Work Pro WCR 35 User manual

Brand: Work Pro

Model: WCR 35

Category: Supplementary music equipment

Type: User manual

This manual is also suitable for

WCR - 35

WCR - 35

User Manual

WCR35

OWNER'SMANUAL

Crossover

Theinformationcontainedinthismanualissubjecttochangewithoutnotice.

Nopartofthismanualmaybereproducedortransmittedinanyformorbyany

means,electronicormechanical,includingphotocopyingandrecordingofanykind.

1995,1996ALLRIGHTSRESERVEDEQUIPSONINC.

Page1

ReferenceManual

Page2 ReferenceManual

Readtheseinstructions.

Keeptheseinstructions.

Heedallwarnings.

Followallinstructions.

Donotusethisapparatusnearwater.

Cleanonlywithadampcloth.

Donotblockanyoftheventilationopenings.Installinaccordancewiththe

manufacturer'sinstructions

Donotinstallnearanyheatsourcessuchasradiators,heatregisters,stoves,or

otherapparatusthatproduceheat.

Donotinstallthesafetypurposeofhepolarizedorgrounding-typeplug.Apolarized

plughastwobladeswithonewidethantheother.Agrounding-typeplughastwo

bladesandthirdgroundingprong.Thewidebladeorthethirdprongisprovidedfor

yoursafety.Whentheprovidedplugdoesnotfitintoyouroutlet,consultan

electricianforreplacementoftheobsoleteoutlet.

Protectthepowercordfrombeingwalkedonorpinched,particularlyatplugs,

convenienceatplugs,conveniencereceptacles,andthepointwheretheyexitfrom

theapparatus.

Onlyusepowercordfromattachments/accessoriesspecifiedbythemanufacturer.

Useonlywithacart,stand,bracket,ortablespecifiedbythemanufacturer,orsold

withtheapparatus.Whenacartisused,usecautionwhenmovingthe

cart/apparatuscombinationtoavoidinjuryfromtip-over.

UnplugthisapparatusduringlightningstormsorwhenunusedforlongPeriodsof

time.

Referallservicingtoqualifiedservicepersonal.Servicingisrequiredwhenthe

apparatushasbeendamagedinanyway,suchaspower-supplycordorplugis

damaged,liquidhasbeenspilledorobjectshavefallenintotheapparatus,the

apparatushasbeenexposedtorainormoisture,doesnotoperatenormally.

Page3ReferenceManual

Contents

SafetyInstructions

Installation

Specifications

...................................................................................................2

................................................................................................................3

........................................................................................................10

IntroductionandControl

GeneralOperating

...................................................................................5

....................................................................................7

INSTALLATION

RACKMOUNTING

CONNECTORS

Yourwascarefullypackedinthefactoryandthepackagingwasdesignedtoprotect

theunitfromroughhandling.Nevertheless,werecommendthatyoucarefullyexaminethe

packaginganditscontentsforanysignsofphysicaldamage,whichmayhaveoccurredin

transit.

lftheunitisdamaged,pleasedonotreturnittous,butnotifyyourdealerandtheshipping

companyimmediately,otherwiseclaimsfordamageorreplacementmaynotbegranted.

Shippingclaimsmustbemadebytheconsignee.

Thefitsintoonestandardrackunitofspace(13/4").Pleaseallowatleastanadditional

4"depthforthe connectorsonthebackpanel.Besurethatthereisenoughairspacearound

theunitforcoolingandpleasedonotplacetheonhightemperaturedevicessuchas

poweramplifiersetc.toavoidoverheating.

ThehastobeinstalledusingXLRconnectors.AlthoughtheinputsandoutputsARE

fullybalanced,theautomaticservo-functionallowsthemtooperatewithunbalanced

sources/loads.

Theinputshaveanimpedanceof60kOhmsandcanbedrivenbymostinputsources.Ifa

device'soutputrequiresaloadof600Ohms(providedwithmostoutputtransformers),600

Ohmresistorsshouldbetiedacrosspins2and3ontheinputconnectors.

Asstandard,theoutputsoftheareelectronicallybalanced(transformerbalancing

optional)andhaveanoutputimpedanceof40Ohms.Whendrivingtransformercoupledloads,

itmaybenecessarytocreatea600Ohmsourceimpedance.Forthispurpose,installtwo287

Ohmresistors(tolerance:1%)inserieswithpins2and3.

90%ofallmistakesinaudioinstallationscanbeattributedtoincorrectanddefectiveaudio

connections!Inordertoutilizethetoitsfullpotential,pleasepayspecialattentionto

thefollowingsection.

