Single Microphone Amplifier
The Sonifex RB-MA1 consists of a low noise microphone pre-amplifier for converting mic level signals to line level, or for driving long lines from microphones to mixing equipment.
The connections and controls are on the rear panel. The microphone input is an XLR-3 type and is electronically balanced. The gain for the input can be adjusted by a recessed pre-set potentiometer which allows for the use of both dynamic and powered microphones.
The line output is of an XLR-3 type and is electronically balanced. It can be wired unbalanced by grounding the non-phase signal, allowing you to feed both balanced and unbalanced equipment.
There is a switch to control a high pass filter (low frequency roll-off at 125Hz) and to provide phantom power at +48V to the connected microphone.
Audio SpecificationMaximum Input Level:-10dBuMaximum Output Level:+28dBuLow Frequency Roll-Off:125Hz @ 6dB/octaveE.I.N.:130dBCommon Mode Rejection:>60dB typicallyFrequency Response:20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz) Input Impedance:2kΩ nominal balancedOutput Impedance:<50ΩGain Range:Adjustable 36dB to 75dB gainDistortion:0.01% THD @ 1kHz, ref +8dBu outputPhantom Power:48V
ConnectionsInput: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 maxFuse Rating:Anti-surge fuse 100mA 20 x 5mm (230VAC) Anti-surge fuse 250mA 20 x 5mm (115VAC)
Equipment TypeRB-MA1:Single microphone amplifier
Physical SpecificationDimensions (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
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