DaytonAudio MCA3545 User manual

User Manual
daytonaudio.com
80 Watt Bi-Amplifier
MCA3545
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Thank you for purchasing the MCA3545 Bi-Amplifier. It was designed and built to provide years of high quality sound reproduction
when used in active 2-way loudspeakers for music playback, computer sound systems, and home theater applications. The ampli-
fier includes features like user selectable high pass and low pass filters, independent high and low frequency level controls, rugged
independent LM3886TF output devices, and comprehensive internal protection against shorted speaker loads, thermal faults, and
overload conditions.
• 24dB/octavehighpassandlowpasslters
• Balancedandunbalancedlinelevelinput
• Thermal,overloadandfuseprotectioncircuitry
• AutoOn/Offstand-bycircuit
• Operateson115Vof230V
Features:
• Userselectablehighandlowfrequencycrossoverpoints
• IndependentLM3886TFoutputdevices
• Masterlevelcontrol
• Independenthighandlowlevelcontrols
• Switchable3dBlowfrequencyboost
Front Panel Controls/Connections
1. Power Status LED
ThepowerLEDilluminateswhenthepowerswitchisintheON
position.After20minutesofnosignaltheunitwillgointostand-
bymodeandtheLEDwilldim.
2. Power Switch (Off/Auto On)
TheamplierismanuallyturnedONorOFFviathisswitch.When
instand-bymode,(nosignalpresent)thecurrentdrawandheat
generatedisverylow,thereforeitcanbeleftintheONposition
indenitely.The unit will go into stand-by mode if no signal is
presentfor20minutes.
3. Voltage Selector Switch
Thisswitchallowstheusertoselect115Vor230Voperation.The
unitissetatthefactoryfor115Voperation.Whenoperatingat230V
besuretochangethefusetoaslowblow1A,250Vtypefuse.
4. IEC Power Jack
ThisunitfeaturesagroundedIECtypepowerjack.Thisallows
theusertochangethepowercorddependingonthecountryand
voltageused.TheIEC jackalsohouses thefuseholderwhich
uses5mmx20mm,slowblow250Vtypefuse.Theunitissetat
thefactoryfor115VoperationandissuppliedwithaUSAtype
powercordanda2Aslowblow250Vfuse.
5. Level Control
Thisisthe“master”levelcontrolthatadjuststheoveralloutputlevel
(bothhighandlowlevelsimultaneously)oftheamplier.
6. Woofer Control
Independentlyadjustslowfrequencyoutputlevel,tothewoofer
only.Adjustmentrangeis0~+5dB.
7. Tweeter Control
Independentlyadjustshighfrequencyoutputlevel,tothetweeter
only.Adjustmentrangeis0~+3dB.
NOTE:Independentwooferandtweeteradjustmentsallowprecise
speakercomponentbalancing,compensatingfordifferentlevels
inprogrammaterialandvaryingroomacoustics.
8. RCA Input
RCAconnectionacceptsstandard1Vp-plinelevelsignal.This
is the unbalanced line level input for connection to standard
consumergradeequipmentandaudioequipmentcommonlyused
inhomeapplications
9. XLR Input
This is the balanced line level input for connection to mixing
consolesandotherprofessionaltypeaudioequipmentcommonly
usedinstudioapplications
Output Connections
Speaker Outputs
Therearetwosetsofspeakeroutputslocatedontherear(PC
boardside)ofthe ampliermodule.Eachcolorcoded red(+)
andblack(-).Theblackornegativewirefeaturesa.110"push
onconnectorandtheredorpositivewireusesa.187"pushon
connector.Outputconnectionslistedbelowassumeyouarefacing
therearoftheampliermodule(PCboardside),withthepower
transformerlocatedtotheleft.Loadsoneachoutputleadmust
haveanominalimpedanceof8ohmorhigher.
Tweeter
Thisoutputconnectionislocatedonthefarrightsideofthemain
amplierPCboard.Notetheredandblackleadsareconnected
tocorrespondingtabsonthePCboardlabeledT+andT-.
Woofer
Thisoutputconnectionislocatedtowardsthemiddleleftsideof
themainamplierPCboard,approximately2-1/2"fromtheleft
edgeoftheboard.Notetheredandblackleadsareconnectedto
correspondingtabsonthePCboardlabeledW+andW-.
