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 8 - RB-HD1 Stereo Headphone Amplifier
Redbox User Handbook 8-3
8.4. Rear Panel Connections and Operation
Disconnect the mains supply before removing the equipment covers.
This product must be eart hed
MONO MIX I NPUT
LEVEL
HEADPHONE
L - INPUT - R
REMOTES
MONO
STEREO
REMOTES
LOCAL
Fig 8-4: RB-HD1 Rear Panel
8.4.1. Stereo Input (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or unbalanced by
using the volume control to increase the input level, and by connecting the non-phase
to the signal ground. The input can be configured as either a stereo input with two
stereo outputs or a mono input with two mono paired outputs. The XLR 3 pin input has
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
8.4.2. Mono Mix Input
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
A rotary pre-set potentiometer can be used to adjust the gain of the mono mix input
by 22dBu.
8.4.3. Stereo/Mono Operation
The mode of operation may be switched between a stereo channel, or a mono channel
to two mono paired outputs (i.e. the same signal to both earpieces), by the push
button on the rear panel which is recessed to prevent accidental switching.
8.4.4. Local/Remote Control Operation
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.