Radial Engineering JDX User Manual

®

True to the Music

JDX

Amplifi er Direct Box

User Guide

CAUTION: Please read safety disclosure
statement on the inside cover before
connecting your Radial JDX.

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5
Tel: [phone] Fax: [phone]
email: [e-mail]

www.radialeng.com

SAFETY DISCLOSURE STATEMENT

CAUTION:

Please read before

connecting your Radial JDX

THE JDX IS NOT A LOAD BOX

It is mandatory that your amplifi er be connected to a
loudspeaker or load box at all times. The JDX does not
provide a signifi cant resistive load for an amplifi er to
safely operate. Damage may occur to your amp if the
JDX is used without a proper loudspeaker load.

ALWAYS TURN YOUR AMPLIFIER OFF BEFORE
CONNECTING OR DISCONNECTING THE JDX.

It is your responsibility to confi rm the JDX is connected
properly before operating your amplifi er. If you are
unsure about connecting or operating the JDX consult
a qualifi ed technician or see your dealer. Damage
caused by improper operation is not covered under the
warranty. See the back cover for warranty details.

www.radialeng.com

True to the Music

Radial JDX Amplifi er Direct Box

Users Guide

Table of Contents Page

Introduction ...................................................................1

Design Concept ............................................................2

Applications ..................................................................5

Feature Set ...................................................................6

Input Panel ...................................................................7

Output Panel ................................................................7

Making Connections .....................................................8

FAQ ..............................................................................8

Specifi cations ...............................................................9

Warranty ................................................................Back Cover

Congratulations on your purchase of the Radial JDX guitar amp
direct box, a unique tool for recording and performing with ampli­fi ed electric guitar. The JDX is an active speaker-level DI that taps
the natural tone of your amplifi er and interfaces it with professional
recording and PA systems.

The Radial JDX is easy to use, however it differs signifi cantly from
standard direct boxes. Like any tool, the best way to get the most
out of your JDX is by understanding the design, functions and
safety features. We recommend you take a few minutes to read
this manual before operating your JDX.

Should you have any questions regarding the JDX or it’s functions
check our FAQ at www.radialeng.com. If you would like to share
your experience with Radial products we invite you to contact us
at [e-mail].

The JDX, one small step for mankind, one huge leap for tone
fanatics!

Radial Engineering

JDX User Guide

1

True to the Music

DESIGN CONCEPT

The JDX differs from a standard DI like the Radial J48. A stan­dard DI taps the output of the guitar before it is connected to an
amplifi er. The JDX taps the output of your amplifi er yielding a
completely different sound.

The JDX is placed between the amplifi er and loudspeaker. A pro-
prietary reactive circuit follows the constantly changing interaction
between amp and speaker to capture the dynamic response of
your amp. Then an active multi-stage fi lter processes the signal to
emulate the frequency response of a loudspeaker and fi nally, the
JDX uses a Class-A buffering amplifi er to output a signal suitable
for pro-recording and and PA systems.

JDX Amplifi er Direct Box vs. Standard Direct Box

JDX Amplifi er DI J48 Standard DI

Bass and acoustic guitars often use a standard DI to capture the
clean sound of the instrument. This works because these instru­ments almost always use an unprocessed sound and the PA
system merely amplifi es the levels of the direct signal.

Electric guitars generally don’t use standard DIs because the am­plifi er and loudspeaker play an important part in a player’s sound.
Typically a microphone is used to capture the amplifi ed guitar
sound. This raises several other variables such as bleed, place­ment and acoustics that come along with using microphones.

The Radial JDX offers an easy solution by eliminating the mi­crophone and delivering the sound of a player’s amp directly
to the recording or PA console. By removing the variables of a
microphone the consistency of the sound from night to night is
improved. This is a boon to in-ear monitor users. When listening
through in-ear monitors subtle differences in mic placement and
room acoustics can translate into huge changes in tone. The JDX
provides great sound while eliminating bleed from other instru­ments, like drums, from leaking into the guitar mix.

Radial Engineering

Mixing Console

JDX User Guide

2