Radial Engineering JDI User Manual

Radial± Smart Sheet

JDI± p a s s i v e d i r e c t b ox

JDI Order No. R800 1010 00

Features

• Jensen transformer equipped passive DI

• Eliminates hum and buzz from ground loops

• Virtually zero phase & harmonic distortion

• Extraordinary signal handling and noise rejection

Applications

• Great with high-output electronic instruments

• Ideal for acoustic guitars & active basses

• Merge stereo keyboards to mono

• Perfect for live performance & studio recording

The Radial JDI™ is the world’s nest passive direct box. It features a premium Jensen

transformer to isolate the signal and reject noise while at the same time boasting an extremely
wide frequency response and virtually zero distortion of all types.

The heart of any passive DI is the audio transformer, which determines the frequency response
and distortion characteristics of the direct box, and imparts character on the signal when

saturated. The JDI employs a Jensen JT-DB-EPC audio transformer to produce a ruler-at

frequency response from 10Hz up to 40kHz, while minimizing phase and harmonic distortion
and isolating the signal to prevent hum and buzz from ground loops. When connected to high­output sources such as active basses or electronic instruments, the JDI transformer saturates
instead of clipping, producing a warm sounding bessel curve that emulates some of the most
sought-after vintage equipment.

Built with 14 gauge steel to handle the harshest touring environment, the JDI is the perfect
choice when signal quality is critical, delivering only the natural, pure sound of your instrument
on a live stage or in the recording studio.

-15dB PAD reduces input sensitivity
for active high-output instruments.

MERGE FUNCTION turns the input
and thru jacks into a passive mixer
to sum stereo signals to mono and
save valuable inputs on the mixer.

INPUT connects to the instrument,
THRU feeds the amplier.

FULL BOTTOM PAD improves

electrical isolation and keeps the JDI
from moving around on busy stages.

Cool Stuff

• Build tough to survive the road

• Passive operation, no power required

• Impossible to overload

• 3 year transferable warranty

JENSEN EQUIPPED nickel core
transformer provides distortion-free
signal transfer and 100% isolation.

Using the JDI with Electric Bass

The JDI is often selected for high output bass
guitars, as it is able to handle huge signal levels
without distortion or signal degradation. On stage
it sends the pure sound of the bass to the PA with
minimal loading. In the studio, it is perfect for
recording direct.

Using the JDI with Acoustic Guitar

Most acoustic guitars have built-in preamps
that can produce harsh-sounding peaks. The
JDI naturally smoothes out these transients for
a warmer tone, and because the JDI is able to
handle hot output levels it will not distort.

XLR balanced, mic-level output
used to feed a mixer or a mic
preamp.

BOOK-END DESIGN creates a
protective zone around the jacks
and switches.

PARALLEL SPEAKER interface
option introduces a second -30dB

pad with band-pass lter to emulate

a 12” guitar speaker.

GROUND LIFT disconnects pin-1 at
the XLR output to help eliminate hum
and buzz from ground loops.

POLARITY reverses pins 2 and 3 at
the XLR output.

Using the JDI with Keyboards

Today’s digital keyboards are not only very
dynamic, they also have a tremendously
wide frequency response. The JDI is able
to withstand excessive signal levels at all
frequencies without introducing distortion or
phase shift.

Radial Engineering Ltd. • © Copyright 2018 all rights reserved • www.radialeng.com • email [e-mail] • Subject to change without notice • Made in Canada