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Sonifex RB-DAC1 Digital to Analogue Converter
The RB-DAC1
The RB-DAC1
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Using 24 bit, 96kHz capable devices, the RB-DAC1 D/A 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 with volume control for monitoring purposes.

The analogue outputs have an output level control, allowing full-scale settings selectable from +12dBu, +18dBu or +24dBu. The RCA phono outputs have a further 8.5dBu attenuation incorporated.

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. Additionally, if de-emphasis is selected, the RB-DAC1 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 flashes whenever the unit is not synchronised to the incoming digital signal.

  Audio Specification
Maximum Output Level+24dBu balanced, +14dBu unbalanced
+12dBu headphone
Output Impedance<50ohm balanced, <75ohm unbalanced
Dynamic Range>100dB
Gain RangeSelectable 12dBu, 18dBu or 24dBu output level, ref FSD
Headphone OutputDrives 150mW into 32ohm to 600ohm professional headphones
Noise and Distortion<0.01% THD + N @ 1kHz
Sample Frequency Range30kHz - 100kHz
  Connections
Digital Inputs1 x AES/EBU XLR 3 pin female
1 x S/PDIF RCA phono
Analogue Outputs2 x XLR 3 pin male (balanced)
2 x RCA phono (unbalanced)
Headphone Outputs1 x 6.35mm A/B-gauge 3-pole stereo jack socket
Mains InputFiltered IEC, 110-120V, or 220-240V, fused, 10W max
  Operational Controls
Digital Input SelectAES/EBU or S/PDIF, via push-switch
Gain SelectDIP switch
De-emphasis On/OffDIP switch
  Physical Specification
WeightNett: 1.4kg
Gross: 2.0kg
DimensionsRaw: 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Boxed: 53cm (W) x 20.5cm (D) x 6cm (H)

  Equipment Type
  Code  DescriptionPlug
RB-DAC1 UKDigital to Analogue Converter, 230V (UK 3 pin to IEC)UK
RB-DAC1 EUDigital to Analogue Converter, 230V (European Schuko 2 pin to IEC)EU
RB-DAC1 USDigital to Analogue Converter, 115V (USA 3 pin to IEC)US
RB-DAC1 AUDigital to Analogue Converter, 230V (Australasian 3 pin to IEC)AU

  Accessories for this Product
  Code  Description  
RB-RK21U rear panel rackmount kit for small RedboxRK2
RB-FR2Front panel kit without rack mountingFR2


Sonifex Ltd. 61 Station Road, Irthlingborough, Northants, NN9 5QE, UK.
Tel: +44 (0)1933 650700 Fax: +44 (0)1933 650726 EMail: sales@sonifex.co.uk