Sonifex RB-LU4 Quad Stereo Balanced to Unbalanced Converter

Availability:In stock
Cat No.

Order Now - Usually available to despatch in 7-10 days

£485.94 £404.95
- +
  • Free UK Delivery

    Free UK Delivery

    On orders over £250

  • Price Match

    Price Match

    Request here

Product Information

Sonifex RB-LU4 Quad Stereo Balanced to Unbalanced Converter

The 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 20kohms and are routed to eight unbalanced RCA outputs with an output impedance of 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.

  • 1U Rack-mount
  • 8 Balanced XLR-3 Inputs


  • Maximum Input Level: +28dBu
  • Input Impedance (XLR): >20 kohms balanced bridging
  • Output Impedance (RCA): Maximum Output Level: +22dBu
  • Distortion: 0.01% THD @ 1kHz, ref +8dBu output
  • Noise: -100dB, unity gain, ref +8dB output
  • Common Mode Rejection: >66dB typically
  • Frequency Response: 20Hz to 20kHz ±0.1dB (600ohm load, ref 1kHz)
  • Gain Range: Unbalanced Output : -28dBu to +15dBu, ref -15dBu into balanced XLR input


  • Inputs: 8 x XLR 3 pin female (balanced)
  • Outputs: 8 x RCA phono (unbalanced)
  • Mains Input: Filtered IEC, 110V-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 (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U), Boxed: 53cm (W) x 20.5cm (D) x 6cm (H)
  • Weight: Nett: 1.3kg Gross: 1.9kg
  • Nett: 2.9lbs Gross: 4.2lbs