Forbetterunderstanding,thetechnicaldifferencebetweenandsystems

mustbeclarified:

Unbalancedoperationischaracterizedbyasingleconductorcablewiththecenterconductor

carryingandtheshieldatground.

WCR35

Impedance

WCR35

Unbalanced/BalancedOperation

WCR35

TheUnbalancedSystem

TheBalancedSystem

unbalancedbalanced

Page4 ReferenceManual

Abalancedoperationisdefinedasatwoconductorshieldedcable,whereeachofthetwo

centerconductorscarrythesamesignalbutofoppositephase.Thehaveequalbutinverted

potentialdifferencesfromthatofground.

Theadvantageofthebalancedsystemisbasedonthedifferentialamplifierinasubsequent

devicesuppressingallequalphasednoisewhichhasbeeninducedduringitstransmission

downthecablelink.However,theoriginalsignalwillbeamplifiedandretainallitsoriginal

integrity.

Inthisway,audiosignalscanbetransmittedwithoutinterferenceorlossacrosslongdistances.

Balancedorunbalancedsystemsrequiredifferentwiring.Pleasereadthenextsection

carefullyandpaycloseattentiontothecorrectwiringrequirementsoftheunitsintheaudio

chain.

TheCorrectWiringForBalancedOperation

WCR35

BalancedOperation

WCR35

UnbalancedOperation

WCR35

lftheunitprecedingtheusesoutputbalancing,werecommendthatyouusebalanced

audioconnections.Thiswillavoidinterferencesuchasmainshumetc.

Formaximumhumrejection,youshouldavoidcommongrounding,whichmeansgrounding

the'sinputsandoutputs.

Werecommendthatyouconnecttheshieldoftheinputcabletothegroundofthesignalsource,

makingsurethattheshieldisnotconnectedtothe'sinputconnectors.Theshieldof

thecablesisconnectedtothegroundofthe'soutputs,butmakesurethattheshieldof

thecorrespondingcableendsarenotconnectedtothegroundofthesubsequentunits

Generallyspeaking,theshieldconnectionwillbetiedtothesourceunits,butnottodestination

units.Pleaseavoidcrosslinkingpin3oftheXLRconnector.

Ifyoustilldevelophum,itmaybehelpfulinsomecasestoconnecttheshieldsontheinputsof

thesubsequentdevicesalso.

TheusesXLRconnectors.Werecommend,inaccordancewiththeinternationally

agreedIEC268-12standard,pin1:ground(sleeve),pin2:positiveinputandpin3:negative

input.Weadvisethatyouadheretothisstandard,inordertoprovidecompatibilitywith

precedingorsubsequentunits.

ThefollowingFigure5showsthecorrectconnectionforthebalancedinputwiring,whereas

Figure6showsthecorrectconnectionforthebalancedoutputwiringforthe.Please

notethatyoucandistinguishbetweenthefiguresbyobservingtheshieldconnections.

Althoughtheisequippedwithelectronicallybalancedinputsandoutputs,itcanalso

functionunbalanced.Theautomaticservo-functionrecognizestheunbalancedconnectors

andcompensatesforthe6dBleveldifferencewhichoccurswhenusedwithunbalanced

connections.

Ifunbalancedoperationisrequired,pleaseconnectpin3topin1(ground)oftheXLR

connector.Asaresultpin2carriesthepositive(+/hot)signal.Ifpin3andpin1arenotjoined,

thenegativeinputwillbeclosespace"open"resultinginadrasticdeteriorationinthesignal-to-

noiseratio.

Thisappliestoboththeinputandoutputconnections.Pleasenoteinthisapplication,thecable

OPERATIONWITHXLRCONNECTORS

Page5ReferenceManual

[1]

[2]

[3]

[5]

[6] [7]

FrontPanel

WCR35Front&RearPanelControls&Connections

[1]INPUTGAINcontrol

WCR35

[2]X'OVERFREQ.control

TwoINPUTGAINpotentiometers(+/-12dB)matchthesensitivityofthe'sinputsto

anyconsole.EachhasanassociatedCLIPLED.

ThecrossoverfrequenciesaresetbyadjustingtheX'OVERFREQ.Potentiometerateach

channel.

shieldhastobeconnectedonbothends.

ThemainsconnectionoftheismadebyusingamainscableandastandardIEC

receptacle.Itmeetsalloftheinternationalsafetycertificationrequirements.

Pleasemakesurethatallunitshaveapropergroundconnection.Foryourownsafety,itis

advisablenottoremovethegroundconnectionwithintheunitsoratthesupply,orfailtomake

thisconnectionatall.Theaudiogroundoftheisinternallycapacitorde-coupled,to

isolateitfromthesupplyearth.Itisthereforenotadvantageoustoattemptgroundloopproblem

solvingusingthismethod.

