Radial Engineering JPC Manuel utilisateur

User Guide

RadialEngineering

1638 Kebet Way, Port Coquitlam BC V3C 5W9 tel: 604-942-1001 • fax: 604-942-1010

email: [email protected]•web: www.radialeng.com

Radial Engineering is a division of C•TEC (JP CableTek Electronics Ltd.)

JPC

www.radialeng.com

JPC USER GUIDE

Consumer To Pro Stereo Direct Box

TABLE OF CONTENTS PAGE

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

Input & output panel feature set .............................................. 2

Insideview &features ............................................................. 3

Designconcept ....................................................................... 4

Development ........................................................................... 5

Blockdiagram and specifications............................................ 8

Frequentlyasked questions .................................................... 9

Warranty.................................................................................. Backcover

RadialEngineering

1638 Kebet Way, Port Coquitlam BC V3C 5W9

tel: 604-942-1001 • fax: 604-942-1010

email: [email protected] • web: www.radialeng.com

Radial Engineering Ltd. is a division of

C•TEC

(JP CableTek Electronics Ltd.)

Features and specifications are subject to change without notice.

JPC - Manual V1.0 part#: R800-9631-00

True to the Music

Radial Engineering JPC User Guide

INTRODUCTION

Congratulations on your purchase of the Radial JPC Stereo

Direct Box

The Radial JPC™ is an active ‘consumer to pro’

stereo direct box specifically developed for

computer sound cards and electronic media. It

features 1/4” TRS, 1/8” TRS and dual stereo

RCA input connectors. All of which may be

used as inputs, or thru-puts. The XLR

outputs are transformer isolated to

eradicate hum and buzz caused by ground

loops. The JPC is 48V phantom powered,

eliminating the need for batteries while

allowing long cable runs. The compact

yet ultra-rugged bookend design allows

the Radial JPC to be used in the most

demanding rental and touring

environments.

We invite you to read through this manual

before using your Radial J48 so that you can

maximize it’s potential. Please log onto

www.radialeng.com for further details and

updates. We also invite you to forward any

comments, questions or suggestions to

[email protected]. We love to hear from you!

Enjoy.

OUTPUT PANEL FEATURES

6. Stereoground lift toggleswitch (on side).

7. TwinXLR male outputconnectors follow AESstandard

withPin-1 ground andPin-2 hot.

8. No-slipfullrubber bottom providesmechanical isolation,

electricalinsulationand‘stay-put-ability’!

9. Bookenddesign with baked enamelfinish. 14 gauge

steeloutershellcreates protected zone around

connectorsand switches. Finished in toughbaked

enamelforyearsof great ‘looking’ performance.

True to the Music

Radial Engineering JPC User Guide

INPUT PANEL FEATURES

1. –10dBpad reduces thelevel goinginto the JPCfrom

loudsources that could overloadthe circuit andcause

distortion.

2. 48VPower on LEDslets you knowthat phantom has

beenturnedon and ispoweringthe two channels.

3. 1/4”TRS connecter that will alsowork with ¼” mono

instrumentsignals!

4. 1/8”TRS stereo connector designed forPCs, laptops,

andpersonalmusic players makes connectioneasywith

1/8”to 1/8” cable.

5. StereoRCA connectors aregreat for connectingCD

playersandvideo machines. RCAthru-putsfor flexibility.

True to the Music

Radial Engineering JPC User Guide

INSIDE VIEW

10. IsolatedXLRconnectors to eliminatechassisground potential.

11. Activebalanced drive circuitfor long cableruns withoutsignal loss.

12. Transformersonboth inputs provide100% isolation to eliminatehum and noisecausingground loops.

13. Militarygrade PC boardwith full surfaceground plane toreduce RF noisesusceptibility.

14. Longlife, high cyclerated push switchesforreduced maintenance.

15. WeldedI-beamconstructionmakesit impossible totorque the PCboardand provides maximumresistance

againstcoldsolder joints.

True to the Music

Radial Engineering JPC User Guide

DESIGN CONCEPT

TheRadialJPCisastereodirect box that has been

specificallydesignedforusewithcomputersoundcards

andotherconsumerelectronicproducts. TheJPCallows

thesedevicestobeconnectedtoaprofessionalsound

system. TheJPCis unique inthatit combines the

advantagesoftransformer-isolatedinputswithanactive

drivecircuit,givingyouthe‘bestofboth worlds’ in a

compactandextremelyflexiblestereopackage.

Transformercoupled inputshavetheuniqueadvantageof

isolatingthe‘source’fromthe‘destination’. Thisproven

approacheliminates 60-cycle hum and buzz caused by so-

calledground loops when two piecesofelectrically

powereddevicesareconnectedtogether.Becausethe

activecircuit does all of the impedance conversion and

balancing,adedicated1:1transformercanbeused. This

resultsinahybriddesignthatisat once great sounding,

compactand moreaffordable.