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Frequency Response Graphs
Thesegraphs showthe frequencyresponse of eachcrossoverpoint for
boththelowfrequency(woofer)andhighfrequency(tweeter).Eachgraph
alsoshowstheeffectofthe“boost”circuitforeachlowfrequencycrossover
point.Note:Asyoucanseefromthegraphsthecrossoverpointsarehigher
whentheboostcircuitisactivated.
Jumper Settings
TheMCA3545hasuserselectablehighandlowfrequencycrossoverpoints
which make the amplier extremely versatile. The unit has 5 crossover
pointsthatfeature24dB/octaveslopeandareselectedusingjumpertype
connectors.Fig1showslocationofcrossoverpointsonthepreampboard
alongwiththepropermethodofconnectingthejumpers.
Note:Thefactorysettingis3.8KHzforboththetweeterandwoofercircuits.
Boththehigh(Tweeter)andlowfrequency(Woofer)crossovercircuitshave
their own jumpers.This makes it possible for the user to select different
crossoverpointsforthe“tweeter”versesthe“woofer”circuits.The“tweeter”
connectionsarealwaysthetwoleftpinsforeachcrossoverpoint.
Note:Onlyonecrossoverpointshouldbeselectedforeachcircuit(tweeter
orwoofer).
Low Frequency Boost
Thelowfrequencycircuitalsofeaturesaswitchableboostsetting.Theboost
circuitaddsroughly3dBofgainthroughoutthelowfrequencyrange.Becauseof
thisthecrossoverpointsforeachsettingarehigherwhentheboostisactivated.
Note:Thefactorysettingfortheboostcircuitis“OFF”.Whenactivatingthe
boostboth“Boost”jumpersmustbeinthe“ON”position.Theboostcircuitonly
effectsthelowfrequencyresponse.
Pre Amp Board
Fig. 1
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MCA-09 ©2009DaytonAudio®
Warranty Information
DaytonAudio®productsareconstructedbyindustryexperts,andarethoroughlytestedbeforeshipment.DaytonAudio®
productsarewarrantedfortheperiodofoneyear.Thiswarrantyislimitedtomanufacturerdefects,eitherinmaterialsor
workmanship.DaytonAudio®isnotresponsibleforanyconsequentialoninconsequentialdamagetoanyotherunitor
componentorthecostforinstallationorextractionofanycomponentoftheaudiosystem.Intherarecaseofaproduct
failure,pleasecontactyourplaceofpurchaseorcallourCustomerSupportDepartmentat(937)743-8248.
Warranty Limitations
Therearenootherwarranties,eitherexpressorimplied,whichextendtheforegoing,andtherearenowarrantiesof
merchantabilityortnessforanyparticularpurpose.Thewarrantywillnotcoverincidentalorconsequentialdamagedueto
defectiveorimproperuseofproducts.Thisincludesbutisnotlimitedtoburntvoicecoils,overheating,bentframes,holesin
thecone,orbrokenleadwires.
Thiswarrantygivesyouspeciclegalrightsandyoumayalsohaveotherrightswhichvaryfromstatetostate.
Non-WarrantyService:Ifnon-warrantyserviceisrequired,theproductmaybesenttotheCompanyforrepair/replacement,
transportationprepaid,bycalling(937)743-8248fordetails,completeinstructions,andservicefeecharges.
Specifications
High Frequency Section
SpeakerImpedance: 8ohm
PowerOutput: 35WRMS@8ohm
Frequencyresponse: 2.2KHz-20KHz
THD: Lessthan0.05%@ratedpower
S/NRatio: Greaterthan83dBatratedpower
Low Frequency Section
SpeakerImpedance: 8ohm
PowerOutput: 45WRMS@8ohm
Frequencyresponse: 15Hz-5.2KHz
THD: Lessthan0.05%@ratedpower
S/NRatio: Greaterthan83dBatratedpower
BassBoost: 3dBfrom20Hz~200Hz
General
CrossoverSlope: 24dB/octavelowpassandhighpasslters
CrossoverPoints 2.2KHz,3.2KHz,3.8KHz,4.5KHz,5.2KHz,
Inputsensitivity: 1000mVp-p
PowerRequirements: 115AC,60Hzor230V,50Hz
PowerStand-By: 0.7Wconsumption
OverallDimensions: 85/8"(H)x53/8"(W)x4-1/2"(D)
RequiredOpening: 73/4"(H)x45/8"(W),3-1/4"(D)
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