Handbook

Redbox User Handbook No 2
49
Volume
Controls
Sync & Power LED
Headphone Outputs
13 RB-DHD6 Digital 6 Way Headphone Distribution Amplier
Fig 13-1: RB-DHD6 Front Panel.
The RB-DHD6 digital 6 way headphone distribution amplier is a 1U rack-
mount which receives a digital input signal, as either AES/EBU or S/PDIF and
converts it to 6 individually buered, jack-plug, headphone outputs, each with
their own volume control.
Useful for connection to digital mixing desks, digital routers and matrices, the RB-DHD6
connects directly to an AES/EBU or S/PDIF output to provide the highest quality audio
directly to the headphones. The input connectors consist of a single balanced XLR-3 for the
AES/EBU input and a single unbalanced phono connector for the S/PDIF input.
A button located on the rear panel is used to select either the AES/EBU, or S/PDIF, input and
de-emphasis on the output can be controlled via dipswitch. If de-emphasis is selected, the
RB-DHD6 will decode 50/15µs emphasis when indicated by certain channel status bits in the
incoming digital audio data.
When operating, the front panel power LED ashes red and amber whenever the unit is not
synchronised to the incoming digital signal.
System Block Diagram
Fig 13-2: RB-DHD6 System Block Diagram.
Front Panel Indicators & Controls
AUDIO DISTRIBUTION AMPLIFIERS - RB-DHD6
Introduction
AUDIO DISTRIBUTION
AMPLIFIERS
13
AES/EBU Volume
Control
Stereo Jack
Output
X6
S/PDIF
Digital
Input
Audio
Output
Amp
AES
Receiver
DAC
Fig 13-3: RB-DHD6 Front Panel Controls.