Aswithallgreatdesigns,simplicityisa fundamental trait

andtheRadialJPC certainly fits the bill.Achoiceof 1/4”,

1/8”,andRCAinput/thru-putconnectorsmakeinterfacing

asnapwithalltypes of equipment. A single switchinserts

astereo–10dBpad,twopowerLEDsconfirm48V

phantomisturnedon,andapairofXLRoutputconnectors

roundout the feature set.

Ofcourselike all Radial products,theJPCis built to

handlethe mostabusiveenvironments.Ourunique

bookenddesign protects switches and connectors from

damagewhile the 14gaugesteelI-beamconstruction

eliminatesoutsidestressthatcould torque the PC board

andcausesolderjointfailure.Afull-bottomno-slippad

provideselectrical insulationandmechanicalisolationwith

plentyof‘stay-put’for use on hectic stages. Andwithits

bakedenamel finish, the Radial JPC will continue looking

greatforyears!

FeatureSet

•StereodirectboxdevelopedforPCsoundcards

•Converts–10dBconsumersignalstobalancedmiclevel

•Transformerisolatedinputs eliminates ground loops

•Compactdesigniseasytodeploy

•48V phantompoweringeliminatesbatteries

•Ultra rugged bookend, 14-gauge steelconstruction

•MayberackmountedwiththeRadialJ-Rak

•1/4”,1/8”andRCAconnectionoptions

•Unusedinputs can be usedasa thru-put

•Builtlikeatankwith a full3-year warranty

Primaryapplications

•Computersoundcard

•CDPlayer

•DJ Mixer

•DVDAudioplayer

•I-Pod

•Walkman

•Cassettedeck

•Videoplayer

•Stereo pre-amp output

Secondaryapplications

•Stereokeyboard

•Stereo drum machine

•Stereo sampler

True to the Music

Radial Engineering JPC User Guide

DEVELOPMENT

Aswith all cleverproducts, the RadialJPC’sdevelopment stems fromdemands from fieldengineers trying tofinda useful

andsimplesolution to a problemorchallenge. Today,engineersaretalking full advantage ofthepower of media technologyby

integratingcomputers,video players andcompactdiscs in theirproductions.But with the integrationof‘new technology’

comesthemany challenges ofconnectingthese ‘consumer’ devices tothe world of professionalaudio. Thus, the obvious

needforsuitable interfacing equipmentforconsumer audio devices hasspawnedthe development oftheRadial JPC.

Whynot just usetwo direct boxeswhen dealing withPCs, VCRs, andCD playeraudio outputs? Most directboxes and

interfacesuse a passive designthat employs lowcostinstrument DI transformersto do theisolation,balancing and

impedancematching. The JPC isan active devicethatemploys the transformerfor isolation only. Ouractivecircuit performs

thebalancingand impedance matchingandthis produces better sound.

Fortheaudio engineer, interfacingcomputersandvideo equipment toaprofessionalaudio system involves dealingwith

severalchallenges: forthe most part,consumerlevel products areoutfittedwith less thanidealconnectors, are generally

unbalancedandare notorious for causingsystemnoise.

Forinstance, the audiooutput connection froma portable PC isusually a 1/8”mini TRS (3.5mm)connector while audiofrom

aCD player isgenerallyan RCA connector. Although theconnectorsused are differentthe signal theseconsumer devices

outputismost likely highimpedance (unbalanced) and linelevel (-10 db).Thesehigh impedance linelevelsources must be

convertedto balanced mic levelsignals in order towork alongside microphonesignalsin snake systems,micsplitting

transformers,and consoles. TheRadial JPCis outfitted with1/8” TRS stereo input, dualstereo RCA jacks,and sports a

stereo1/4” TRS jackto make connectinga wide rangeof consumer productseasy. Themultiple connector typeson the JPC

eliminatetheneed for extraadaptorsbetween the audiodeviceand the JPC. A-10dbpad helps addressthevarious output

levelsfoundon consumer equipment. Somedevices,like a miniMP3player,haveonly a 1/8”headphoneoutput. The -10db

padinconjunction with theunitsvolume control canaccomadateeven this highoutputsignal.

Tofurther enhance functionality,all of theinput connectors aredesigned to actas thru-puts. This featureallows the signal

froma given sourcetonot only passthrough the JPCto the XLRbalancedoutput, but allowsthe system engineerto drive a

secondarymixer or recorder atthe same time. Thiswouldtypically be usedfor personal monitoring,forrecording a

performance,todrive a secondspeakersystem or possiblyanassistive listening system.

The JPC Active Hybrid Design

Probablythesingle most troublesomeaspect to system designis eliminating noisecausedby so-called groundloops. Most

consumerelectronicproducts are designedto work on theirown and assuch,do not incorporateextra‘problem solvers’ in

theircircuit design. You connect thecomputerto the soundcard, the soundcardto some batteryoperated speakers and

voila;it all worksfine! The trouble starts when youconnect the computerto a pro sound system. Allof a sudden,you get that

dreaded60-cycle hum. This ‘noise’ iscaused by strayvoltageand the resultingcommon mode noise asthe two devicesare

connectedtogether. The solution: transformerisolation.

