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Sonifex RB-SM2 Dual Stereo to Mono Converter
The RBSM2
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The RB-SM2 consists of two independent converters which will produce two fully buffered and balanced mono line outputs from two stereo inputs.

All connections are on the rear panel. The XLR-3 inputs are electronically balanced with an impedance of 20kohm bridging. These can be wired unbalanced to accept an output from domestic equipment.

The XLR-3 line outputs are electronically balanced with an output impedance of <50 ohm. The outputs can be wired unbalanced by grounding the non-phase signal, allowing you to feed balanced and unbalanced equipment.

Output gain adjustment using pre-set potentiometers for both converters allows a normalised mono output from domestic stereo equipment. The potentiometers are accessible through the rear panel.

  Audio Specification
Maximum Input Level+28dBu
Maximum Output Level+28dBu
Frequency Response20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Gain RangeAdjustable 8dB loss to 18dB gain, ref. 0dBu in on L and R
Common Mode Rejection>66dB typically
DistortionTHD @ 1kHz +8dBu 0.01%
Noise-100dB unity gain ref +8dBu
Input Impedance>20kohm balanced bridging
Output Impedance<50ohm
  Connections
Inputs4 x XLR 3 pin female (balanced, can be unbalanced)
Outputs2 x XLR 3 pin male (balanced, can be unbalanced)
Mains InputFiltered IEC, switchable 110-120V, or 220-240V, fused, 6W max
  Physical Specification
WeightNett: 1.05kg
Gross: 1.5kg
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-SM2 UKDual Stereo to Mono Converter, 230V (UK 3 pin to IEC)UK
RB-SM2 EUDual Stereo to Mono Converter, 230V (European Schuko 2 pin to IEC)EU
RB-SM2 USDual Stereo to Mono Converter, 115V (USA 3 pin to IEC)US
RB-SM2 AUDual Stereo to Mono 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