Radial ProDI Top View
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  • Radial ProDI and Terry Lawless
    Terry Lawless

    "Once you hear the difference between a Radial DI and the others, you'll never go back!"

    Terry Lawless
    (Keyboards and Programming - U2)
    Terry Lawless
  • Radial ProDI and Jim Warren
    Jim Warren

    "I've used Radial on all my major touring projects with great success. They sound fantastic and are built to last."

    Jim Warren
    (Radiohead, Arcade Fire, Nine Inch Nails)
    Jim Warren
  • Radial ProDI and Joey DeFrancesco
    Dave LaRue

    "My Radial DI's have become a staple in my studio and in my live rig. They sound great and I love the versatility they afford me in any situation."

    Dave LaRue
    (Dixie Dregs, Joe Satriani, Deep Purple, Eric Johnson)
    Dave LaRue
  • ProDI - Alan Parsons
    ProDI - Alan Parsons

    "Our lives changed when we started carrying our own Radial DI's on the road. We use the ProDI, ProD2 and the JDI on bass. Our Radial Direct Boxes are rugged, reliable, and sound great - so much better than the competition - in fact there is no competition!"

    Alan Parsons
    (The Beatles, Pink Floyd, Al Stewart,
    Alan Parsons Project)
    Alan Parsons
Radial PrdDI Passive Direct Box

ProDI™ Passive Direct Box

Part No. R800 1100

  • Compact passive direct box for stage and studio
  • Able to handle huge transients without distortion
  • Transformer isolation eliminates noisy ground loops
  • Plug and play easy to use feature set - on stage or in the studio

The Radial ProDI is a passive direct box that combines exceptional audio performance with solid dependable construction, making it the ideal general duty direct box for stage and studio.

The heart of the ProDI is a custom wound Radial transformer. It features an exceptionally high 140kΩ input impedance to reduce loading while enabling the ProDI to handle extreme signal levels at all frequencies without distortion. This is further improved upon with an internal MuMETAL® shield to protect against electromagnetic fields that can cause unshielded transformers to distort.

This compact direct box begins with 14-gauge steel I-beam skeleton for added rigidity and Radial's unique book-end design that creates a protective zone around switches and connectors. Glass filled nylon connectors and high cycle switches combine with the mil-spec PCB and internal RF filtering to provide durability and noise-free performance. A full bottom no-slip pad provides both mechanical isolation and electrical insulation to further protect against the rigors of professional touring.

The ProDI is ideally suited for instruments such as bass guitar, active acoustics, keyboards and just about anything else! When you consider all of the features and the affordable price tag, it is no wonder the Radial ProDI has become one of the most popular direct boxes ever made.

The Radial ProDI… Spectacular performance at a price that anyone can afford!


Active Direct Box


Studio Reamper


Flange Mount Adaptors

ProDI - Applications
Using the Radial ProDI with Electric Bass
ProDI with electric bass

The ProDI works great for high output devices like active bass guitars. It is able to handle the huge signal levels from active pickups without distortion and the transformer isolation pevents ground loop hum. The ProDI sends the pure sound of the bass to the PA and to the player's amp.

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Using the Radial ProDI with Acoustic Guitar
ProDI with acoustic guitar

Acoustic guitars can sometimes have sharp sounding active preamps. The ProDI naturally smoothes out the transients for a warmer tone. And because the ProDI is able to handle loud signals from active pickups, it will not distort. This makes it a great direct box for acoustic guitars.

Using the Radial ProDI with a Keyboard
ProDI with a Keyboard

Today's digital keyboards are not only very dynamic, they also have a tremendous range from low to high notes. The ProDI is able to withstand excessive signal levels at all frequencies without introducing distortion or phase shift so all your patches sound great.