Radial Engineering ProDI – Passive Direct Box for High-Output Instruments

The Radial Engineering ProDI is a premium passive DI box designed to deliver clean, distortion-free sound even with powerful high-output instruments. Its custom-wound transformer and rugged steel construction make it a trusted tool for live sound, studio recording, and touring musicians who demand reliable, noise-free performance. Compact yet extremely durable, the ProDI ensures accurate signal translation with minimal coloration.

Key Features

• Custom-wound transformer: Handles hot instrument signals without distortion or saturation.
• Wide frequency response: Linear from 20 Hz to 18.5 kHz for full-range musical accuracy.
• -15 dB pad: Prevents clipping with high-output instruments and active electronics.
• Ground lift switch: Eliminates hum and buzz caused by ground loops.
• Touring-grade housing: 14-gauge steel I-beam chassis prevents PCB stress and damage.
• No-slip pad: Protects against shock and keeps the DI securely in place on stage.

Customer Benefits

The ProDI delivers clean, dependable performance in any environment. Its transformer-based design naturally tames harsh frequencies, making it ideal for keyboards, bass guitars, acoustic guitars with active electronics, and other high-output sources. Musicians and engineers benefit from Radial’s legendary durability and noise-free signal handling.

Quick Specs

• Type: Passive DI box (single channel)
• Transformer: Custom Radial transformer
• Frequency Response: 20 Hz – 18.5 kHz
• Pad: -15 dB
• Ground Lift: Yes
• Construction: 14-gauge steel, I-beam chassis with no-slip pad
• Outputs: Balanced XLR
• Inputs: 1/4" instrument input + 1/4" thru output

What’s in the Box

• Radial Engineering ProDI
• User documentation

Use Cases / Ideal For

Live sound, studio recording, keyboards, bass guitars, acoustic guitars with active pickups, electronic instruments, and AV installations.

Compatibility

Works with any mixer, audio interface, stage box, or PA system using standard XLR and 1/4" connections.

Pros & Cons

✅ Pros:

• Handles high-output signals without distortion
• Transformer isolation removes hum and buzz
• Extremely rugged and touring-ready
• No power or batteries required

⚠️ Cons:

• Not ideal for very low-output passive instruments (active DI recommended)

The Radial ProDI is a rock-solid passive DI built for musicians and engineers who need clean, reliable performance every time—available now at Soundium.