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Sonifex RB-SL2 Twin Mono or Stereo, Limiter
The RBSL2
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The RB-SL2 is a stereo, or twin independent mono, VCA limiter for use in news-rooms and other locations where the correct level into recording equipment is required, but not necessarily under the control of an engineer, for example, for overload protection. It can also be used as an inexpensive main output limiter for small scale radio stations, hospital radio and student radio.

The XLR-3 electronically balanced inputs and outputs can be wired unbalanced to accept an output from domestic equipment.

For each channel there is an input gain and a threshold level control. With the limit threshold set to maximum, the input through to output can be normalised using the input potentiometers. Once the unit is acting as a buffer with gain/attenuation, the limit threshold level can be set, with the recovery adjusted for the application. The power LED indicates limiting by flashing.

The rear panel mode switch changes the unit from dual mono to stereo, when only the pre-sets for channel 1 (left) are active and apply to both channels. Stereo limiting operates by limiting both left and right outputs if either left or right input needs to be limited. Dual mono limiting operates by limiting left and right signals individually, so you can use the RB-SL2 as two separate mono limiters.

  Audio Specification
Maximum Input Level+28dBu
Maximum Output Level+28dBu
Input GainAdjustable -8dB to +18dB gain
Limit ThresholdAdjustable -8dBu to +28dBu gain
Frequency Response20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Noise-100dB unity gain ref +8dBu
Distortion0.01% THD @ 1kHz, ref +8dBu output, threshold set at +10dBu
Common Mode Rejection>66dB typically
Input Impedance>20kohm balanced bridging
Output Impedance<50 ohm
  Connections
Inputs2 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: 1.0kg
Gross: 1.45kg
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-SL2 UKTwin mono, or stereo limiter, 230V (UK 3 pin to IEC)UK
RB-SL2 EUTwin mono, or stereo limiter, 230V (European Schuko 2 pin to IEC)EU
RB-SL2 USTwin mono, or stereo limiter, 115V (USA 3 pin to IEC)US
RB-SL2 AUTwin mono, or stereo limiter, 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