Klark Teknik dn330 User manual

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Operators & Service
Manual
DN330
EVI PRO AUDIO GROUP
KlarkTeknikBuilding,
WalterNashRoad,Kidderminster,
WorcestershireDY117HJ
England
Tel:[phone] Fax:[phone]

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DECLARATION OF CONFORMITY
TheDirectiveCoveredbythisDeclaration
89/336/EECElectromagneticCompatibilityDirective,amendedby92/31/EEC&93/68/EEC
EquipmentType ProductName
PresetEqualiser DN330
TheBasisonwhichConformityisbeingDeclared
TheproductsnamedabovecomplywiththerequirementsoftheaboveEUdirectivesbymeeting
thefollowingstandards:
EN 50081-1 (EN55022 class B)
EN 50082-1 (IEC801 Part 2, 4 / ENV 50140 / ENV 50141)
Signed: ........................... N. G. Tembe
Authority: HeadofEngineering
Date: 19thJanuary1996
Attention!
Theattentionofthespecifier,purchaser,installer,oruserisdrawntospeciallimitationstouse
whichmustbeobservedwhentheseproductsaretakenintoservicetomaintaincompliancewith
theabovedirectives.Detailsofthesespecialmeasuresandlimitationstouseareavailableupon
request,andarealsocontainedinproductmanuals.

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Attention!
Cables:
Thisproduct should onlybe used withhigh quality,screened twisted pairaudio cables, terminated
withmetal bodied 3-pinXLR connectors. Thecable should beconnected to pin1. Any othercable
typeorconfiguration fortheaudiosignalsmayresultindegradedperformanceduetoelectromagnetic
interference.
ElectricFields:
Should this product be used in an electromagnetic field that is amplitude modulated by an audio
frequencysignal(20Hz to 20KHz),thesignal to noise ratiomaybe degraded. Degradationofup to
60dB at a frequency corresponding to the modulation signal may be experienced under extreme
conditions(3V/m,90%modulation).

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CONTENTS
INTRODUCTION 8
THEDN330PRESETEQUALISER 9
INSTALLATION 11
INSTRUMENTFAMILIARISATION 13
AUDIO CONNECTIONS 14
SPECIFICATIONS 15
SERVICEINFORMATION 16
SCHEMATICS

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THANKYOU FORUSING THISKLARK TEKNIKPRODUCT
Toobtainmaximumperformancefromthisprecisionelectronicproduct,pleasestudytheseinstructions
carefully. Installingandoperatingtheequaliserisnotcomplicated,buttheflexibilityprovidedbyits
operatingfeaturesmeritsfamiliarisationwithitscontrolsandconnections. Thisunithasbeenprepared
tocomplywiththepowersupplyrequirementsthatexistinyourlocation.
Precautions
Beforeconnectingthisunittothemainspower,ensurethattheoperatingvoltageiscorrectforyourlocal
supply.
Donotinstallthisunitinalocationsubjectedtoexcessiveheat,dustormechanicalvibrations.
SafetyWarning
Thisunitisfittedwith3-pinpowersocket:Forsafetyreasonstheearthleadshouldnotbedisconnected.
Topreventshockorfirehazard,donotexposetheunittorainormoisture.
Toavoidelectricalshockdonotremovecovers. Referservicingtoqualifiedpersonnelonly.

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Afteryouhaveunpackedtheunit
Saveallthepackingmaterials-theywillprovevaluableshoulditbecomenecessarytotransportofship
thisproduct.
Pleaseinspectthisunitcarefullyforanysignsofdamageincurredduringtransportation. Ithasundergone
stringentqualitycontrolinspectionandtestspriortopackingandleftthefactoryinperfectoperatingand
mechanicalcondition.
If,however,theunitshowsasignofdamage,notifythetransportationcompanywithoutdelay. Only
you,theconsignee,mayinstituteaclaimagainstthecarrierfordamageduringtransportation.
Ifnecessary,contactyoursupplierorasalastresort,yourKlarkTeknikimportingagent,whowillfully
co-operateundersuchcircumstances.

