Coda S20 Amplifier User manual

Coda
Brand
Coda
Model
S20 Amplifier
Category
Audio amplifiers
Type
User manual
CARE&HANDLING
WARRANTY REGISTRATION
WARRANTY & DISCLAIMER
OPERATION MANUAL
AmplifierS20
3
8
12
11
4
INITIAL SETUP
DETAILED INSTALLATION
DESIGN PHILOSOPHY
13
TECHNICAL DATA
2
INTRODUCTION
14
1
SAFETY PRECAUTIONS
CODA TECHNOLOGIESINC. PRECISIONBIASCLASS AB AMPLIFIER
RCA/YL
XLR/GNLEFT RIGHT
20
!
CAUTION
CAUTION
WARNING
WARNING
1
SAFETY PRECAUTIONS
CAUTION -
-
-
-
-
CAUTION: TOPREVENT ELECTRIC
SHOCK,DONOT REMOVECOVER.
NOUSERSERVICEABLEPARTS
INSIDE,REFERSERVICING TO
QUALIFIEDSERVICEPERSONNEL.
THISSYMBOL IS TO ALERT YOUOF
THEPRESENCEOFUNINSULATED
DANGEROUSVOLTAGEWITHIN THE
UNIT'SENCLOSURE THAT MAY BEOF
SUFFICIENT MAGNITUDE TO
CONSTITUTE A RISKOFELECTRIC
SHOCK.
THISSYMBOL ISINTENDED TO ALERT
YOUOF THEPRESENCEOF
IMPORTANT OPERATING AND
MAINTENANCEINSTRUCTIONSIN THE
LITERATURE ACCOMPANYING THE
UNIT.
WARNING:TOPREVENT FIREORSHOCKHAZARD,DO
NOT EXPOSE THISUNIT TORAINOR
MOISTURE. TO AVOIDELECTRICAL SHOCK,DO
NOT OPEN THEUNIT.REFERSERVICING TO
QUALIFIEDPERSONNEL.
Neverinstallorremovethepowercordfromthechassis
unlessithasbeendisconnectedfromthe ACpowersource
first.
Neverpullonthepowercordwhenremovingitfroman AC
powersource.Graspitbytheplug.
Donotleavethepowercordconnectedtoan ACpower
sourceunlessitisconnectedtotheunit.
Itisrecommendthatduringextendedperiodsofnon-use
thattheunitspowercordbeunpluggedfromits ACpower
source.
Routethe ACpowercordsothatitwillnotbedamagedor
walkedon.
!
2
INTRODUCTION
Thankyouforpurchasingthe AMPLIFIERS20.
Thisamplifierisaprecisiondevice,designedinanefforttoprovidethelistenerwith
unmatchedsoundqualitythroughsuperbdesignandconstruction.
Althoughitsoperationisfairlysimple,inordertooperateyouramplifierproperlyandto
realizeallofthecapabilitiesoftheS20werecommendthatyoureadthisentiremanual
carefully.
3
INITIAL SETUP
Thediagrambelowshowsthedefaultconnectionsnecessarytooperatethe AMPLIFIERS20
asastereoamplifier. Thisisthesimplestandmostcommonmodeofoperation,andthe
quickestwaytogetstarted.
WARNING:PleaseensurethatthepowerswitchisturnedOFFwhileyouareconnecting
theamplifier.Connectingordisconnectingcableswhiletheamplifierispoweredoncould
causedamagetoyourspeakers.
Note:EnsurethattheMODEswitchlocatedbetweentheinputjacksontherearofthe
amplifierissettotheSTEREOpositionfornormaloperation.Bridgedoperationisexplained
onpage7.
4
DETAILEDINSTALLATION
I.Connections
Theconnectorsandcontrolsareclearlymarkedonthebackpanelofthe AMPLIFIER.Note
thecorrectleftorrightchannelorientation. Thefunctionandchannelmarkingsontherear
panelcorrespondtothefrontpanelcontrolsandtheirsignalpaths.
1.TheUNBALANCEDandBALANCEDinputsshouldbeattachedtotheappropriate
unbalancedandbalancedoutputsofapreamplifiereitherdirectlyorthroughacrossoveror
processor,asappropriatetotheapplication.
