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Radial Engineering ProDI Passive Direct Boxplay button

Radial Engineering ProDI Passive Direct Box

 How to Choose a DI: Active vs. Passiveplay button

How to Choose a DI: Active vs. Passive

Radial Engineering

collapse expand iconDescription

The Radial Engineering ProDI is a high-performance passive direct box that delivers pure, noise-free signal for live and recording applications. The ProDI employs a custom-made transformer to convert instrument impedance, eliminating ground loops and ensuring the highest quality signal transfer. Linear frequency response from 20Hz to 18kHz means zero coloration of your tone. Simply plug in your instrument via the 1/4" input and thru jacks and send a balanced signal to the mixer or interface via the XLR output.

Premium Components for Unparalleled Performance

At the heart of the ProDI is a custom-made transformer, crafted to Radial's exacting standards. The transformer provides galvanic isolation, eliminating hum and buzz from ground loops. It also converts the high-impedance signal from an instrument to the low-impedance balanced signal needed for long cable runs. The result is a clean, clear signal free of noise and interference.

Built for the Rigors of the Road

Like all Radial products, the ProDI is built to withstand the challenges of live performance and touring. The 14-gauge steel chassis protects the sensitive internal components. An outdoor-rated, baked enamel finish resists scratches and corrosion. Input and thru jacks are recessed to prevent damage. A -15dB pad switch allows use of the DI with a wide range of instruments. A ground lift switch helps eliminate stubborn ground loops when needed.

Simple Yet Versatile Solution

With a single XLR output, the ProDI keeps things simple while providing maximum versatility. Use it with bass, acoustic guitar, electric guitar, keyboards, drum machines or any other instrument with a 1/4" output. The ProDI's balanced low-impedance signal means long cable runs without noise or signal degradation. An affordable, road-ready solution for high-quality DI, the ProDI delivers Radial's signature no-compromise performance and reliability.

collapse expand iconFeatures

  • Passive direct box
  • Proprietary transformer for impedance conversion and isolation
  • Linear from 20Hz-18kHz
  • Low distortion and zero phase distortion
  • XLR input
  • 1/4" thru/input
  • -15dB pad
  • Ground lift
  • Protective front panel
  • Heavy-duty construction
  • Baked enamel finish
  • 600 ohm balanced output
  • 2-1/2" x 4-1/4"

WARNING: This product can expose you to chemicals including Titanium dioxide (airborne, unbound particles of respirable size), which is known to the State of California to cause cancer, and Lead, which is known to cause birth defects or other reproductive harm. For more information go to

collapse expand iconWarranty

90 day warranty on footswitch and tubes. One year warranty on all other products.

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