Althoughthe Radial JPCisan active directbox, the inputconnections are 100%transformerisolated giving riseto its ‘hybrid’

designation.Theseisolated inputs reducenoisewhile the active drivecircuitperforms the impedance conversionand

balancingallowing long cable runs.This ‘best ofbothworlds’ solution makeshook-up noise-free, reducesinputcircuit loading

andgivesyou great sound!

Why balancing in the 1st place?

Therearemany reasons forconvertinghi-impedance signals tolow-impedancebalanced circuits: First andforemost, it allows

longcableruns without appreciable noise.Properimpedance and levelmatchingnot only improves soundquality, it also is

criticalwhen interfacing withmicrophonesnake systems thatare outfitted withsplitters. Splittersemploy mic bridging

transformers.Theseare designed toworkwith 600-Ohm microphone levels,whichwould otherwise be saturatedwithhigher

signallevels.Furthermore, since signalsfrommicrophones are usuallyrunningalong side theoutputfrom direct boxes,

excessivelevelscan cause crosstalkorinduced noise fromthehigher output device.TheRadial JPC automatically converts

thesesignalsto balanced miclevels,solvingthe problem.

48V Phantom Powering

TheRadial JPC is48V phantom powered. Thismeans that itderives its power source froma DC voltagesupplied from the

mixingconsolethrough the XLRcableas opposed tousingbatteries or alocalpower supply. Phantom powering makeshook-

upeasy and worryfree. Simply connect theJPCto the consolewith XLR cables,turn the phantompower on atthe console

andyou areready to go!

NOTE: Always ensure that the volume levels areat zerobefore turning on phantom power.This

will ensure the turn on transient spike does not harm your speakers or sound system.

Getting down to size!

Anothermajor concern forthe field technicianis keeping sizeto a minimum.What is thepoint of using a laptopcomputer only

tohave the interfacedouble its size!As a tool,the JPC iscompactenough to fitin a toolboxmaking it easyto carry anywhere

andquick to deploy.The compact sizealsomakes it easyto place adjacentto laptop computers andcan be storedin

computerbagsfor easy transport.

True to the Music

Radial Engineering JPC User Guide

USING THE RADIAL JPC

1. Make sure all levels are down before connecting!

AstheJPC employs standard48Vphantom powering fromthemixing console, itautomaticallyturns on when phantom

poweris activated. Make sure yoursystem levels areturned offasactivating phantom willcaused a loud popin the system

whenactivated. Thetwo power-on LEDsonthe front panelwillilluminate when phantom poweris present.

2. Connect the input side using 1/8” or RCA inputs

TheJPC features standardconnectors found onPCs and consumerelectronic devices. These areconnected just likea

homestereo system, output patchedto input. In mostcases,pre-made cables thatcamewith the audiodevice will work.

3. Connect the input side using 1/4” TRS input

The1/4” input can be usedas a monoinput or as a stereoinput. When used witha standard,two conductor,“guitar” cable

theinput will be mono. The monoinput signal willbe sent to the left XLRoutput only. When used with a speciallymade

dualmono -to- stereo1/4”cable, the inputsignal will be

outputon the left and rightXLR outputsin stereo. The JPC

doesthis by employinga TRS (tip,ring, sleeve) 1/4”jack that

canalso accept TS(tip, sleeve)1/4” connectors. This type

ofcable is essentalythe same asan “insert cable”used to

interfaceoutboardequipmentwith mixing consoles.

4. Using the Thru-puts

TheJPC input connectorsmay also be used asthru-puts to bridgethe signal to a secondmixer or taperecorder. This

meansthat any unusedinput can alsobe used asan output. Clever!

5. Using the XLR Output

TheJPC XLR outputsfollow the AESstandard with pin-1being ground andpin-2 hot. The XLRoutputs are generally

connectedto a snakesystem ordirectly into amixing console. The output of theJPC is miclevel and as such, shouldbe

connectedto the consolesmic pre-amp. The JPCis powered fromthe consoles 48Vphantom.

6. Using the PAD

A–10dB pad onthefront panel isused when auditioningthesource. Some computeraudio outputs alsoserveas

headphoneouts, which canoverload and saturate theJPC’sinputtransformers. Simply depress thepad if thesound is

distorted.

True to the Music

Radial Engineering JPC User Guide

Stereoconnector wiredto dualmono connectors

True to the Music

Radial Engineering JPC User Guide

SPECIFICATIONS & BLOCK DIAGRAM

J•PC Specifications

Frequencyrange 40Hz to 20kHz , (+/- 3dB)

Type Active with isolatedinputs

Powering 48-Voltphantom powered, 5mA draw

Size 2” x 3” x 6”

Weight 1kgor 2lbs

Dynamicrange 80dB

Distortion 0.5%at 1kHz with-10dB input

Intermodulationdistortion Lessthan 1%

Phasedistortion Less than 5ºat 100Hz, 0.1º at 1kHz

Linearresponse +/- 1dB from 50Hz to 15kHz

+/- 3dB from 20Hz to 20kHz

Inputconnections 1/4” TRS, 1/8” TRS, dual stereo RCA

Outputconnections XLR balanced, AESpin-2 HOT

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