Beforeyouswitchontheunit,checkthatitisconfiguredtomatchyourACmainsvoltage

requirements.Ifitdoesnotcomply,thenitisnecessarytoswitchtheoperatingvoltagetothe

correctsupplyrequirementsbeforeturningontheunit,otherwisetheunitcouldbeseverely

damaged.Youwillfindthevoltageselectorattheback,adjacenttotheIECreceptacle.

PleasenotethattheACvoltageselectionisdefinedbythepositionoftheselectorholder.Ifyou

intendtochangetheoperatingvoltage,movethevoltageselectorswitchtoupordown.

Matchingthetwomarkersmonitorstheselectedvoltage.

Asafetyfuseprotectstheunitfromseriousdefects.Ifthefuseblows,thisisawarningsignand

alwaysindicatesthatthecircuitisoverloaded.Thefaultmustalwaysberepairedbeforethe

fuseisreplaced.

Ifthesafetyfuseblowsandneedsreplacingaftertheunitisrepaired,pleasemakesurethat

youreplaceitonlywiththeidenticaltypeandrating.NEVERusefusesofdifferentratingsor

coverfaultyfuseswithaluminumfoil.Thiscancausefireandelectricshocksandwillendanger

yourlifeandthelivesofothers.

For200-240Voltsthefuseratingis125mAslow-blowand250mA slow-blowformains

voltagesof100-120Volts.

MAINSCONNECTION

WCR35

OperatingVoltageSelector

SafetyFuseReplacement

Page6 ReferenceManual

[3]RANGEswitch

Crossoverfrequenciesfrom80to900Hzor800Hzto9kHzrespectivelyarechosenbythe

RANGEswitch.

[4]LF/MF/HFGAINcontrol

[5]LF/MF/HFMUTEswitch

[6]MODEswitch

[7]MONOBASSswitch

Eachbandhasit'sownLF/HFGAIN(+6dB)controltoallowsomefine-tuningofthesystemto

give(usually)aflatterfrequencyresponse.

TheMUTEbuttonenableseasyauditioningoftheselectedband(s).

Stereo3-wayormono5-wayoperationischosenbytheMODEswitch.

InstereomodethebassoutputsmaybesummedinmonoviatheMONOBASSswitch.

REARPANEL

[1]MAINSCONNECTOR/FUSEHOLDER/VOLTAGESELECTOR

[2]HIGH/MID/LOWOUTPUTS

WCR35

[3]INPUTS

Beforeyouconnecttheunit,pleasemakesurethatthedisplayedvoltagecorrespondstoyour

mainssupply.

PleasenotethattheACvoltageselectionisdefinedbythepositionoftheselectorholder.Ifyou

intendtochangetheoperatingvoltage,move

thevoltageselectorswitchtoupordown.Matchingthetwomarkersmonitorstheselected

voltage.

Pleasenotethat,dependingonthemainsvoltagesuppliedtotheunit,thecorrectfusetypeand

ratemustbeinstalled.

Pleaseusetheenclosedmainscabletoconnecttheunittothemainspowersupply.

Yourprovides6outputsforstereoand5formonooperation.

Inputsareelectronicallybalanced(2forstereo,1formonooperation).

Onceagaintwolegendingstripesrefertostereo3-way(top)andmono5-wayoperation

(bottom)respectively.Inmono5-wayoperation

certaininputsandoutputsdonotapply,andarenotlegended.

[1]

[2]

[3]

RearPanel

Page7ReferenceManual

TOOLBOX

SETTINGINPUTLEVELS

ReferencePointMicrophone(RPM)

RealTimeAnalyzer(RTA)

WORK

Variable-FrequencySineWaveOscillator(SWO)

YourEars

WCR35WCR35

WCR35

Alignmentshouldbecarriedoutwithagoodqualitymicrophone,withaflatresponseatleast

from80Hztoabout15kHz,placedabout5minfrontofthespeakerstackbeingtuned,andata

heightmid-waybetweenthedriverscoveringthetwobandsinquestion.Wewillcallthisthe

ReferencePointMicrophone.WhenusingaRPM,onlyonestackatatimeshouldbetuned.

Thisistrueforbandlevelsetting,timealignmentandsettingcrossoverfrequencies.

TheRPMusuallyneedstobemovedbetweenmeasurements.

DesignedtoworkinconjunctionwithaRPM,thisdeviceoutputsbroadband(pink)noiseinto

thePAviathemixingdesk,andmonitorstheacousticresultviaamultichannelfrequency

analyzer/meter.TheULTRA-CURVEdoesallthisandmore.

