It has
connections as shown below.
Pin No. Signal I/O Description
Pin 1 Pot wiper I Volume control signal
Pin 2 Pot top O +5V
Pin 3 N/C - No connection
Pin 4 N/C - No connection
Pin 5 N/C - No connection
Pin 6 Pot bottom - Ground
Pin 7 N/C - No connection
Pin 8 MIX_EN I Make to pin 9
Pin 9 0V - Ground
Fig 11-9: RB-HD1 Remote Connector
HEADPHONE DISTRIBUTION AMPLIFIERS-RB-HD1 & RB-HD2
HEADPHONE DISTRIBUTION
AMPLIFIERS
11