Handbook

38
Redbox User Handbook No 1
DIGITAL AUDIO CONVERTERS - RB-DAC1
5
DIGITAL AUDIO CONVERTERS
RB-DAC1 Inputs
AES/EBU Input
The digital input XLR 3 pin socket has an impedance of 110Ω. It has the following
connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
The signals on this connector should meet the IEC 60968 specication
S/PDIF Input
The S/PDIF digital phono input has an impedance of 75Ω.
RB-DAC1 Outputs
Analogue Outputs (Left and Right)
The XLR 3 pin output plug connectors are electronically balanced with an output
impedance of less than 50Ω. They have the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
RCA Phono Outputs (Left and Right)
These RCA (phono) outputs are unbalanced and have an output impedance of less
than 75Ω.
Rear Panel Controls
Full Scale dB Settings
Switch Number +12 +18 +24
1 OFF ON ON
2 OFF OFF ON
Emphasis Settings
3 ON De-emphasis On
3 OFF De-emphasis O
4 Reserved
Fig 5-5: 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. The consumer output on the phono connector has a further 8½dBu
attenuation incorporated.