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DPSeries
PowerAmplifier
DIGISYNTHETIC
R
USERMANUAL
PROFESSIONALPOWERAMPLIFIERDP45O
TABLEOFCONTENTS
.Introduction2
2.13
2.23
Welcome
Unpacking
4.Installation
4.1Stereo6
4.2Mono6
4.3AdditionalLoadProtection7
4.4RequiredACMains7
5.Operation
5.1Precautions7
5.2PowerIndicator8
5.3ProtectionSystems8
5.3.1DriveProtection8
5.3.2TransformerthermalProtection8
5.3.3SignalLimitingCircuit9
6.Specifications
9
7.Service
12
Page1
3.Description
3.1Features3
3.2Frontpanel4
3.3Rearpanel4
1.SafetyInstructions 2
Theinformationfurnishedinthismanualdoesnotincludeallofthedetailsofdesignand
engineeringofthisparticularproduct;notdoesitcovereverypossibleapplicationor
situationconcerningitsusage,whichmayoccurduringtheinstallation,operationor
maintenanceofsaidDIGISYNTHETICproduct.
IMPORTANT
THEPRODUCTREQUIRESCLASS2OUTPUTWIRING.
WARNING
TOREDUCETHERISKOFELECTRIC
SHOCK,DONOTEXPOSETHIS
EQUIPMENTTORAINORMOISTURE!
MagneticField
CAUTION: Donotlocatesensitivehigh-gainequipmentsuchaspreamplifiersor
tapedecksdirectlyaboveorbelowthisunit.Becausethisamplifierhasahighpower
density,ithasastrongmagneticfieldwhichcaninducehumintounshieldeddevices
thatarelocatednearby.Thisfieldisstrongestjustaboveandbelowtheunit.Ifan
equipmentrackisused,werecommendlocatingtheamplifier(s)atthebottomofthe
rackandthepreamplifierorothersensitiveequipmentatthetop.
TOPREVENTELECTRICSHOCK,DO
NOTREMOVETOPORBOTTOM
COVERS.NOUSERSERVICEABLE
PARTSINSIDE.REFERSERVICINGTO
QUALIFIEDSERVICEPERSONNEL.
DISCONNECTPOWERCORDBEFORE
REMOVINGREARPANELCOVERTO
ACCESSGAINSWITCH.
ShockHazard-DoNotEnter
ChocHasard-N*entrent
SchockeHazard-TestNicht
Betrete
UrtoHazard-DoNonEntrano
CAUTION
Theexclamationpointtriangleisusedtoalerttheusertoimportantoperating
and/ormaintenanceinstructions.
Printedonrecycledpaper.
Thelightningbolttriangleisusedalerttheusertotheriskofelectricshock
Page2
3Description
3.1Features
Rugged,road-worthyprofessionalpoweramplifier.E.I.A.Standard19"(48.3cm)rack-
mountablechassis.
DPSeries""circuitrygenerateslargevoltageswingswhileavoiding
electricalstressontheoutputstages.Thisresultsinlowdistortionandhighreliability.
Frontpanelpowerswitchwithturn-ondelayforloudspeakerprotection.
PatentedOutputDeviceEmulationProtectionkeepstheamplifierworkingunder
extremeconditions.
Highdampingfactorprovidessuperiorcontroloverlowfrequencydriversforaclean,
accuratelowend.
Safewithanyload.Bridge-MonoandParallel-Monomodesofferoptimalload-
matchingperformance.
Completeprotectionagainstshortedoutputs,mismatchedloads,overheating,DC
input/outputandhighfrequencyoverload,fullinternalfaultprotection.
BalancedXLRinputswithbalanceddirectXLRoutput.Optionalbarrierblockinput
connectorsareavailablewiththePM-BBaccessories.
Efficientheatsinksandself-containedforcedaircoolingsystem,dissipateheat
quicklyandevenlyforextraamplifierprotectionandgreaterpoweroutput.
LogicOutput
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2.1Welcome
ThankyouforchoosingDIGISYNTHETICCO.LTDprofessionalaudioproduct.You
havejoinedagrowinggroupofaudioprofessionalswhohaveturnedto
DIGISYNTHETICforthemostadvancedaudioamplificationproductsavailable.So
welcometotheDIGISYNTHETICfamily!AllDIGISYNTHETICproductshavebeen
designed,engineeredandmanufacturedtomeetthedemandsofeventhemostcritical
soundreinforcementprofessional.