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Introduction
Theequaliserisavitalcomponentinanyaudiosystem. Theentiresignalpassesthroughitandsoany
limitations imposed by the equaliser will compromise the performance of the whole system. For
example,anindifferentlydesignedequalisermayintroduceseverephasedistortion,noiseandother
anomoliesrelatedtocentre-frequencyaccuracy,filtershapeandattenuationaccuracywhichmay
manifestthemselvesasanoveralldeteriorationintheperceivedsoundqualityofthesystem. Clearlythis
inanunacceptablestateofaffairs,butfortunatelyyourchoicetoutiliseKlarkTeknikequaliserproduct
willeliminatetheseproblems,offeringyouunprecedentedproductperformancecoupledwiththe
highestfiltercalibrationandreliabilitystandardsintheindustry.
FormanyyearsKlarkTeknikhasbeenattheforefrontofequaliserdesign,andhavecarriedoutdetailed
researchintooptimumfilterresponsecharacteristics,includingtheirsonicperformance.
TheSeries300rangeofequalisersisadirectresultofthisresearch. Itshouldbenotedthatequalisation
cannotalwaysovercomeallfrequencyresponserelatedproblems. Thereareapplicationswherethe
abilitytocutorboosttheresponseataparticularfrequency,oroveracertainbandwidthotherthanthe
equaliserspecifiedone,isrequiredtoovercomeexceptionallydifficultresponseanomaliesornarrow
bandfeedbackproblems. Whensuchaninstanceisencountered,itmaybemoreappropriatetouse
the greater range of control provided by a parametric type equaliser, where the centre frequency,
bandwidthandamplitudeareallcontrollable.
When using an equaliser remember that the need to use large amounts of boost or cut within the
equalisationcurveindicatesthattheremaybesomethingfundamentallywrongwiththesoundsystem
orroomacoustics,whichshouldbefurtherinvestigatedandcorrectedbeforefinalequalisationis
applied.
Boththeinputandoutputcircuitryiselectronicallybalanced.Theinputisvoltageandcurrentmatched
andgivesexceptionalnoise,distortionandCMRperformance,whiletheoutputcircuitryisbasedon
theMidasXL3outputstagegivinghighdrivecapability.
Operationisnormallyfromthemainssupplywiththe24VDCsupplybeingutiliseduponthefailureof
themains.Ifno24Visavailablethentheinternalrelayswillbypasstheunitintheeventofpowerfailure.

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DN330Equaliser
TheKlarkTeknikDN330isasingle channel,30bandequaliseroffering12dBofcutorboostin
1/3octavestepsbetweenthefrequenciesof20Hzand20kHz.
FilterShapeandCombiningAction
Attheheartofanyequaliseristhebankoffiltersusedtoshapethesignalresponse,andKlarkTeknik
utiliseaproprietaryfiltercircuitwhichreplaceswhichreplacestheconventionalinductorbasedcircuit,
atthesametime,offeringseveralperformanceadvantages. Inductorbasedcircuitsareheavy,expensive
toproduceandsufferfromlowfrequencydistortionandinducedhum. KlarkTeknik’sproprietaryfilters
onthecontrarysuffernoneoftheseproblems,yetofferunequalledphaseresponseandcontrolaccuracy
withtheadditionalbenefitsoflownoiseandminimalripple.
Thenature,shapeandwayinwhichindividualequaliserfilterscombine,hasaprofoundeffectonthe
controlprovidedbytheequaliserandontheresultingqualityofsound. Themajorityofapplications
withinthesoundreinforcement,broadcast and recording fields, requireasmoothandcontinuous
equalisationresponsecurveinordertocorrectlycontourtheoverallresponsecharacteristicsofasound
system,loudspeaker,recordingeffectoraudiochannel. Toachievethis,theindividualfiltersmustbe
capableofcombiningsmoothlytogethertoresultinacontinuousresponsecurve,freefromshape
discontinuitiesinordertoavoidunwantedaudiblepeaksofanomaliesinthefinalsound.
Individualchannellevelcontrols,overloadindicatorsandbypassswitcheswithincorporatedlowcut
filtersarefeaturedonthecontrolpanel.
Otherfeatures
Thebypassswitchsilentlyremovesthegraphicequalisersectionsfromthesignalpath. Theequaliser
alsoincorporatesvariablelowandhighpass12dB/octavefilterswitharangefrom2K5Hzto30kHz
and 15Hzto300Hzrespectively.
OtherfeaturesincludeanoverloadLEDperchannel,whichwarnsofimpendingoverloadatanypoint
intheequaliser. Adetachablesecuritycoverisaninherentfeaturetopreventunauthorisedpersonnel
fromtamperingwiththecontrolsettings.
ThisproductisbuilttothesamehighelectricalandmechanicalstandardsasallKlarkTeknikequipment
andisbothrobustandstylish. Itoccupiesastandardoneunitofrackspace and has electronically
balancedinputsandoutputs.

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ReliabilityControl
Evenwiththeadvancedtechnologyincorporatedinthisproduct,eachinstrumentisgiventhefullbacking
ofKlarkTeknik’s“reliabilitycontrol”whichproveseachproductagainstaspecificationconsistentwith
thehighestprofessionalstandards. Onlytopqualitycomponentsareused,andeveryunitisbenchtested
andalignedbeforeaburn-inperiodandfinalperformancetest.