OS DB7 Manuel utilisateur

User Guide

DB7

Contents

 ImportantSafetyInstrucons......................................Page3

 Introducon.................................................................Page5

 Operaon.....................................................................Page7

 ConnectorsandControls..............................................Page8

 DSPPresets..................................................................Page9

 Linear-PhaseTimeAlignment......................................Page10

 MonitorPlacement......................................................Page12

 TechnicalSpecicaons...............................................Page14

 WarrantyandService..................................................Page15

 ContactUs...................................................................Page16

• Readandfollowtheseinstruconscarefully,andretainthemforfuturereference.

• The DB7 is heavy (~12kg). Please take care when liing!

• Takecareunpackingyournewmonitors,beingcarefulnottotouchthedriveunits

• Pleaseretainthepackagingforsafetransportaoniftheneedforservicingarises.Ensure

packagingisstoredordisposedofsafelytoavoidposingarisktotheyoungandvulnerable.

• Donotusethisapparatusnearwater.

• Cleanonlywithadrycloth.Thecabinetnishmaybedamagedbysolvents,abrasives,waxes,

orliquids.

• Donotinstalltheloudspeakernearanyheatsourcessuchasradiators,heatregisters,stoves,

orotherapparatus(includingampliers)thatproduceheat.

• Donotcovertheheatsinkontherearpanel,orblockanyvenlaonopenings.

• Protectthepowercordfrombeingwalkedon,orbeingpinchedordamagedinanyotherway.

• Donotdefeatthesafetypurposeofthepolarizedorgrounding-typeplug.Apolarizedplughas

twobladeswithonewiderthantheother.Agroundingtypeplughastwobladesandathird

groundingprong.Thewidebladeorthethirdprongisprovidedforyoursafety.Iftheprovided

plugdoesnottintoyouroutlet,consultanelectriciantoreplacetheobsoleteoutlet.

• Apowerswitchislocatedontherearoftheloudspeaker.Themainscordisusedasamains

disconnectdeviceandshouldremainaccessibleatallmes.

• Unplugthisapparatusduringlightningstorms,orwhenunusedforlongperiodsofme.

• Donotplacetheproductonanunstablecart,stand,tripod,bracket,ortable.Thedevicemay

fall,causingseriousinjury,andseriousdamagetothedeviceitself.

• Onlyuseaachments/accessoriesspeciedbythemanufacturer.

• Referallservicingtoqualiedservicepersonnel.Servicingisrequiredwhentheapparatus

hasbeendamagedinanyway,includingbeingexposedtorain,spiltliquids,ormoisture,ofif

objectshavefallenintoit,ortheapparatushasbeendropped,orifthereisadisnctchangeof

audioperformance,oriftheunitdoesnotoperatenormally.

• VerypowerfulmagnetsareemployedintheDB7whichmayhaveadetrimentaleecton

magnecally-sensiveitemsandrecordingmediaifplacedtooclose.

• TheDB7isaprecisionaudiomonitoringtoolcapableofproducinghighsoundpressurelevels.

ImportantSafetyInstrucons

Exposuretohighlevelsofsoundovermehasthepotenaltocausehearingdamage.Use

carewhenadjusngthesystemvolumetoensuresoundpressurelevelsremainwithinsafe

andcomfortablelimits.

• Make sure that the audio source volume is set to minimum before powering the DB7 to

prevent sudden high sound levels. Failure to follow these instrucons may result in damage

to your hearing or to the DB7.

• O.SAcouscshasmadeeveryeorttoprovideaccurateinstallaoninformaonandgood

qualityxings.However,itwillnotbeheldresponsibleorliableforinjuriesorpropertydamage

(direct,indirect,orconsequenal)arisingoutoftheuse,orinabilitytousethisproductsafely

andproperly.

ImportantSafetyInstrucons

ThankyouforchoosingOSAcouscsDB7acvereferencemonitors.

TheDB7isconstructedusingcomponentsofthehighestqualityand,withtherightcareand

aenon,yournewloudspeakerswillprovidemanyyearsofexcellentaudioreproducon.

Asophiscateddigitalsignalprocessing(DSP)systemisbuiltintotheDB7toprovidea

newstandardinmingcoherenceandaccuracy.Designedwithacousctransparencyasa

priority,OSAcouscsDB7faithfullypreservesphaserelaonshipstopresentathree-dimensional

soundstage,andreproduceseverymbraldetailandharmonicnuancewithstunningrealism.

ProprietaryUMAC™Class-Dampliertechnologyfrommarket-leadingmanufacturerPascalAudio

oersunparalleled,extremeaudiophilesonicperformance,andboastsofthebestmeasurable

specicaonsinthemarket.TheDB7enjoysatotalof650Was(RMS)ofultra-lowdistoron

amplicaon,anditsabilitytodeliververyhighshort-duraonpowerburstsgivestheDB7an

exceponaltransientresponse.