Sweepablethroughouttheaudiospectrum,thissinewavegeneratorissimple,inexpensive,

andmaybepluggedintothemixingconsoleviaalineinput.Ifitsoutputlevelvarieswith

frequency,youcouldpatchacompressor/limiterwithslowtimeconstantsandmassiveratio

betweenitandtheconsoletoclampit.YouwillalsoneedaRPM.

Whenauditioningtheoverallsoundofasystem,besuretomoveabouttheauditoriumtocheck

forhotandcoldspots.Thesoundshouldbeoptimizedfortheaveragelisteningposition,

withoutbeingoverlycompromisedelsewhere.Oftenthismeansrunningthesysteminmono.

Atalltimes,havingmadetechnicaladjustmentsusinginstrumentation(SWO,RTA,RPM,

metersandLEDs),useyourearstocheckthattheresultisreasonable.

Thereis+/-12dBcut/boostavailableonbothinputs.

Usually,mixeroutputsensitivityandpoweramplifierinputsensitivitywillbematched:0dB

outputonthedeskwillproduce0dBonapoweramplifier'smeter(ifithasone).Inwhichcase

theshouldbesettohaveaneutraleffectonsystemgain,andallinputand

outputlevelcontrolsshouldreadzero.

Wherethedesk(orDJconsole!)isrunningat-10dBV(semi-prolevel),butthepoweramps

aresetupfor+4dBuoperation,youwillbelookingforthecrossovertoprovideupto14dBof

gain.Trysettingtheinputlevelto+12dBforstarters.

Ifyouarenotsurewhatsensitivityyourconsolehas,trythefollowingprocedure:muteallWCR

35outputs.Drivetheconsolewithaconstantsignal(SWO,RTAorevenmusic)untiltheonset

ofclippingontheconsole'slevelmeters(usuallyindicatedbyaclipLED,orwhenthemetershit

theroof!).adjusttheinputleveltotheuntilitsinputCLIPLEDjustlights.Backoffthe

consoletonormaloperatinglevel(0dB).Nowbothconsoleandhave(roughly)

matchingsensitivities.

Carryouttheaboveprocedurewiththepowerampsturnedoff!

SETTINGBANDLEVELS

RPM,RTA,SWOAgain

WORKBandlevelsshouldoptimallybesetwithaRTA(suchasisfoundintheULTRA-CURVE

programmableanalyzer/equalizerwhichnoself-respectingPAshouldbewithout!)toenable

Page8 ReferenceManual

thesystemtobetunedtoaflatresponse.Morelaborious,butatleastasaccurate,wouldbeto

plottheresponsecurveusingasweepableSWO.BothrequireaRPM.

TheRTAandSWOmethodsinvolvemutingallbutonebandononeside,firingpinknoiseor

theappropriate(X-over)frequencythroughthesystematacomfortablelevel,andobserving

theSPLattheRPM.Switchonanadjacentband.ThemeasuredSPLattheRPMshould

increaseby+3dBatthecrossoverpoint.Repeatforallcrossoverpoints.

Doublecheckbylookingattheentireaudiospectrum.Inahall,thefrequencyresponseofthe

systemwill becolored(whichiswhymassivesystemsaresometimescalibratedoutdoors).

Whatyouwillbelookingforisnotatrueflatresponse:thatwillonlycomeafterequalization.

Ratherseekoutfaultlinesbetweenbands.Ifthefrequencyresponseisverycurvedindeed,

however,itmightbebettertousethecrossovertoflattentheroombeforeapplyingEQ.Inthis

case,faultlinesmightjusthavetobeacceptedandcompensatedforasbestyoucanwith

systemEQ.

Extremelystablehigh-gualitypotentiometersobviatetheneedforfixedcardfrequency

dividersofferingadegreeofon-siteusercontrolnotfoundoncertainmoreexpensiveunits.

Theseoperateintwoswitchableranges,from80-900Hz,andfrom800Hz-9kHz.Turnover

frequenciesbeyondthoselimitsarenevernormallyrequired.Theslopeis24dB/octave.And

thefiltersaretheuniversallyacclaimedlinkwitz-Rileytype.Highqualitycomponents(1%metal

filmresistorsand2%capacitors)ensurezerophaseandamplitudeerroratallcrossover

frequencies.

Forsettingcrossoverfrequenciesbetweenbins&hornsetc.,pleaserefertothe

manufacturer'sspecifications.Ifpossible,checkresponsecurvesofthevariousloadeddrivers

(i.e.incabinets/behindhorns)toavoidcrossingoveratapeakortrough.Lookinsteadfor

relativelyflatmatchingareas.

