Sonifex RB-SM2 Dual Stereo to Mono Converter


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  • The 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.

  • Maximum Input Level+28dBu
    Maximum Output Level+28dBu
    Input Impedance>20kΩ balanced bridging
    Output Impedance<50Ω balanced
    Frequency Response20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
    Gain RangeAdjust -8dB to +18dB gain, ref. 0dB input on L and R
    Common Mode Rejection>66dB typically
    Distortion0.01% THD @ 1kHz, ref +8dBu output
    Noise-100dB, unity gain, ref +8dBu output
    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
    Fuse RatingAnti-surge fuse 100mA 20 x 5mm (230VAC)
    Anti-surge fuse 250mA 20 x 5mm (115VAC)
    Equipment Type
    RB-SM2Dual stereo to mono converter
    Physical Specification
    Dimensions (Raw)28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
    11” (W) x 4.3” (D) x 1.7” (H) (1U)
    Dimensions (Boxed)36cm (W) x 20.5cm (D) x 6cm (H)
    14.2” (W) x 8” (D) x 2.4” (H)
    WeightNett: 1.05kg Gross: 1.50kg
    Nett: 2.3lbs Gross: 3.3lbs
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