sonifex rb da4x5 1

The Sonifex RB-DA4x5 is a 1U rack-mount combined distribution amplifier and mixer. It has 4 mono analogue audio inputs on female XLR and 4 groups of 5 outputs on 15 way D-type connectors. Each output group has a five-way front-panel DIP switch assigned to it which is used to select the input(s) to send to the output group. This enables each of the four inputs, or a 1kHz 0dBu tone, to be mixed to the output group.

  • 4 input, 20 output distribution amplifier.
  • Audio presence LED’s for inputs or outputs.
  • Balanced I/O that can be wired unbalanced.
  • Outputs a 1kHz test tone e.g to check transmission lines.

The inputs and outputs are electronically balanced and can be wired unbalanced. Each input has adjustable gain using a pre-set potentiometer, providing a gain range of -8dB to +18dB. Each output is individually buffered so that a short circuit on one output won’t affect the others. The output gain of each group can similarly be adjusted between -8dB and +18dB using pre-set potentiometers.

The DIP switch settings and gain controls are recessed beneath a front-mounting screw-on cover so that settings can not be accidentally altered, for secure applications.

Four bright front-panel signal present LEDs show the levels of either the inputs or the output groups by pressing the AUDIO PRESENCE button. The LEDs will show green illumination from -12db through to 0db, amber from 0db through to +6db and red for inputs and outputs at +6db and over.

RB-DA4x5 Diagram

RB-BDA4x5 Block Diagram.

Audio Specification

Maximum Input Level:+28dBu
Maximum Output Level:+28dBu
Frequency Response:20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Input Gain Range:Adjustable 8dB loss to 18dB gain (channel 1-4 adjust)
Output Gain Range:Adjustable 8dB loss to 18dB gain (group 1-4 adjust)
Input impedance:>20kΩ bridging
Output impedance:<50Ω
Distortion:0.01% THD @ 1kHz, ref +8dBu output
Noise:-100dB unity gain, ref +8dBu output
Common Mode Rejection:>66dB typically


Inputs (4 x Mono):4 x XLR 3 pin female (balanced, can be unbalanced)
Outputs (20 x Mono):4 x 15-way D-type male plug (balanced, can be unbalanced)
Mains Input:Filtered IEC, switchable 110-120V, or 220-240V, fused, 9W max
Fuse Rating:Anti-surge fuse 100mA 20 x 5mm (230VAC) Anti-surge fuse 250mA 20 x 5mm (115VAC)

Equipment Type

RB-DA4x5:4 Input, 4 x 5 output distribution amplifier/mixer

Physical Specification

Dimensions (Raw):48cm (W) x 15.8cm (D*) x 4.2cm (H) (1U) 19” (W) x 6.2” (D*) x 1.7 (H) (1U)
Dimensions (Boxed):59cm (W) x 27.5cm (D*) x 11cm (H) 23.2” (W) x 10.8” (D*) x 4.3” (H)
Weight:Nett: 1.6kg  Gross: 2.2kg Nett: 3.5lbs Gross: 4.8lbs
* Note that this product is deeper than standard Red boxes
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Sonifex RB-DA4x5


Tech Support

2-Year Warranty


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STUDIO Sonifex RB-DA4x5