Skip to content

Radial Engineering Pro48 Active DI – Direct Injection Box Pro48

Pro48 Active DI – Direct Injection Box

SKU: Pro48 Categories: , , Tags: , , , , , , , , ,


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.

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 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.



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



• 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



Rack mount kits


Back to Home Page

View on manufacturers site:


Weight .635 kg
Dimensions 15.9 × 10.8 × 7.6 cm