Dual Microphone Amplifier with Gain Controls
The Sonifex RB-MA2G consists of two independent low-noise microphone pre-amplifiers with front panel level controls and metering, for converting microphone level signals to line level, or for driving long lines from microphones to mixing equipment.
All connections are on the rear panel. The microphone input is XLR-3 type and is electronically balanced. The input gains can be adjusted individually by recessed pre-set potentiometers.
Two front panel potentiometers give ±12dB level adjustment and a 12 segment LED meter shows the audio level for each channel.
The XLR-3 line output is 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 microphone. An LED power indicator on the front panel displays the power supply connection.
- Neutrik XLR connectors.
- Mic input gain adjustment.
- +48V phantom power.
- High pass (rumble) filter.
- Front panel level adjustment.
- Front panel LED metering.
|Maximum Input Level:||+4dBu|
|Maximum Output Level:||+28dBu|
|Input Impedance:||2kΩ Nominal balanced|
|Output Impedance:||<50Ω Balanced|
|Low Frequency Roll-Off:||125Hz @ 6dB/octave|
|Gain Range:||Adjustable 12dB to 80dB gain|
|E.I.N:||-128dBu, 20kHz BW, max gain, Rs=200Ω|
|Distortion:||<0.01%, +8dBu, 20Hz – 20kHz, 40dB gain, 20kHz bandwidth|
|Common Mode Rejection:||>66dB @ 1kHz|
|Frequency Response:||20Hz to 20kHz +0/-0.2dB|
|Input:||2 x XLR 3 pin female (Balanced)|
|Output:||2 x XLR 3 pin male (Balanced, can be unbalanced)|
|Mains Input:||Filtered IEC, 110V-120V, or 220-240V switchable, fused, 9W maximum|
|Fuse Rating:||Anti-surge fuse 100mA 20 x 5mm (230VAC) Anti-surge fuse 250mA 20 x 5mm (115VAC)|
|RB-MA2G:||Dual microphone amplifier with gain|
|Dimensions (Raw):||48cm (W) x 10.8cm (D) x 4.2cm (H) (1U) 19” (W) x 4.3” (D) x 1.7” (H) (1U)|
|Dimensions (Boxed):||58.5cm (W) x 22.5cm (D) x 7cm (H) 23” (W) x 8.9” (D) x 2.8” (H)|
|Weight:||Nett: 1.35kg Gross: 2.0kg Nett: 3.0lbs Gross: 4.4lbs|
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