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Sonifex RB-BL2 Unbalanced to Balanced Bi-Directional Converter
The RBBL2

The RB-BL2 is a bi-directional stereo unit for interfacing domestic, or semi-pro unbalanced equipment to professional balanced line levels, and vice-versa.

All connections are on the rear panel. The two XLR-3 electronically balanced inputs have an impedance of 20k ohms bridging and are routed to two unbalanced RCA (phono) outputs with an output impedance of <50 ohms.

The two RCA unbalanced inputs have an impedance of 10k ohms and are routed to two balanced XLR-3 outputs with an output impedance of <50 ohms.

The output gain can be individually adjusted for left and right channels by using pre-set potentiometers accessible through the rear panel.

  Audio Specification
Maximum Input Level+28dBu
Maximum Output Level+28dBu
Input Impedance (RCA)>10kohms unbalanced
Input Impedance (XLR)>20kohms balanced bridging
Output Impedance (RCA)<50ohms
Output Impedance (XLR)<50ohms
Distortion0.01% THD @ 1kHz, ref +8dBu output
Noise-100dB, unity gain, ref +8dBu output
Common Mode Rejection>66dB typically
Frequency Response20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Gain RangeUnbalanced output: -28dBu to +15dBu, ref -15dBu into balanced XLR input
Gain RangeBalanced output: -15dBu to +15dBu, ref -15dBu into unbalanced RCA input
  Connections
Audio Inputs2 x XLR 3 pin female (balanced), 2 x RCA phono (unbalanced)
Audio Outputs2 x XLR 3 pin male (balanced), 2 x RCA phono (unbalanced)
Mains InputFiltered IEC, switchable 110-120V, or 220-240V, fused, 6W max
  Physical Specification
WeightNett: 1.0kg
Gross: 1.4kg
DimensionsRaw: 28cm (W) x 10.8cm (D) x 4.2cm (H)
Boxed: 36cm (W) x 20.5cm (D) x 6cm (H)

  Equipment Type
  Code  DescriptionPlug
RB-BL2 UKBalanced to Unbalanced Bi-Directional Converter, 230V (UK 3 pin to IEC)UK
RB-BL2 EUBalanced to Unbalanced Bi-Directional Converter, 230V (European Schuko 2 pin to IEC)EU
RB-BL2 USBalanced to Unbalanced Bi-Directional Converter, 115V (USA 3 pin to IEC)US
RB-BL2 AUBalanced to Unbalanced Bi-Directional Converter, 230V (Australasian 3 pin to IEC)AU

  Accessories for this Product
  Code  Description 
RB-RK11U front panel rackmount kit for small RedboxRK1
RB-RK21U rear panel rackmount kit for small RedboxRK2


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