Pleasereadthismanualcarefully.Itcontainsimportantandhelpfulinformationtoenable
youtogettheDIGISYNTHETICperformanceoutofyournewproduct.Ifyouplantouse
thisamplifierineitherofthe2availableMonomodes,pleaserefertosection2.2
Pleaseunpackandinspectyournewamplifierforanydamagethatmayhaveoccurred
duringtransit.Ifdamageisfound,notifytheTransportationCompanyimmediately.Only
you,theconsignee,mayinitiateaclaimwiththecarrierfordamagewhichoccurred
duringshipment.Remembertosaveallpackingmaterialsintheunlikelyeventyourunit
shouldeverneedtobereturnedtothefactoryforserviceofanykind.
2Introduction
1.1Unpacking
Page3
3.2Frontpanel
3.3Rearpanel
Page4
PowerSwitch
Ch2.LevelControlCh1.LevelControl
CH.1 CH.2
Indicators
Power
cord
BindingPostandSpeakon
OutputConnectors
1-Ch.1OutputInput
2-Ch.2OutputInput
MODESWITCH
AC220V10%/50Hz-60Hz±
4Installation
Installation
IMPORTANT!ALLOWFORADEQUATEVENTILATION.
Alwaysreducevolumebyturninglevelcontrolsfullycounterclockwisewheneither
connectingordisconnectingcablestotheamplifier.Thisreducesthechanceofan
audio"spike"thatcouldpossiblycauseloudspeakerdamage.Theguidelinesbelow
areprovidedtohelpyougetyouramplifierinstalledandreadytogoquicklyand
easily.BesuretofollowtheinstructionsinSections2.1and2.2fortheselected
modeofoperation.Additionalinformationoninputsensitivity,loadprotectionand
requiredACmainsisprovidedinSection2.3.
1.Installtheamplifierinastandard19-inch(48.3cm)rack,orplaceitonastable
surface.Themountingdimensionsare19-inch(48.3cm)wide,3.5-inch(8.9cm)tall
and17.7-inch(44.9cm)deepbehindthemountingsurface.
AMPLIFIER
(TOPVIEW)
IMPORTANT:Besurethebackof
theamplifierissupported
AIRFLOWAIRFLOW
AIRFLOW AIRFLOW
43.5cm
FRONTOFAMPLIFIER
Fig.2.4BlockAirFlowDoNot
Page5
2.Usehigh-qualityloudspeakercablestoconnecttheloadtotheamplifier'soutputs.Donotuseshieldedcable.
3.Useshieldedcablestoconnectaudiosourcestotheamplifier'sinputs.Eitherbalancedorunbalancedwiringcanbeused
asshownbelow.(BarrierblockinputconnectorsareavailablewiththePM-BBaccessories).
BALANCED
1
23
GND
+
SHIELD
+
INPUT FROM
PREAMPLIFIER
INPUT
2
1
SHIELD
PREAMPLIFIER
UNBALANCED
+
SHIELD
+
3
FROM
-
-
4.1Stereo
.2Mono
1.Turndownthelevelcontrols(fullycounterclockwise)and
2.SetthebackpanelStereo/MonoswitchtoStereo.
3.Connecttheinputandoutputcables.
4.Turnontheamplifierandadjustthelevelforeachchannelusingthefrontpanellevel
controls.
Youramplifier'sMonomodesprovidedoublethepoweroftheStereomodeinasingle
channel.InBridge-Monomode,theoutputsarewiredfortwicetheoutputvoltage.In
Parallel-Monomode,theinputsareparalleledtolinkthetwochannels.Bridge-Mono
modeisprovidedforloadswithimpedancegreaterthan4Ohms.Parallel-Monomode
shouldbeusedwithloadsof4Ohms.
1.Turndownthelevelcontrols(fullycounterclockwise)and
2.SetthebackpanelStereo/MonoswitchtoBridge-Mono.
3.Connecttheinputandoutputcables.
4.Makesuretheloadisbalanced(neithersideshortedtoground)andusethe
black(-)
bindingposts.
