Radial Engineering JDX-48 User's Guide

JDX 48

Amplier Direct Box

User Guide

CAUTION: Please read safety disclosure
statement on the inside cover before
connecting your Radial JDX 48.

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

CAUTION STATEMENT

Please read before

connecting your Radial JDX 48

THE JDX 48 IS NOT A LOAD BOX

It is mandatory that your amplier be connected to a loudspeaker or load
box at all times. The JDX 48 does not provide a signicant resistive load
for an amplier to safely operate. Damage may occur to your amp if the
JDX 48 is used without a proper loudspeaker load.

BEFORE CONNECTING OR DISCONNECTING THE JDX 48.

It is your responsibility to conrm the JDX 48 is connected properly before
operating your amplier. If you are unsure about connecting or operating
the JDX 48 consult a qualied technician or see your dealer. Damage
caused by improper operation is not covered under the warranty. See the
back cover for warranty details.

CAUTION - USE OF THE JDX 48 WITH AMPLIFIERS WITH BRIDGED

OR BALANCED SPEAKER OUTPUTS IS STRICTLY PROHIBITED.

Although these types of circuits (typically a type of a class-D design) are
rarely employed on instrument amps. Using the JDX 48 with them can
cause an electrical shock unless the JDX 48 ground lift switch is depressed.
Please consult the amplier manufacturer to ensure the power output
section of your amp is not designed this way. As we have no control over
the use of these amps, for legal liability reasons, Radial Engineering Ltd.
strictly prohibits use of the JDX 48 with such ampliers.

ALWAYS TURN YOUR AMPLIFIER OFF

Radial JDX 48 Amplier Direct Box

Users Guide

Table of Contents Page

Design Concept ............................................................1

Applications ..................................................................2

Feature Set ...................................................................3

Signal Flow ...................................................................4

Making Connections .....................................................5

Using the JDX 48 .........................................................6

Using the JDX 48 with a Microphone ...........................6

Using With the Phazer ..................................................7

Specications ...............................................................8

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

Congratulations on your purchase of the Radial JDX 48 guitar amp direct
box, a unique tool for recording and performing with amplied electric
guitar. The JDX 48 is an active speaker-level DI that taps the natural
tone of your amplier and interfaces it with professional recording and
PA systems.

The Radial JDX 48 is easy to use, however it differs signicantly from
standard direct boxes. Like any tool, the best way to get the most out
of your JDX 48 is by understanding the design, functions and safety
features. We recommend you take a few minutes to read this manual
before operating your JDX 48.

Should you have any questions regarding the JDX 48 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 48, one small step for mankind, one huge leap for tone fanatics!

DESIGN CONCEPT

The JDX 48 differs from a standard DI like the Radial J48. A standard DI
taps the output of the guitar before it is connected to an amplier. The JDX
48 taps the output of your amplier yielding a completely different sound.

The JDX 48 is placed between the amplier and loudspeaker. A proprietary
reactive circuit follows the constantly changing interaction between amp
and speaker to capture the dynamic response of your amp. Then an active
multi-stage lter processes the signal to emulate the frequency response
of a loudspeaker and nally, the JDX 48 uses a Class-A buffering amplier
to output a signal suitable for pro-recording and PA systems.

JDX 48 Amplier Direct Box vs. Standard Direct Box
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 amplies
the levels of the direct signal.

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

JDX 48 Amplifier DiStAnDArD Di miXing ConSole

The Radial JDX 48 is inserted between the amplier and speaker cabinet
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 48 provides great sound
while eliminating bleed from other instruments, like drums, from leaking
into the guitar mix.

Radial Engineering Ltd.

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JDX 48 Amp Direct Box