Radial Engineering JPC User's Guide

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5
tel: [phone] • fax: [phone]

www.radialeng.com

email: [e-mail] • www.radialeng.com

JPC

STEREO PC DI BOX

ISOLATED IN· ACTIVE OUT

MK3

USER GUIDE

JPC USER GUIDE

Stereo PC Direct Box

TABLE OF CONTENTS PAGE

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

Input & output panel features ..................................................2

Inside view & features .............................................................3

Connecting the JPC.................................................................4

JPC features ............................................................................7

Frequently asked questions.....................................................8

Block diagram and specifi cations ............................................11

Warranty ....................................................................Back cover

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5
tel: [phone] • fax: [phone]
email: [e-mail] • web: www.radialeng.com

Features and specifi cations are subject to change without notice.

®

INTRODUCTION

Congratulations on your purchase of the Radial JPC direct box.

The Radial JPC is a stereo direct box that has been specifi cally designed to interface computer sound
cards and other consumer electronic products with professional sound systems. It is unique in
that it combines the advantages of transformer-isolated inputs with an active drive circuit,
giving you the ‘best of both worlds’ in a compact and extremely fl exible package.

Transformer coupled inputs have the unique advantage of isolating the
‘source’ from the ‘destination’. This proven approach eliminates 60-cycle hum
and buzz caused by ground loops when two electrically powered devices are
connected together. Because the active circuit does all of the impedance
conversion and balancing, a dedicated 1:1 transformer can be used. This
results in a hybrid design that is at once great sounding, compact and
more affordable.

As with all great designs, simplicity is a fundamental trait, and the
Radial JPC certainly fi ts the bill. A choice of ¼”, 3.5mm and RCA input /
thru-put connectors make interfacing a snap with all types of equipment.
A single switch inserts a –15dB pad into both channels, two power LEDs
(one for each channel) confi rm 48V phantom is turned on, and a pair of
XLR output connectors round out the feature set.

Of course like all Radial products, the JPC is built to handle the most
abusive environments. Our unique bookend design protects switches and
connectors from damage while the 14-gauge steel I-beam construction
eliminates outside stress that could torque the PC board and cause solder
joint failure. A full-bottom no-slip pad provides electrical insulation and mechanical
isolation while also helping the JPC ‘stay-put’ on hectic stages.

Although the JPC is really easy to use, we highly suggest you read through this
manual and familiarize yourself with the JPC’s features. This will help you make the most
out of this marvellous device. We also suggest visiting our web site at www.radialeng.com for more
information and updates. Should you have any questions or concerns that are not covered in this manual
we invite you to contact us by email at [e-mail].

Now plug in your JPC and let the show begin!

True to the Mu sic

Radial Engineering JPC User Guide

1

®

FEATURES AND FUNCTIONS



True to the Music



INPUT PANEL

1. –15dB Pad is used to prevent loud sources from
overloading the JPCs audio circuit.

2. 48V Power LEDs let you know that phantom has been
turned on and is powering the two channels.

3. Dual 1/4” jacks can be use for a stereo device or two
mono signals.

4. 3.5mm TRS stereo mini connector designed for direct
connection of PCs, laptops, and portable audio devices
without adaptors.

5. Stereo RCA connectors are great for connecting
consumer electronics like CD players, VCRs and DJ
mixers. RCA thru-puts provide a duplicate output for
splitting and routing fl exibility .

Radial Engineering JPC User Guide

OUTPUT PANEL

6. Ground lift switch breaks the ground connection between
the input and the output. The default position is lifted to
prevent hum from ground loops.

7. Stereo left and right XLR male output connectors are
isolated from the chassis and follow AES standard with
pin-2 hot.

8. No-slip full rubber bottom provides mechanical isolation,
electrical insulation and ‘stay-put-ability!’

9. 14-gauge steel bookend design creates a protective zone
around buttons and connectors. Tough baked enamel

fi nish for years of ‘great looking’ performance.

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