Radial Engineering DIRECT-DRIVE User's Guide

DIRECT-DRIVE

User Guide

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5

Tel: [phone] • Fax: [phone] • Email: [e-mail]

JDX Direct-Drive™ Amp Simulator and Direct Box

Overview.......................................................................................... 1

Features .......................................................................................... 2

Making Connections ........................................................................ 3

Tone Voicing ....................................................................................4

Rear Panel Connections...............................................................5-6

Block Diagram ................................................................................. 7

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

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

Thank you for choosing the Radial™ JDX Direct-Drive™. We believe this to be one of the most effective and convincing
tools for guitarists that play on the stage or in the studio, and want to do so without the use of a guitar amp.

The Direct-Drive was designed to be intuitive and easy to use. But as with all products, taking a few minutes to read the
manual will ensure a better understanding and increase your enjoyment.

If after you have done your homework, you nd yourself asking about something that may not be covered, please visit

the FAQ page on the web site. This is where we post questions from users and important updates. If after that you still do

not nd the answer you are looking for, feel free to send us a note at [e-mail] and we will do our very best to

respond in short order.

Now get ready to blast away as if standing in front of a wall of amps… without any amp at all!

OVERVIEW

The JDX Direct-Drive™ is a unique device that emulates the sound of a guitar amplier while doubling up as a direct box.

In other words, with the Direct-Drive on a pedalboard, you can do a gig without carrying an amp to the club or record
silently using all your favorite pedals. The design begins with a ¼” guitar input and passive thru-put to feed a stage amp

plus a dedicated tuner output. The signal then passes through a series of lters to create Radial’s signature JDX™ tone.
This is modelled after the sound of a Shure SM57™ in front of a Marshall™ 4x12 cabinet. This is augmented with two
amp settings that add the character of a Marshall JCM™ head or Fender Twin™ combo to the mix. These can be further
tailored using a presence switch to add extra sparkle. The amp tone signal exits the Direct-Drive via either a ¼” guitar

level output or via a balanced XLR to feed the PA. The Direct-Drive may be powered using a dedicated standard 9V power
brick or an isolated power supply.

COMBO

‘Fender Twin’

Radial Engineering Ltd. JDX™ Direct-Drive™ User Guide

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STACK

‘Marshall JCM’

JDX 4x12

‘Cabinet with SM57’

FEATURES

1. INPUT: ¼” input for the guitar or bass.

2. OUT: ¼” ‘amp tone’ output used to feed a processor or second

amp.

3. XLR OUTPUT: Balanced mic level output used to feed the PA
system or recorder.

4. THRU: Used to feed the on-stage amplier.

5. TUNER: Hi-Z always-on output used to connect an electronic
tuner.

6. 9VDC: Standard Boss-style power supply connection.

7. POLARITY: Toggles pin-2 and pin-3 on the XLR out to phase-
align your amp with the stage monitors.

8. GROUND: Lifts pin-1 on the balanced XLR output to help
reduce hum and buzz caused by ground loops.

9. AMPLIFIER: Selects between COMBO, STACK and JDX for
distinctive amp tones.

10. PRESENCE: 2-position switch with bypass and on for extra
sparkle on the STACK & COMBO settings.

11. POWER: LED lets you know the Direct-Drive is ready and on.

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Radial Engineering Ltd. JDX™ Direct-Drive™ User Guide

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