SONIFEX Talkback TB-6D
February 25, 2020
February 25, 2020
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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.

RB-MA1 Diagram

RB-MA1 Block Diagram.

See larger image >

Technical Specification For RB-MA1

Audio Specification

Maximum Input Level:-10dBu
Maximum Output Level:+28dBu
Low Frequency Roll-Off:125Hz @ 6dB/octave
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


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
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