Coda S20 Amplifier User manual

Brand: Coda

Model: S20 Amplifier

Category: Audio amplifiers

Type: User manual

CARE&HANDLING

WARRANTY REGISTRATION

WARRANTY & DISCLAIMER

OPERATION MANUAL

AmplifierS20

INITIAL SETUP

DETAILED INSTALLATION

DESIGN PHILOSOPHY

TECHNICAL DATA

INTRODUCTION

SAFETY PRECAUTIONS

CODA TECHNOLOGIESINC. PRECISIONBIASCLASS AB AMPLIFIER

RCA/YL

XLR/GNLEFT RIGHT

CAUTION

WARNING

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.

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.

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.

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.

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

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.

DETAILEDINSTALLATION

IV.BRIDGEDSETUP DIAGRAM

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.

DESIGNPHILOSOPHY

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.

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

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.

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

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.

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]

Coda S20 Amplifier User manual

Brand: Coda

Model: S20 Amplifier

Category: Audio amplifiers

Type: User manual

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Coda S20 Amplifier User manual

Coda S20 Amplifier User manual

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