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Sonifex RB-DAC1 User Manual

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4 RB-DAC1 Digital to Analogue Converter

Introduction

Fig 4-1: RB-DAC1 Front Panel
Using 24 bit, 96kHz capable devices, the RB-DAC1 Digital to Analogue Converter is a 1U
rack-mount which produces a stereo balanced XLR or unbalanced phono output from an
incoming AES/EBU or S/PDIF digital input signal. There is also a headphone output for
monitoring purposes.
The analogue outputs have an output level control, allowing full-scale settings selectable
from +12dBu, +18dBu or +24dBu. De-emphasis on the output can be enabled via
dipswitch.
There is a button to select either the AES/EBU or S/PDIF input for the D/A converter, which is
located on the rear panel.
When operating, the front panel power LED flashes whenever the unit is not synchronised
to the incoming digital signal.

System Block Diagram

AES/EBU
Digital
Input
Digital Source
S/PDIF
Selector
Fig 4-2: RB-DAC1 System Block Diagram
Redbox User Handbook No 1
DIGITA L AUDI O CONV ERT ERS
AES
DAC
Receiver
4
Volume Control
Stereo
Headphone
Output
L
Professional
Output
R
L
Consumer
Output
R
25

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Summary of Contents for Sonifex RB-DAC1

  • Page 1: System Block Diagram

    Introduction Fig 4-1: RB-DAC1 Front Panel Using 24 bit, 96kHz capable devices, the RB-DAC1 Digital to Analogue Converter is a 1U rack-mount which produces a stereo balanced XLR or unbalanced phono output from an incoming AES/EBU or S/PDIF digital input signal. There is also a headphone output for monitoring purposes.
  • Page 2 Indicator Output Control Fig 4-3: RB-DAC1 Front Panel Sync & Power Indicator The LED on the front panel is normally red to indicate that power is present on the unit. However, it also has a secondary role to indicate the status of the digital inputs : Flashing between red and amber –...
  • Page 3 De-emphasis On De-emphasis Off Reserved Fig 4-5: RB-DAC1 Full Scale Digits and De-emphasis Settings Switches Output Level Adjustment The output gain can be adjusted by dipswitches on the rear panel. The output gain can be set for a signal of full-scale digits in the digital domain to give +12, +18 or +24dBu output on the XLR connectors.
  • Page 4 D I G I TAL AUD IO CO NV ERTERS De-emphasis Switch If de-emphasis is selected (switch 3) the RB-DAC1 will decode 50/15µs emphasis when indicated by certain channel status bits in the incoming digital audio data. Digital Select Button This button is used to switch the digital input from the AES/EBU XLR connector (button out) to the S/PDIF phono connector (button in).
  • Page 5 Gain Select: Selectable 12dBu, 18dBu or 24dBu output level, ref. FSD De-emphasis On/Off: Dipswitch Equipment Type RB-DAC1 Digital to Analogue Converter Physical Specifications Dimensions (Raw) 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U) Dimensions (Boxed) 53cm (W) x 20.5cm (D) x 6cm (H)

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