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Sonifex RB-MA2 Dual Microphone Amplifier
The RBMA2
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The RB-MA2 consists of two independent low-noise microphone pre-amplifiers for converting mic level signals to line level, or for driving long lines from microphones to mixing equipment.

All connections and controls are on the rear panel. The microphone inputs are XLR-3 type and are electronically balanced. The input gain for each input can be adjusted individually by a recessed pre-set potentiometer which allows for the use of both dynamic and powered microphones.

The XLR-3 line outputs are electronically balanced and can be wired unbalanced by grounding the non-phase signal, allowing you to feed both balanced and unbalanced equipment.

For each channel there are independent switches to control a high pass filter (low frequency roll-off at 125Hz) and to provide phantom power at +48V to the connected microphones.

  Audio Specification
Maximum Input Level-10dBu
Maximum Output Level+28dBu
Frequency Response20Hz to 20kHz +/- 0.1dB (600 ohm load, ref 1kHz)
Low Frequency Roll-Off125Hz @ 6dB/octave
Gain RangeAdjustable 36dB to 75dB gain (adjust for each input)
Common Mode Rejection>60dB typically
E.I.N.130dB
Input Impedance2kohm nominal balanced
Output Impedance<50ohm
Distortion0.01% THD @ 1kHz, ref +8dBu output
Phantom Power48V
  Connections
Inputs2 x XLR 3 pin female (balanced)
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-MA2 UKDual Microphone Amplifier, 230V (UK 3 pin to IEC)UK
RB-MA2 EUDual Microphone Amplifier, 230V (European Schuko 2 pin to IEC)EU
RB-MA2 USDual Microphone Amplifier, 115V (USA 3 pin to IEC)US
RB-MA2 AUDual Microphone Amplifier, 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


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Tel: +44 (0)1933 650700 Fax: +44 (0)1933 650726 EMail: sales@sonifex.co.uk