2.TheLEFT OUTPUT andRIGHT OUTPUT shouldbeattachedtotheleftandrightspeakers.
WARNING: Therearenofusesontheamplifier’soutputsinordertocutdownonoutput
impedanceeffects.Speakerprotectionislefttothemanufacturerofyourspeakers,asthey
wouldbestknowhowtoprotecttheirproduct.
3.The ACLINEINPUT shouldbeconnectedtoan ACoutletwiththepowercableprovided
withtheamplifier.
4.TheFUSE ANDVOLTAGESELECTORunithousesa5x20mmslow-blowfuseanda
voltageselectorcartridge.Ensurethatthevoltage,visiblethroughasmallwindownexttothe
ACinput,issettotheappropriatevoltageforyourcountry.Whenchangingvoltages,ensure
thatthepowercableisdisconnectedfromtheamplifier.
Note:Ifthefuseinyouramplifierblows,contactaCodadealerorcallCodadirectlybefore
attemptingtousetheamplifieragain.
5.ThePOWERSWITCHcanusuallybeleftonwhentheamplifierisfunctioningcorrectly.
Withthebiasdisabledtheamplifierwilldrawnegligiblecurrentandcanthusbeleftin
“standby”indefinitely.
5
DETAILEDINSTALLATION
II.FrontPanelControlFunctionsandIndicators
1. TheBIASbuttonenablesthebias,effectively"turningon"theamplifier'scomponents,and
opensshuntingrelaysthatmutetheinput.
2. TheINPUT SELECTORbuttonswitchesbetweenthebalancedandunbalancedinputs.
3. TheseLEDs,whenlit,indicatethatthebiasisenabledandmutingisoff.
4. ThistwocolorLEDindicatesthatthemainpowerison.Whenitisredthebalancedinputs
areinuse.Whenitisyellowtheunbalancedinputsareinuse.
Note:Ifapowerinterruptionoccurstothesystemtheamplifierwillpoweronwiththebias
off.PresstheBIASbuttontoresumeuseoftheamplifier.
CODA TECHNOLOGIESINC. PRECISIONBIASCLASS AB AMPLIFIER
RCA/YL
XLR/GNLEFT RIGHT
20
6
DETAILEDINSTALLATION
TheS20normallyoperatesinstereomode,providingamaximumoutputpowerof10watts
Class A (intoan8-ohmload)perchannel.InBRIDGEDmode,bothchannelsactasone
amplifierprovidingamaximumoutputpowerof800watts.Forextremelyhigh-powermulti-
channelaudioapplications,multipleS20amplifierscanbeusedinplaceofonemedium-
powerstereoamp.
Toconfiguretheamplifierforbridgedmodeoperation,setthemodeswitchonthebackpanel
totheBRIDGEDsettingasshowninthediagrambelow.
III.BRIDGEDSETUP
WARNING:Disconnecttheamplifier'spowercordfromthe ACsupplyandsetthepower
switchtoOFFbeforeadjustingthemodeswitchorconnectingordisconnectinganycables
toavoidpotentialdamagetoyourspeakers.
Inbridgedmodeonlyoneaudioinputisused.Nootherinputshouldbeconnected,andthe
bridgedmodeinputmustbeaBALANCEDsignalconnectedtotheXLRreceptaclelabeled
BRIDGEDINPUT.Bridgedmodewillnotoperatecorrectlywithaninputadaptedfroman
unbalancedsignal.ConnectingtheinputsignaltothereceptaclenotlabeledBRIDGED
INPUT willcausenodamage,butwillcausethespeakerterminalpolaritiestoreverse,so
shouldbeavoidedintheinterestofconsistencyinlabeling.
Theamplifier’sspeakerterminalsarereconfiguredinbridgedmode. Theleftchannelpositive
terminalbecomesthebridgednegativeterminalandtherightchannelpositiveterminal
becomesthebridgedpositiveterminal.
Seethenextpageforadiagramofastereoamplifierconfigurationusingtwobridgedmode
S20amplifiers.Speakerterminalsinthediagramaremarkedwiththeirbridgedmode
polarities.
