Sonifex RB-MA2G
Dual Microphone Amplifier with Gain Controls
The 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.
Category: Microphone Amplifiers & Limiters.
Product Function: Amplification of two mic level signals to line level.
Typical Applications: To amplify additional microphones in a studio talks area, courtroom microphone amplification, converting mic signal where mic and amp are a long distance apart.
Features:
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- Neutrik XLR connectors.
- Mic input gain adjustment.
- +48V phantom power.
- High pass (rumble) filter.
- Front panel level adjustment.
- Front panel LED metering.
RB-MA2G Block Diagram.
Technical Specification For RB-MA2G |
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Audio Specifications |
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| Maximum Input Level: | +4dBu |
| Maximum Output Level: | +28dBu |
| Input Impedance: | 2 kΩ Nominal balanced |
| Output Impedance: | <50 Ω 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 |
| Phantom Power: | 48V |
| Frequency Response: | 20Hz to 20kHz +0/-0.2dB |
Connections |
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| 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 × 5 mm (230VAC) Anti-surge fuse 250mA 20 × 5 mm (115VAC) |
Equipment Type |
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| RB-MA2G: | Dual microphone amplifier with gain |
Physical Specifications |
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| Dimensions (Raw): | 48 cm (W) x 10.8 cm (D) x 4.2 cm (H) (1U) 19” (W) x 4.3” (D) x 1.7” (H) (1U) |
| Dimensions (Boxed): | 58.5 cm (W) x 22.5 cm (D) x 7 cm (H) 23” (W) x 8.9” (D) x 2.8” (H) |
| Weight: | Nett: 1.35 kg Gross: 2.0 kg Nett: 3.0lbs Gross: 4.4lbs |
