Radial Pro48

Active Direct Box


The Pro48 is an active direct box designed for use on stage or in-home recording studios, with exceptional signal handling for use with both active and passive instruments.

  • High performance active direct box
  • Increased dynamic range and headroom
  • 48V phantom powered with switching supply
  • Ideal for acoustic guitar and bass

Exceptional sonic performance

The Pro48’s innovative internal switching power supply significantly increases headroom producing less distortion while yielding a smooth, linear response that extends from 20Hz to well above 40kHz. This results in a natural, uncolored signal that is as good or better than DI boxes costing several times more. The superior performance makes the Pro48 an ideal candidate for use with battery-powered active basses and acoustic guitars that tend to overload other direct boxes.

Audio circuit type:Proprietary analog circuit with low-noise op-amp
Frequency response:20Hz ~ 20kHz (± 1.5 dB
Dynamic range:99dB
Total harmonic distortion:0.001% @ 0 dBu
Intermodulation Distortion:0.002% @ 0 dBu
Phase Deviation:+28º at 20Hz | +1º at 1kHz | -2º at 20kHz
Input Impedance:220kΩ – ¼” input
Output Impedance:600Ω – XLR output
Equivalent Input Noise:-86dBu
Noise:-82dB below 0dBu
Maximum Input:+9dBu
Input pad, Ground lift
Construction:14-gauge steel
Size (L x W x D):4.25″ x 2.75″ x 1.75″ (108 x 70 x 44mm)
Weight:1.2 lb (0.54kg)
Power:48V phantom – proprietary digital switching
Conditions:For use in dry locations only between 5°C and 40°C
Warranty:Radial 3-year, transferable


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