TechnicalNote:InbridgedmodetheXLRinputreceptaclesareinternallyconnectedtoeach
otheraccordingtothediagrambelow.
7
DETAILEDINSTALLATION
IV.BRIDGEDSETUP DIAGRAM
8
DESIGNPHILOSOPHY
I.DesignPhilosophyand Approach
Thesubtletyofthedesignprocessatthislevelofperformancemakesitimpossibletoeasily
explainalloftheadvantagesinherentintheS20.However,wepresenthereanoverviewto
giveyouanunderstandingofsomeofitsuniquefeaturesandanideaofthelistening
experienceyoucanexpect.Oftenaparticulartechniquehasnumerousunrelatedadvantages
andpossibilities.Wemakeeveryefforttoexploittheseadvantageswiththefinalresultbeing
anamplifierthatisgreaterthanthesumofitsindividualfeatures
ThetopologyandcomponentselectionisbuiltonthefoundationestablishedbytheSystem
100.Balancedinterconnectionsareprovidedtotakeadvantageoftheirgreaternoise
rejectionasintheSystem100.Differentialvoltagegainthroughoutprovidesexceptional
rejectionofexternalnoiseandcontributestotheinherentDCstabilityofthecircuit. This
allowsdirectcouplingwithoutservocircuitry. Theunitalsousesoutputfollowersoperating
withoutfeedback.
ThefrontendoftheS20isdesignedtooperatewithouteverenteringClassBoperationasis
commoninmanyotherdesigns. Thiscombinedwithexcellenthighfrequencydesigninsures
linearoperationathighspeed,andtranslatesintoasonicreproductionwhichisextremely
transparentincharacter. Thesupplytakesaverydirectapproachtohighperformance.First,
atopqualitytoroidtransformerandover80000ufofcapacitancewithverylowESRand
inductanceisused.Foroptimumperformanceandreliabilityallcircuitryremainscontinuously
powered.
ThespecificationsareconsistentwithwhatwouldbeexpectedinahighcurrentClass A
amplifierdesign.Inthisdesign,however,anunusualdegreeofattentionhasbeenpaidto
sonicallymeaningfulparameters.
Forexample,thecurrentstageiscapableofproducingpeakcurrentsinexcessof100
Ampereswithadegreeoflinearityandspeedwhichisnotmatchedbyotherdesignswhen
producingonlyafractionofofthiscurrent. Thisisachievedbytheimplementationofseveral
distinctcircuitfeatures.
TheS20usesbiasvoltagesandcomponentvalueswhichhavebeenspecificallyselectedto
produceaprecisiontransitionwithnoabruptchangesindistortionoroutputimpedance. This
“PrecisionBias”techniqueyieldsseamlessperformanceregardlessofthecomplexityofthe
loadimpedanceandisparticularlyeffectiveateliminatingaformofIMdistortionwhichoften
occursintheseinstances.
I.DesignPhilosophyand Approach(continued)
Tomaintain “PrecisionBias”requiresanadvancedbiascircuitthatmusthaveaveryhigh
degreeofstabilityunderawiderangeoftemperaturesandloadconditions. Theusualbias
networkisofsuchhighimpedanceandpoorthermalregulationthatattheextremesof
operation,biascurrentsareineffectivelycontrolled. Advancedtrackingtechniquesresultsin
absolutecontrolofbiascurrentsunderallconditionsintheS20.
Themainpowersupplyoftheamplifierconsistsofa1500VA toroidalpowertransformerwith
independentrectifierstoisolatethechannelsfromoneanother.Eightythousandmicrofarads
oftotalcapacitanceprovideeffectivefiltering.
Theaboveattributesresultinaamplifierofsuchextremelinearityandbandwidththatno
overallfeedbackcorrectionisrequiredorused.Oneadvantageofthisisahighdegreeof
immunityfrominteractionswithloadsorcablesandasuperiortransientresponse. An
extremelylownon-reactiveoutputimpedanceismaintainedwellbeyond20,000Hz. The
resultinguniformdampingfactorisnotusuallyfoundinotherdesigns.
TheS20hasallstructuralpartsmadeofmachinedaluminumwhicharemilledtoveryclose
tolerancesyieldingtheseamlessappearancecharacteristicofpreviousproductsfromCoda.
