Sonifex Dual Microphone Amplifier - RB-MA2
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 processing equipment.
Sonifex Dual Microphone Amplifier - RB-MA2
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.
RB-MA2 Block Diagram.
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 |
| Distortion: | 0.01% THD @ 1kHz, ref +8dBu output |
| Phantom Power: | 48V |
Connections |
|
| Input: | 1 x XLR 3 pin female (Balanced) |
| Output: | 1 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) |
Equipment Type |
|
| RB-MA1: | Single microphone amplifier |
Physical Specification |
|
| Dimensions (Raw): | 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U) 11” (W) x 4.3” (D) x 1.7” (H) (1U) |
| Dimensions (Boxed): | 36cm (W) x 20.5cm (D) x 6cm (H) 14.2” (W) x 8” (D) x 2.4” (H) |
| Weight: | Nett: 0.90kg Gross: 1.35kg Nett: 2lbs Gross: 3lbs |