ToguaranteemaximumreliabilitytheDB7alsofeaturesahighlyecientswitch-modepower

supplywithUREC™power-factorcorrecontechnology.ItsupportsuniversalACmainsoperaon,

ensuringconsistent,regulatedpowerworldwide,eliminangsuscepbilitytolocalpower-related

reliabilityissues.

Precision

Eachindividualloudspeakerdriveunitismeasuredduringproducon,andanyresponsedeviaons

arecorrectedbytheDSPtoaverynetolerance.Thisallowsanaccuratefrequencyandphase

responsecontrolledtoalevelofprecisiononlyobtainableusingDSP,providingtheDB7with

outstandinglinearity.

Itisessenalthatloudspeakershaveverycloselymatchedfrequencyresponsesforaccurateand

stableimagingincricalstereoandsurroundsoundapplicaons.Matchingindividualmonitorsso

preciselygivestheaddedadvantageofinterchangeabilitysothat,intheunlikelycaseofamonitor

breakdown,anotherDB7monitorcanbesubstutedwithcompletecondence.

Introducon

Frequency&PhaseResponse

ThepowerfuldigitalsignalprocessingbuiltintotheDB7enablesanalmostperfectlyaton-axis

frequencyresponse,asillustratedbelow(le-handscale),withanamplitudevariaonwithin±2dB,

and matchingbetweenanytwoloudspeakersofbeerthan0.5dB.

Digitalsignalprocessingalsoallowstheloudspeaker’sphaseresponsetobemaintainedwithin

ghttolerancesacrosstheenreaudiobandwidth,asshownbelow(right-handscale).Thephase

toleranceismaintainedwithin±15degreesbetween200Hzand20kHz.

Yourloudspeakersshouldprovidemanyyearsoftrouble-freeoperaonwithnormalusage.

However,intheunlikelyeventthatyoususpectdamageorfailurehasoccurred,donotaemptto

repairtheunityourself.Openingorremovingcoversmayexposedangerousvoltagesorotherhazards.

Theamplierchassismayonlybeopenedbyqualiedpersonnel.Therearenouser-serviceableparts

inside.Pleasecontactyourdealerforadviceandaservicereturnaddress.

Cleantheloudspeakercabinetsonlywithadryandlint-freecloth.Theuseofsolventsorabrasive

cleanersshouldbeavoidedastheywilldamagethenishofthecabinet.

Breaking-in Time

Ittakesmeforthemovingpartsofthetransducerstorelaxaermanufactureandreachopmum

compliance.Asaresult,youwillnoceasignicantimprovementinthesoundqualityaeraperiodof

useofabouteighthours,withgreaterbassextensionandamoreneutraltonality.Addionally,more

subtleenhancementswillbenocedduringtherstweekofuse.

Standby Mode

TheDB7willswitchtoapower-savingstandbymodeautomacallyifnosignalhasbeendetectedfora

periodof15minutes.Thestandbymodeuseslessthan0.2Was,makingitEnergyStarcompliantand

inaccordancewiththeErP(1275/2008/EC)direcve.

Thesystemwakesfromthisstandbymodeautomacallywhenanaudioinputsignalisdetected,

typicallyregainingnormaloperangstatuswithin660milliseconds.Dependingonthesourcematerial,

youmayndoneloudspeakerwakesfraconallybeforetheother,orthatslightlymoresignallevelis

requiredtoreachthe‘wake-up’thresholdandre-acvatetheloudspeakers.

Limiter

TheDB7’sDSPsystemincorporatessophiscatedlimitersdesignedtoprotectthetransducersfrom

damagebyover-excursion.Theyalsokeepthevoice-coiltravelwithintheopmumworkingrange,and

avoidthermaloverload.AnLEDontherearpanelilluminateswhentheprotecvelimiterisacvated.

Operaon

Connectors and Controls

1.Power–illuminatesgreenwhenthemonitor

isreceivingmainspower.

2.Limit–illuminatesorangewhenthelimiteris

acvated.

3.Signal/Clip–illuminatesbluewhenanaudio

signalispresentandaboveapresetthreshold.

TheiIlluminaonchangestorediftheinput

levelreachestheclippingpoint.

4.InputGaincontrol–Providesanadjustable

sensivityrangeof-30dButo0dBu.Itis

recommendedtooperatetheloudspeakerswith

thecontrolatthe0dBuposionwherepossible,

controllingthevolumefromthesoundsource.

5.PresetSelectcontrol–Eight-posionrotary

switch.See‘DSPPresets’formoreinformaon.

6.AnalogueaudioinputfemaleXLRconnector.

7.LinkOutputmaleXLRconnector.

8.DualRJ45dataconnectorsformanufacturer

accessonly.

9.IECmainsinlet:85to265VAC,50/60Hz

10.Poweron/oswitch.

1 4

9 10

Preset Select Control Summary

Preset Response LP RBC Preset Response LP RBC

1Flat 5Flat X

2Voiced 6Voiced X

3Flat X 7 Flat XX

4Voiced X 8 Voiced XX

TheDB7canbeconguredfordierentinstallaonsituaonsandpreferencesusinganyofeight

factory-programmedDSPpresets.Thesearerecalledusingthe‘PresetSelect’rotaryswitchatthe

rearoftheloudspeakernearthetopoftheamplierchassis.