Aswithallamplifiers,heatdissipationisimportant. TheS20usesfourmassiveheatsinksfor
efficient,noiseless,andcleanthermalrelief. Thethermalcoefficientoftheheatsinksisoneof
thelowestandmosteffectiveintheaudioindustry.
9
DESIGNPHILOSOPHY
10
DESIGNPHILOSOPY
II.MaterialQuality
Theamplifier’schassisismadefromheavy-gaugesteelwithahalf-inchmachinedaluminum
faceplate. Allexteriormetalpartsareanodizedorpowdercoatedfordurability.
Printedcircuitboardsarefiberglassepoxywithgoldplatingoveratin/nickelbarrier. Thegold
layerwillnotcorrode,whilethebarrierlayerpreventsthegoldfrommigratingtothelower
copperlayer.
Allresistorsareprecisionmetalfilm;1%tolerancefor1/4-wattand5%tolerancefor1-watt.
Capacitorshavebeeneliminatedwhereverpossible.Noelectrolyticcapacitorsareused
exceptinthepowersupply,whereseveralhigh-capacitanceelectrolyticsprovideoutstanding
filteringofthesupplyoutput.
Allsemiconductordevicesareofveryhighgrade.Voltagegainisaccomplishedwithan
extremelyhigh-quality,matcheddualFET,chosenforit’sexceptionallylownoise
characteristics.
Allaudioinputandoutputconnectorcontactsaregold-plated,andXLRreceptaclesare
manufacturedbyNeutrikofSwitzerland.Wireisusedaslittleaspossibleinthesignalpath-
onlytoconnecttheRCA jacksandspeakerterminalstothecircuitboard-andwhatisusedis
141-strandsilver-platedcopperwithsiliconeinsulation.
11
TECHNICAL DATA
STEREO
BRIDGEDMONO
POWERSUPPLY
DIMENSIONS
RatedPower: 200Watts@8Ohms
FrequencyResponse: -3dB@DCto100kHz
Distortion: <.04%from10Hzto20kHz@50W
Gain: 26dB
MaximumCurrent: 100 Amperespeakperchannel
Noise: Lessthan120dBreferencedtoratedoutput
InputImpedance: 50kOhmsunbalanced/10kOhmsbalanced
OutputImpedance: .04Ohmsfrom20Hzto20kHz
RatedPower: 800Watts@8Ohms
FrequencyResponse: -3dB@DCto100kHz
Distortion: <.04%from10Hzto20kHz@50W
Gain: 26dB
MaximumCurrent: 100 Amperespeakperchannel
Noise: Lessthan120dBreferencedtoratedoutput
InputImpedance: 50kOhmsunbalanced/10kOhmsbalanced
OutputImpedance: .04Ohmsfrom20Hzto20kHz
Transformer Type: Multi-tap,multi-windingtoroidal
TransformerRating: 1500VA
PowerFiltering: 80,000 F
Height: 5.75"
Width: 17.5"
Depth: 12.5”
Weight: 45lbs
Powerrequirement: 450Wattsmaximumatratedpower
μ
12
CARE&HANDLING
Theinterioroftheunitrequiresnospecialcare.Ifitbecomesnecessarytocleantheexterior,
asimpledustingmaybeallthatisrequired.Ifacleanerisnecessary,anydilutecommercial
ammoniabasedproductwillbeappropriate.NEVERuseanyabrasiverags,cleanersor
chemicalsolventsonCodaproducts.
Whenhandlingtheunit,takecarenottomarthealuminum. Aluminumisamediumhardness
metalandcanbescratchedbythehardertoolsteels.
Avoidexposingtheunittodirectsunlight,andkeepitawayfromsourcesofintenseheat.
Donotthrowawaythecartonorassociatedpackingmaterial. Theyareidealifyouneedto
packtheunitformovingandintheunlikelyeventthatservicingisneeded,theywillbe
necessaryforsafeshipment.
Besuretoprovideadequateinsurancewhenshipping.
