Sonifex RB-SM1 Stereo to Mono Converter

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£359.94 £299.95
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Product Information

Sonifex RB-SM1 Stereo to Mono Converter

The RB-SM1 consists of a converter which will produce a fully buffered and balanced mono line output from a single stereo input. 

All connections are on the rear panel of the unit. The XLR-3 input is electronically balanced with an impedance of 20kohm bridging.

It can be wired unbalanced to accept an output from domestic equipment.

The XLR-3 line output is electronically balanced with an output impedance of Output gain adjustment using pre-set potentiometers allows a normalised mono output from domestic stereo equipment.

The potentiometers are accessible through the rear panel.

The Sonifex Redbox SM1 can be rackmounted for studio use or to be fitted to an OB truck.

  • Produces a balanced mono line output
  • Compact & Lightweight Unit
  • Rack mountable



Maximum Input Level+28dBu
Maximum Output Level+28dBu
Frequency Response20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Gain Range Adjustable-8dB to +18dB gain, ref. 0dBu in on L and R
Common Mode Rejection>66dB typically
Distortion THD1kHz +8dBu 0.01%
Noise-100dB unity gain ref +8dBu
Input Impedance>20kohm balanced bridging
Inputs2 x XLR 3 pin female (balanced, can be unbalanced)
Outputs1 x XLR 3 pin male (balanced, can be unbalanced)
Mains InputFiltered IEC, switchable 110-120V, or 220-240V, fused, 6W max
Net Weight1.0kg
Gross Weight1.45kg
Dimensions (Raw)28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed)36cm (W) x 20.5cm (D) x 6cm (H)