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The Sonifex RB-DAC1 Digital to Analogue Converter uses 24 bit, 192kHz 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.

Sonifex RB-DAC1 Digital to Analogue Converter

  • Full Datasheet and brochure can be seen here

  • Audio Specification

    Balanced Output

    Unbalanced Output

    Headphone Output

    Maximum Output Level: +24dBu +15.5dBu +20dBu (ref. <0.01% THD)
    Output Impedance: <50Ω <75Ω Drives 150mW into 32Ω to 600Ω professional headphones
    Dynamic Range: 115dB 115dB 100dB
    Gain Range: Selectable 12dBu,
    18dBu or 24dBu output level, ref FSD
    Selectable 3.5dBu,
    9.5dBu or 15.5dBu
    output level, ref FSD
    -80dBu (volume 0%) to +20dBu (volume 100%) ref FSD
    Distortion & Noise: <0.005% THD+N
    @1kHz, ref +8dBu
    <0.005% THD+N
    @1kHz, ref -6dBV
    <0.005% THD+N @1kHz, ref +8dBu
    Sample Freq. Range: 32kHz - 192kHz

    Operational Controls

    Digital Input Select: AES/EBU or S/PDIF, via push-button
    Gain Select: DIP switch
    De-emphasis On/Off: DIP switch


    Digital Inputs: 1 x AES/EBU XLR 3 pin female
    1 x S/PDIF RCA phono
    Analogue Outputs: 2 x XLR 3 pin male (balanced)
    2 x RCA phono (unbalanced)
    Headphone Output: 1 x ¼” (6.35mm) A/B-gauge 3-pole stereo jack sockets
    Mains Input: Filtered IEC, 110V-120V, or 220-240V, fused, 18W max
    Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
    Anti-surge fuse 250mA 20 x 5mm (115VAC)

    Equipment Type

    RB-DAC1: Digital to analogue converter

    Physical Specification

    Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
    19” (W) x 4.3” (D) x 1.7” (H) (1U)
    Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
    23” (W) x 8.9” (D) x 2.8” (H)
    Weight Nett: 1.4kg  Gross: 2.0kg
    Nett: 3.1lbs Gross: 4.4lbs
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