Sonifex RB-MA2 Dual Microphone Amplifier (used)

Sonifex RB-MA2 Dual Microphone Amplifier - Used

The Sonifex 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 processing equipment.

This is a used item. The unit is in good condition with some signs of use. Please see images.

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.

Sonifex RB-MA2 Specifications

Audio Specification

• Maximum Input Level: -10dBu
• Maximum Output Level: +28dBu
• Low Frequency Roll-Off: 125Hz @ 6dB/octave
• E.I.N.: 130dB
• Common Mode Rejection: >60dB typically
• Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
• Input Impedance: 2kΩ nominal balanced
• Output Impedance: <50Ω
• Gain Range: Adjustable 36dB to 75dB gain (each input)
• Distortion: 0.01% THD @ 1kHz, ref +8dBu output
• Phantom Power: 48V   

Connections

• Input: 2 x XLR 3 pin female (Balanced)
• Output: 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: 1.00kg Gross: 1.45kg
  • Nett: 2.2lbs Gross: 3.2lbs