5.Turnontheamplifierandadjustbothlevelcontrols.
1.Turndownthelevelcontrols(fullycounterclockwise)and
turnofftheamplifier.
Bridge-Mono turnofftheamplifier.
Onlychannel1inputisused.
donot
Parallel-Mono turnofftheamplifier.
4
Page6
3.ConnecttheinputandoutputcablesasshownintheOnlychannelinputisused.
4.Turnontheamplifierandadjustbothlevelcontrols.
Toprotectagainstexcessivepower,afusecanbeaddedinserieswitheach
loudspeakercable.Asinglefusecanprotecttheentiresystem,orcanbeusedforeach
driver.Highfrequencydrivers(tweeters)areusuallymoresensitivetolargevoltage
peaks,whilelow-frequencydrivers(woofers)aretypicallymostsensitivetotheheatfrom
averageRMSoutputpower.Toprotectyourtweeters,werecommendthatyouusea
high-speedinstrumentfuseliketheLittlefuse361000series.Toprotectyourwoofers,
werecommendusingaslow-blowfusethatmorecloselyrepresentsthethermal
responseofyourwoofer.UseFigure2-6tofindthecorrectvalueforeithertypeoffuse.
AllDPSeriesamplifiersareshippedwithanappropriatelinecordandplug.When
possible,useapowerreceptacleonadedicatedcircuit;andalways,makesureitwill
providethecorrectvoltageandsufficientcurrent.Wedonotrecommendoperatingyour
amplifierwithvoltagesgreaterthan10%aboveorbelowtheunit'sratedvoltage.For
example,ifyouramplifierisratedfor220VAC,thelinevoltageshouldnotexceed240
VAC.
CAUTION:Connectunitonlytoapropersupply.Useonlythreewirecordwhichis
providedwithunit.
CAUTION:Neverstrapthetworedoutputterminalstogether(inparallel).Never
connecteitherredoutputterminaltochassisground.
IMPORTANT:Thechannel2levelcontrolwillremainilluminatedwhenoperatingin
Parallel/M-onomode.
4.3
4.4
AdditionalLoadProtection
RequiredACMains
Page7
5.operatinginstruction
Althoughyouramplifierisprotectedfromexternalfaults,thefollowingsafetyprecautions
arerecommended:
1.ThereareimportantdifferencesamongtheStereo,Bridge-MonoandParallel-Mono
operatingmodes.PleaserefertoSection2foradditionalinformation.
2.:
3.Usecarewhenmakingconnections,selectingsignalsourcesandcontrollingthe
outputlevel.
5.1Precautions
WARNINGDonotchangethepositionofthestereo/monoswitchunlessthe
amplifierisfirstturnedoff.
CAUTION:Neverstrapthetworedoutputterminalstogether(inparallel).Never
connecteitherredoutputterminaltochassisground.
Also,makesuretheStereo/Monoswitchissettotheproperposition.
4.Donotshortthegroundleadofanoutputcabletotheinputsignalground.Thiswill
formagroundloopandmaycauseoscillations.
5.DonotoperatetheamplifierfromACmainsinexcessof10%variationaboveorbelow
theselectedlinevoltage,andonlyatthespecifiedlinefrequency.
6.Neverconnecttheoutputtoapowersupplyoutput,batteryorpowermain.Such
connectionsmayresultinelectricalshock.
7.Tamperingwithcircuitrybyunqualifiedpersonnelormakingunauthorizedcircuit
changesmaybehazardousandinvalidateswarranty.
Whenilluminated,thegreenpowerindicator(thevolumecontrol)showsthatthe
amplifierhasbeenturnedon.Itisdrivenonlybythelow-voltagepowersupplyand
doesnotindicatethestatusofthehigh-voltagesupply.
DPSeriesamplifiershaveextensiveprotectionsystems,includingTPC,protection,
driveprotection,transformerthermalprotection,andfusesorcircuitbreakersthat
protectthepowersupplies.
RememberDIGISYNTHETICAudioINC.,isnotliableforanydamagethatresultsfrom
overdrivingothersystemcomponents.
5.2PowerIndicator
.3ProtectionSystems5
5TheDriveProtectionSystemtemporarilyremovesoutputdrivetoprotectthe
amplifieranditsloads.DriveProtectionSystemcanbeactivatedintwosituations.
