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Sonifex RB-LU4 Quad Stereo Balanced to Unbalanced Converter

£324.00 £270.00 (ex. vat)

Sonifex RB-LU4

  • Sonifex RB-LU4
  • Sonifex RB-LU4
  • Sonifex RB-LU4 Rear

Sonifex RB-LU4 Quad Stereo Balanced to Unbalanced Converter

The Sonifex RB-LU4 is a 1U rack-mount quad stereo unit for interfacing professional balanced line levels to domestic or semi-pro unbalanced equipment, e.g. for connecting a pro satellite receiver to a consumer hi-fi system. All connections are on the rear panel. The eight balanced XLR-3 inputs have an impedance of 20kΩ and are routed to eight unbalanced RCA outputs with an output impedance of <50Ω.

The output gain can be individually adjusted for left and right channels by using pre-set potentiometers accessible through the rear panel. A LED power indicator on the front panel displays the power supply connection.

Sonifex RB-LU4 Specifications

Audio Specification

  • Maximum Input Level: +28dBu
  • Input Impedance: (XLR) >20kΩ balanced bridging
  • Output Impedance (RCA): <50Ω
  • Maximum Output Level: +22dBu
  • Distortion: 0.01% THD @ 1kHz, ref +8dBu output
  • Noise: -100dB, unity gain, ref +8dBu output
  • Common Mode Rejection: >66dB typically
  • Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
  • Gain Range: Unbalanced Output : -28dBu to 0dBu, ref 0dBu into balanced XLR input   


  • Inputs: 8 x XLR 3 pin female (Balanced)
  • Outputs: 8 x RCA phono (Unbalanced)
  • Mains Input: Filtered IEC, switchable 110-120V, or 220-240V, fused, 6W max
  • Fuse Rating:
    • Anti-surge fuse 100mA 20 x 5mm (230VAC) 
    • Anti-surge fuse 250mA 20 x 5mm (115VAC)      

Physical Specification

  • Dimensions:
    • 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
    • 19” (W) x 4.3” (D) x 1.7” (H) (1U)
  • Weight:
    • Nett: 1.3kg Gross: 1.9kg
    • Nett: 2.9lbs Gross: 4.2lbs
Manufacturer Sonifex
Model Sonifex RB-LU4
Sonifex RB-LU4
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