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Sonifex RB-SM2 Dual Stereo To Mono Converter (used)

£132.00 £110.00 (ex. vat)

Sonifex RB-SM2 Used

  • Sonifex RB-SM2 Used
  • Sonifex RB-SM2
  • Sonifex RB-SM2
  • Sonifex RB-SM2 Rear

Sonifex RB-SM2 Dual Stereo To Mono Converter - Used

The Sonifex RB-SM2 is a dual version of the RB-SM1, consisting 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 20kΩ 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 <50Ω. The outputs can be wired unbalanced by grounding the non-phase signal, allowing you to feed both 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.

Sonifex RB-SM2 Specifications

Audio Specification

  • Maximum Input Level: +28dBu
  • Maximum Output Level: +28dBu
  • Input Impedance: >20kΩ balanced bridging
  • Output Impedance: <50Ω balanced
  • Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
  • Gain Range: Adjust -8dB to +18dB gain, ref. 0dB input on L and R
  • Common Mode Rejection: >66dB typically
  • Distortion: 0.01% THD @ 1kHz, ref +8dBu output
  • Noise: -100dB, unity gain, ref +8dBu output   


  • Inputs: 4 x XLR 3 pin female (Balanced, can be unbalanced)
  • Outputs: 2 x XLR 3 pin male (Balanced, can be 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:
    • 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
    • 11” (W) x 4.3” (D) x 1.7” (H) (1U)
  • Weight:
    • Nett: 1.05kg Gross: 1.50kg
    • Nett: 2.3lbs Gross: 3.3lbs
Manufacturer Sonifex
Model Sonifex RB-SM2 Used
Sonifex RB-SM2 Used
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