Preset 1providesanopmally‘Flat’response(±2dB).Thismodeisdesignedforcompleteaccuracy

anddeliversanincrediblyneutral,uniformfrequencyresponse.

Preset 2isa‘Voiced’seng,whichisnotasaccurateasPreset1,butdeliversaslightlysmoother

andmorerelaxedacouscpresentaon.

Preset 3isalinear-phaseversionofPreset1(Flat).

Preset 4 isalinear-phaseversionofPreset2(Voiced).

Loudspeakersarenotnaturallylinear-phase,whichmeansthatthereproduconoflow

frequenciesisinherentlyslightlydelayedcomparedtohighfrequencies.Presets3and4

imposealinear-phaseresponsetorealignthemingcoherencebetweenallfrequencies.This

enhancesspacialinformaon,renestransients,andimprovestherelaonshipbetweenthe

fundamentalsandharmonicsofinstruments.Thelinear-phasemodeisconguredtoworkbest

whenlisteningonthedirectaxisofthetweeter.

NOTE:Allofthelinear-phasemodesimposeanaddionalve-millisecondprocessingme

throughtheDSP.

Preset 5isthesameasPreset1(Flat),butwithRoomBoundaryCorrecon(RBC)applied.

RBCcanbeselectedtocounterthebass-loadingeectontheloudspeakerduetotheproximity

ofoneormorelocalboundaries.Generallyspeaking,thecloseraloudspeakeristoawallorto

thecornerofaroomthemorethelowfrequenciesareboosted.TheRBCmodecompensates

forthiseectbyreducingthelow-frequencyoutputfromtheloudspeaker.

AnotherfactoraecngthechoiceofwhetherornottouseRBCcouldbe‘roommodes’which

causereinforcementsandcancellaonsofthelow-endresponseatdierentpointswithin

theroom.Allroomsaectthereproducedsounddierently,andsoRBCmightnotalwaysbe

neededevenifthemonitorsareposionedinthecornersofaroom.Pleaseexperimenttosee

whatmodeworksbestinyourspeciclisteningenvironment.

Presets 6 (Voiced), 7(L-PFlat), and 8(L-PVoiced)allhaveRBCapplied,butareotherwisethesame

asPresets2,3and4,respecvely.

Asummarytabledenongallofthedierentpresetoponscanbefoundonpage8.

DSPPresets

Linear-PhaseAlignment

Phase

Allsoundfrequenciestravelatthesamespeedthroughair,maintainingacoherentarrivalme

atthelisteningposion.Unfortunately,though,thesamecannotbesaidofaudiothatisplayed

backthroughaloudspeakersystem.Virtuallyallloudspeakersintroducephaseerrors,distorng

themingcoherencesothatsomefrequenciesaresmearedacrossmeanddelayedcomparedto

others.Thiscanbethoughtofasafrequency-dependentdelay.

Accuracy

Toreproduceacomplexwaveformprecisely,theplaybackdeviceneedstoperformaccurately

inboththefrequency-domain(sothateachpitchisrecreatedatthecorrectamplitude)andthe

me-domain(sothateachnotearriveswhenitshould).Thelaerrequirestheloudspeakerto

maintaintheoriginalphaseormerelaonshipsbetweendierentsoundcomponentsasclosely

aspossible.

Coherence

Correconofthesefundamentalme-alignmentproblemsinconvenonalloudspeakersisn’t

praccaloraordableusinganaloguetechniques.However,theadvanceddigitalsignalprocessing

employedintheDB7allowsthephaserelaonshipsandmingcoherenceofthesourceaudiotobe

properlyandpreciselyrestored.

A New Standard

Theme-domainresponseofaloudspeakercanbeunderstoodbyexaminingwhathappensto

aperfectspike-likesignalofveryshortduraon,knownasaunitaryimpulse(Diracdelta)which

containsallfrequenciesalignedinaxed,uniformphaserelaonship.Thisistheme-domain

equivalentofaperfectlyatfrequencyresponse.Themeasuredoutputfromaloudspeaker

reproducingthisunitaryimpulseiscalleditsImpulseResponse.

Thele-handgraph(redtrace)onthenextpageshowsaloudspeaker’suncorrectedimpulse

responsewhichhasbeensmearedoutintime.Incontrast,theright-handgraph(yellow

trace)showstheimpulseresponseaerphase-correconhasbeenapplied.Theimpulseisoset

towardstheright-handsideofthegraphbecauseofthevemillisecondprocessinglatencyinher-

entinachievingalinear-phaseme-domainresponse.However,theimportantpointisthatthe

smeared-outcharacteriscseenintheuncorrectedimpulseresponsehasbeenremoved,andthe

correctedme-domainresponsemoreaccuratelyrepresentstheunitaryimpulseinputsignal.

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