Radial Engineering JDI User Guide
R a d i a l S m a r t S h e e t
Order No. R800 1010
J D I™ P A S S I V E D I R E C T B OX
The Radial JDI direct box is the world’s fi nest passive DI. The JDI has been optimized to
handle extreme transients without introducing distortion or coloration to the sound.
Because of the transformer, the JDI provides 100% isolation between the instrument input
side and the balanced output, eliminating hum and buzz caused by ground loops. Ground
loops are most prevalent when interfacing equipment with AC power such as keyboards and
guitar amplifi ers. Most passive DIs sound terrible because they use inexpensive iron or steel
core transformers. This causes phase shift at various frequencies known as group delay,
which has the effect of making bass sound indistinct and lack punch and causes mid-range
to smear. This makes mixing more diffi cult.
The Radial JDI employs a Jensen transformer with a nickel-laminated core. Nickel does not
retain a memory or polarity. This has the net effect of reducing phase distortion, improving
linearity and lowering harmonic distortion. Fix the problems; you get great sound.
The Radial JDI does not require 48V phantom-power or a battery. You just plug in and play.
The JDI is also available in stereo (Radial JDI Duplex) and in 6 channels (Radial JD6) or
may be rackmounted using the Radial J-Rak for up to 8 units in 2 RUs.
Features
• Best-sounding passive DI in the world
• Authentic Jensen transformer
• Linear from 10Hz ~ 40kHz
• Extraordinary level handling without distortion
• Built to survive the road
Applications
• Ideal for acoustic guitars and basses
• Keyboards, modules and electronic drums
• Great with high-output, electronic instruments
• Eliminates hum & buzz in sound systems
Cool Factors
• ‘Plug-&-play’ easy-to-use!
• No battery or phantom-power required
• Impossible to overload!
• Up to 8 may be rack-mounted with the J-Rak
• 3 year transferable warranty
-15dB PAD allows super-hot inputs
such as from a CD player to be
connected.
MERGE FUNCTION turns the input
and thru jacks into a passive mixer
to sum stereo signals to mono. This
saves valuable inputs on the mixer!
INPUT and THRU jacks connect
from the instrument and to the
instrument amplifi er.
FULL BOTTOM PAD improves
electrical isolation and keeps the JDI
from moving around on busy stages!
XLR balanced 600Ω mic-level
output for runs to 1000 feet without
appreciable noise.
BOOK-END DESIGN creates a
protective zone around the jacks
and switches.
PARALLEL SPEAKER interface
option introduces a second -30dB
pad with band-pass fi lter to emulate
a 12” guitar speaker.
GROUND LIFT disconnects the
ground path to the transformer at the
XLR output.
POLARITY REVERSE fl ips the
polarity from pin-2 to pin-3 on the XLR.
Main Competition
The primary competition for the Radial JDI comes from
Countryman and BSS. These DI’s show signifi cantly more
harmonic distortion, are not as linear throughout the audio
range and introduce serious phase distortion. Once the sound
is distorted, you cannot fi x it in the mix!
Specifi cations Radial JDI Countryman BSS
Harmonic Distortion at 20Hz 0.06% 0.30% 0.70%
Linearity 20Hz ~ 20kHz +/- 0.2dB +/- 2.0dB +/- 1.0dB
Phase distortion at 20Hz 4.3º 19.8º 38.5º
R a d i a l E n g i n e e r i n g L t d . · T el: 604-942-1001 · Fax: 604-942-1010 · www. r ad i a l e n g . c o m · e m a i l i n f o @ r a d i a l e n g . c o m
R a d i a l S m a r t S h e e t © 2 0 0 6 S u b j e c t t o c h a n g e w i t h o u t n o t i c e .
JENSEN nickel core transformer
for distortion-free signal transfer
and 100% isolation.
14-GAUGE STEEL welded I-beam
enclosure makes it impossible to torque
the PC board. Eliminates cold solder
joints.
MU-METAL SHIELD for protection
against radio frequency and electromagnet interference.
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