First,ifdangeroussubsonicfrequenciesordirectcurrent(DC)isdetectedinthe
amplifier'soutput,theunitwillactivateitsDC/low-frequencyprotectioncircuitry,which
putstheamplifierinDriveProtectionmode.Thismodeprotectstheloadsand
preventsoscillations.Theunitresumesnormaloperationassoonastheamplifierno
longerdetectsdangerousoutput.AlthoughitisextremelyunlikelythattheDC/low-
frequencyprotecti-onsystemwilleverbeactivated,impropersourcematerialslike
subsonicsquarewavesorinputover-loads,thatexcessivelycliptheinputsignal,can
activatethissystem.
.3.1DriveProtection
Theamplifier'sprotectionsystemwillactivatetheamplifier'sDriveProtectionmode
inraresituationswhereheavycommon-modecurrentisdetectedintheoutput.The
unitshouldneveroutputheavycommon-modecurrentunlessitscircuitryis
damaged.ActivatingDriveProtectionmodehelpspreventfurtherdamage.
5.3.2
AllDPSeriesamplifiershaveTransformersThermalProtection.Thisprotectionis
activatedinunusualsituationswheretheunit'stransformertemperaturerisesto
unsafelevels.Undertheseabnormalconditions,theunitwillremovesoutputdrive
toprotectamplifier..Thefanwillcontinuetoruninallunits.Theamplifierwillreturn
tonormalafteritcoolstoasafetemperature.I
TransformerThermalProtection
tisveryunlikelythatyourDPSeries
amplifierwilleveractivateitsTransformerThermalProtectionaslongasitis
operatedwithinratedconditions.
Page8
5.3.3SignalLimitingCircuit
OutputPower:
Thisinternallimitingcircuitautomaticallyreducegainbecauseofasignificantdeviation
betweeninputandoutputsignalflow,preventingoccurrenceofgrossnon-linearity
conditionsinsidetheamplifiercausedbyoverdrive,overloadordefect,andkeepsthe
signalshapeunalteredunderanyconditions.Thecircuitkeepsignalflowdistortion
under0.5%,andthusguaranteescleansoundandeffectivespeakonprotection.
Allamplifierspecificationsapplytothefollowingsettings:Stereomodewith8-ohmloads
andaninputsensitivityof32dB,unlessotherwisespecified.
Thefollowingspecificationsareguaranteedminimumsforstandard1
kHzpower.Formoreinformation,seethepowermatrixinFigures3.1through3.2
(DIGISYNTHETICimumaveragepower@0.1%THD+N).
6.Specifications
PowerSpecification
LoadImpedance:
RequiredACMains:
ACConnector:
Controls
Power:
Level
Safewithalltypesofloads.Ratedat4to8ohmsinStereo,4to
8ohmsinBridge-Monoand4to8ohmsinParallel-Monomode.
Current,frequencyandvoltagerequirementsareprovidedon
eachunit'sbackpanel.Allmodelsdraw90Wattsorlessatidle.
Drawsupto10ampsofcurrent.
AnappropriateAClinecordandplugareprovided.110/220VAC,
50Hz/60Hzunitshaveastandard3-wire,15-ampgroundedconnector(NEMA5-
15P).
Afrontpanelrockerswitchisusedtoturntheamplifieronandoff.
:Afrontpanelrotarypotentiometerforeachchannelisusedtocontroltheoutput
level.
DP450:(220/50Hz)
Fig.2.2TPC
Fanspeed
DIGISYNTHETIC.fanspeed
TemperatureProtectCircuit(TPC)
Automatic
c
c
c
0
20
10
c
c
c
c
40
30
60
50
Min.fanspeed,
TPCnormal
At75C°
60
Heatsinktemperature
c
c
c
80
70
90
Amplifier:DPSeries
TPCLimiteractive
C
80 C
90 Mutethesignal
Outputthesignal
C
Fig.2.1FrontPanelLevelControl
ThefollowingdiagramillustratestheactionstakenbytheThermal
ManagementSystem:
Page9
CHANNEL2
LEVELCONTROL
CHANNEL1
LEVELCONTROL
Stereo/Mono:
Input/OutputData
InputConnector:
InputImpedance
OutputConnector:
OutputImpedance:
DCOutputOffset:
OutputSignalModes
Stereo:
Bridge-Mono:
Parallel-Mono:
Protection
TurnOn:
Construction
Cooling
Athree-positionbackpanelswitchisusedtoselectStereo,Bridge-Mono
orParallel-Monomode.