13
WARRANTY &DISCLAIMER
I.Warranty- Anyfailureofthe AmplifierS20,hereafterknownastheproductororiginal
product,tooperateortomeetspecifications,applicableattimeofmanufacture,duetoa
manufacturingdefectorcomponentfailure,willbecorrectedbyCoda Technologieswithout
chargeforpartsorlabor,foraperiodoftenyearsfromdateoforiginalpurchase.Coda
Technologieswillprovideforsurfacetransportationtoandfromthefactoryforaperiodofone
yearfromdateoforiginalpurchase.
II.Procedure-IftheproductshouldrequireserviceunderwarrantycontactCoda
Technologiesatthelocationonthebackcoverofthismanualforshippinginstructions.
ProductspurchasedoutsideoftheUnitedStateswillbecoveredbythewarrantyconditions
extendedbytheimportingdistributorwhichmaydifferfromthosegivenabove.
III.ExclusionofCoverage-Coda Technologiesisnotobligatedtoservicetheproductin
certainconditions,asaccordingtothefollowingsubsections.
a. Theproducthasbeendamagedthrough:
i.operationnotinaccordancewiththeinstructionsinthismanual
ii.abuse,tampering,modificationoraccident
iii.serialnumberdefacement
B.
c. TheproducthasbeentransportedoutsideoftheUnitedStatesof America.
IntheseconditionsanyservicewillbemadeatCoda Technologiessoleoption.
IV. TotalLossandReplacement-Iftheproductissubmittedforserviceduetoasevere
malfunctionwhichhascauseddamagesufficientenoughtomakearepairattemptinfeasible,
theproductwillbereplacedwithanotherunitofequalorsuperiorspecifications.Coda
Technologiesproductlineisfrequentlyupdatedandchanged,andthespecificmodeland
versionoftheoriginalproductmaybediscontinuedatanytimewithoutnotice.Inthiscaseno
guaranteesaremadethatthereplacementunitwillbevisuallysimilartotheoriginalproduct.
V.SubjectiveDifferences-Noguaranteeismadethattheproductwillperformtoany
specificationsthatcannotbemeasuredandconfirmedwithprecisionaudioanalysis
equipment.Coda Technologiesisonlyobligatedtomakerepairswhichwillbringtheproduct
intocompliancewiththespecificationsstatedinthismanual.
VI.UnnecessaryService-Inallconditions,iftheproductissubmittedforserviceandfound
tobeoperatedwithoutfaultandwithinspecifications,shippingchargeswillbebilledtothe
customer.
Thiswarrantygivesyouspecificlegalrights. Youmayhaveotherrightswhichvaryfromstate
tostate.
Disclaimer-Coda Technologiescannotbeheldresponsibleforanydamagecausedbytheir
products,includingbutnotlimitedto:
a.DamagetospeakerscausedbyfailureofaCoda Technologiesproducttomute
ordisableitselfasexpectedordescribedinitsmanual.
b.DamagecausedbyconnectingaloadtoaCoda Technologiesproducthaving
animproperimpedanceasdescribedintheproductsmanual.
c.Damagecausedbydefectsindesign,constructionorcomponentquality.
Theproducthasbeentransferredtoathirdparty.Inthiscasethewarranty
Iisvalidfor5yearsfromdateofmanufactureasdeterminedfromtheserialnumber.
14
WARRANTY REGISTRATION
FillinthisregistrationsheetandfaxormailittoCoda Technologiestoensureyouareinour
warrantysystem. Thiswillfacilitatewarrantyserviceshoulditbecomenecessary.
Itisrecommendedthatyouretainacopyofthisformforyourownrecords.Coda
Technologies’addressandfaxnumberarelocatedonthebackofthismanual.
MODEL DESIGNATION:
SERIAL NUMBER:
DATEOFPURCHASE:
PLACEOFPURCHASE
OWNERINFORMATION
NOTES:
Name:
Address:
City: State: Zip:
Phone:
Name:
Address:
City: State: Zip:
Phone:
7850CUCAMONGA AVENUE#34
SACRAMENTO,CA 95826USA
phone
onthewebat
emailusat
fax
+01916.383.3653 +01916.455.3653
CODA.CC
[email protected]
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Coda S20 Amplifier User manual

Coda
Brand
Coda
Model
S20 Amplifier
Category
Audio amplifiers
Type
User manual
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