Neverdriveloudspeakers/hornsatfrequenciesbellowthemanufacturer'sspecifiedbandwidth.

TIP:Crossingoverabovearecommendedfrequencyoftenputslesssfressonahorndriveror

tweeter,resultinginalongerdiaphragmlifeandclarity,versusaslightdropinsystemefficiency.

CertainPAsystems,particularlythoserequiredtodeliverloud,deepbass,runthelowendin

mono,whilethehighsareinstereo(lowfrequencysoundishardtolocalize).Byplacingall

basscabsinanarray(theclosertoaspherethebetter,inpracticetwomaybeontopoftwo

others),efficiencyisimprovedoverallotherstackingmethods.E.g.twocabstogetherwill

provide+3dBmore(doublethevolume)oflowbassthanthesametwoseparatedbyastage.

Fourcabstogetherprovideanextra+6dB.Why?Togethertheyformasinglesource.Apart

theyarediscretesources.Thesphericalnatureofbasswavesmeansthatapartthereisbound

tobesomephasecancellationinthemiddle.Trydroppingtwostonesintoapondtogetherand

apartinyourmind'seye.Gotthepicture?Instereomodethecandelivermonobass

viatheswitchcalledMONOBASS.

Also,manystudionearfieldmonitorsnowcomewithoptionalmonosub-woofersystems.In

stereomodethecandeliveramonosignalsuitablefordrivingsuchasub-wooferor

SPLAtRPM

SeekingOutFaultLines

WCR35

SETTINGCROSSOVERFREQUENCIES

MONO-INGTHEBASS

Page9ReferenceManual

monobasssystem,whileremovingthesefrequenciesfromthemainmonitors.

Whenpreparingamastertape,anengineershouldalwayscheckformonocompatibility.Too

muchout-of-phasematerialcancausesignalstoreduceorevendisappearinmono.When

cuttingontovinyl,out-of-phasebasswillcausethecuttertojumpaboutwildly,resultingina

quietcut.Bypassingaproblemtapethroughthe,mono-ingthebass,thensumming

thehighandlowoutputs,out-of-phasebasswillbeeliminatedbelowthechosencrossover

frequency.

WCR35

Page10 ReferenceManual

Servo-balancedinput

RF&15Hzhighpassfilteroneachinput

Variable-12to+12dB

60kohms,balanced

-10dBvto+4dBu

+20dBubalancedandunbalanced(unitygain)

Betterthan40dB

Electronicallyservo-balancedoutputstage

40ohms,balancedandunbalanced

+26dBubalanced+21dBuunbalanced

16Hzto40kHz,+0,-1dB

0.005%typ.

0.01%typ.

-92dBu(20Hzto22kHz,unweighted)

Betterthan50dBu

Statevariable24dB/octaveLinkwitz-Rileyfilter

Stereo3-wayormono5-wayselectable

Switchable80to900Hz/800Hzto9kHz

Variable80to900Hz/800Hzto9kHz

Variable-to0dB

Outputscanbeswitchedoff

Instereomodebothbassoutputscanbesummed

Selects

Allactiveswitchesareilluminated

Highlighttheactivecontrolsin2-wayor3-waymode

100-120/200-240VAC50-60Hz

10watts

250mA(100-120v);125mA(200-240v)slow-blow

StandardIECreceptacle

13/4"(44mm)x19"(483mm)x283/4"(155mm)

3.3kg(7.29lbs)

4.3kg(9.51lbs)

Variable-to0dB

tereo3-wayormono5-way

INPUTS

OUTPUTS

FILTER

FUNCTIONS

INDICATORS

POWERSUPPLY

PHYSICAL

Type

Filter

InputGAINcontrol

InputImpedance

NominalOperatingLevel

MaximumlnputLevel

CMR

Type

Outputlmpedance

MaximumOutputLevel

Bandwidth

THD

IMD(SMPTE)@+10dBu

Noise&Hum,unitygain

Crosstalk@20kHz

Type

MODEswitch

RANGEswitch

X'OVERFREQ.control

LFGAINcontrol

HFGAINcontrol

LF/MF/HFMUTEswitches

MONOBASSswitch

SWITCHLEDindicators

MODELEDindicators

MainsVoltages

PowerConsumption

Fuse

MainsConnection

Dimension

NetWeight

ShippingWeight

MFGAINcontrol

MODEswitch

SPECIFICATIONS

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Work Pro WCR 35 User manual

Brand: Work Pro

Model: WCR 35

Category: Supplementary music equipment

Type: User manual

This manual is also suitable for

WCR - 35

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