BalancedXLRconnector.
:Nominally20kohms,balanced;10kohms,unbalanced.
Twosetsofcolor-coded5-waybindingposts(forbananaplugs,
spadelugsorbarewire)andtwosetsofspeakonconnectors.
Lessthan10milliohmsinserieswithlessthan2microhenries.
Lessthan10millivolts.
Balanced,two-channel.
Balanced,single-channel.Channel1inputsareactive;Bothchannel
volumecontrolsareavailable.
balanced,single-channel.Channel1inputsareactive;Bothchannel
volumecontrolsareavailable.
DPSeriesamplifiersareprotectedagainstshortedcircuitsormismatched
loads,overloadedpowersupplies,excessivetemperature,chaindestruction
phenomena,inputoverloadandhighfrequencyblowups.Theyalsoprotect
loudspeakersfrominputandoutputDCandprovideprotectionfromturn-on/turn-off
transients.
Ifoperatingconditionsareunreasonable,thepatentedcircuitryproportionallylimitsthe
driveleveltoprotecttheoutputtransistors,particularlyinthecaseofelevated
temperature.Athermalswitchimbeddedontheheat-sinkprotectstheoutputdevice
fromoverload.Intherareeventthatatransformeroverheats,thethermalswitchturns
thepoweroff,waitsuntiltheunithascooledtoasafetemperatureandthenresetsitself.
Fiveseconddelaywithnodangeroustransients.ContactDIGISYNTHETIC
AudioInc.ifyouneedtochangethedelay.
Durableblackfinishonsteelchassiswithspecial"flow-through"ventilationfromrear
paneltofrontpanels.
:Internalheatsinksandtwo80mmhighspeedlownoisecoolingfanwithauto
speed-controlforced-aircoolingforrapid,uniformheatdissipation.
Page10
Inanefforttoprovideyouwithasmuchinformationaspossibleaboutthehigh
power-producingcapabilitiesofyouramplifier,wehavecreatedthefollowing
powermatrices:
needtochangethedelay.
~220V50/60Hz
FUSE:T10A FUSE:T12A FUSE:T15A
DP450
300W
500W
900W
300W
500W
20Hz-20kHz+/_0.5dB
+/_0.1degreesfrom10Hzto20kHzat1watt
>60dB
+0dB/-0.3dBfrom20Hzto20kHzat1watt
≤Ω
0.01%RatedPower@81kHZ
≤Ω
0.01%RatedPower@8
>98dB
40v/s(Stereo)
μ
>300@1kHz/8ohms
10K/20Kohms,unbalancedorbalanced
56cmx47cmx15cm
Dimensions:(
ApproximateWeight:
Standard56cmrackmountwidthElARS-310-B),15cmheightand47
cmdepthbehindthemountingsurface.
Centerofgravityis10inches(25.42cm)behindfrontmounting
surface.
Page11
5.Service
Topreventelectricshock,donotremovecovers.Nouserserviceableparts
inside.Referservicingtoaqualifiedtechnician.
5.1WorldwideService
Thisunithasverysophisticatedcircuitryandshouldonlybeservicedbyafullytrained
technician.
Thisiswhyeachunitbearsthefollowinglabel:
Servicemaybeobtainedfromyourlocalauthorizedagent.Toobtainservice,simply
presentyoursalesreceiptasproofofpurchasealongwiththedefectiveunittoan
authorizedagent.Theywillhandlethenecessarypaperworkandrepair.Rememberto
transportyourunitintheoriginalfactorypackaging.
1.Toensurethesafetransportationofyourunittotheauthorizedagent,shipitinan
originalfactory-packingcontainer.
2.shiptheunitinanykindofrack.Ignoringthiswarningmayresultinextensive
damagetotheunitandtheequipmentrack.Accessoriesarenotneeded.Donotsend
theinstructionmanual,cablesandanyotherhardware.
Donot
Page12
CAUTION
/
