McIntosh C712 User manual

C712
SYSTEM
CONTROL
CENTER

C712
SYSTEM
CONTROL
CENTER

IMPORTANT
SAFETY
INSTRUCTIONS
THESE
INSTRUCTIONS
ARETO
PROTECT
YOUANDTHE
MclNTOSH
INSTRUMENT.BE
SURETO
FAMILIARIZE
YOURSELFWITH
THEM.
Copyright©1997by
MclntoshLaboratory,Inc.
1.Readallinstructions- Readthesafetyandoperatinginstructionsbefore
operatingtheinstrument.
2.RetainInstructions- Retainthesafetyandoperatinginstructionsforfuture
reference.
3.Heedwarnings- Adheretowarningsandoperatinginstructions.
4.FollowInstructions- Followalloperatinganduseinstructions.
WARNING:TOREDUCERISKOFFIREORELECTRICALSHOCK,DONOT
EXPOSETHISINSTRUMENTTORAINORMOISTURE.
5.PowerSources- Connectthepowersupplyonlytothetypedescribedinthe
operatinginstructionsorasmarkedontheunit.
6.PowerCordProtection- Routepowersupplycordssothattheyarenotlikelyto
bewalkedonorpinchedbyitemsplaceduponoragainstthem,payingparticular
attentiontocordsatplugs,conveniencereceptacles,andthepointwheretheyexit
fromtheinstrument.
7.Ventilation- Locatetheinstrumentforproperventilation.Forexample,the
instrumentshouldnotbeplacedona bed,sofa,rug,orsimilarsurfacethatmay
blockventilationopenings;or,placedina built-ininstallation,suchasa bookcaseor
cabinet,thatmayimpedetheflowofairthroughtheventilationopenings.
8.Heat- Locatetheinstrumentawayfromheatsourcessuchasradiators,heat
registers,stoves,orotherappliance(includingamplifiers)thatproduceheat.
9.WallorCabinetMounting- Mounttheinstrumentina wallorcabinetonlyas
describedintheowner'smanual.
10.WaterandMoisture- Donotusetheinstrumentnearwater- forexample,neara
bathtub,washbowl,kitchensink,laundrytub,ina wetbasementorneara swimming
pool,etc.
11.Cleaning- Cleantheinstrumentbydustingwitha drycloth.Cleanthepanelwith
aclothmoistenedwitha windowcleaner.
12.ObjectandLiquidEntry- Donotpermitobjectstofallandliquidstospillintothe
instrumentthroughenclosureopenings.
13.NonusePeriods- UnplugthepowercordfromtheACpoweroutletwhenleft
unusedfora longperiodoftime.
14.DamageRequiringService- Servicemustbeperformedbyqualifiedservice
personnelwhen:
A.Thepowersupplycordortheplughasbeendamaged;or
B.Objectshavefallen,orliquidhasbeenspilledintotheinstrument;or
C.Theinstrumenthasbeenexposedtorain;or
D.Theinstrumentdoesnotappeartooperatenormallyorexhibitsa marked
changeinperformanceor
E.Theinstrumenthasbeendropped,ortheenclosuredamaged.
15.Servicing- Donotattempttoservicebeyondthatdescribedintheoperating
instructions.Allotherserviceshouldbereferredtoqualifiedservicepersonnel.
16.GroundingorPolarization- Donotdefeattheinherentdesignfeaturesofthe
polarizedplug.Non-polarizedlinecordadapterswilldefeatthesafetyprovidedby
thepolarizedACplug.
2

17. CAUTION: TO PREVENTELECTRICALSHOCK DONOTUSE THIS
(POLARIZED)PLUGWITHANEXTENSIONCORD,RECEPTACLEOROTHER
OUTLETUNLESSTHEBLADESCANBEFULLYINSERTEDTOPREVENT
BLADEEXPOSURE.
ATTENTION: POURPEVENIR LES CHOCSELECRIQUES PAS UTILISER
CETTEFICHEPOLARISEEAVECUNPROLONGATEUR,UNEPRISEDE
COURANTOUUNEAUTRESORTIEDECOURANT,SAUFSILESLAMES
PEUVENTETREINSEREESA FONDSANSENLAISSERAUCUNEPARTIEA
DECOUVERT.
Thelightningflashwitharrowhead,withinanequilateraltriangle,is
intendedtoalerttheusertothepresenceofuninsulated"dangerous
voltage"withintheproduct'senclosurethatmaybeofsufficient
magnitudetoconstitutea riskofelectricshocktopersons.
CAUTION: TO PREVENT THE RISK OF
ELECTRICSHOCK,DONOTREMOVECOVER(OR
BACK).NOUSER-SERVICEABLEPARTSINSIDE.
REFERSERVICINGTOQUALIFIEDPERSONNEL.
Theexclamationpointwithinanequilateraltriangleisintendedtoalert
theusertothepresenceofimportantoperatingandmaintenance
(servicing)instructionsintheliteratureaccompanyingtheappliance.
WARNING:THISUNITISCAPABLEOFPRODUCINGHIGH
SOUNDPRESSURELEVELS.CONTINUEDEXPOSURETO
HIGHSOUNDPRESSURELEVELSCANCAUSE
PERMANENTHEARINGIMPAIRMENTORLOSS.USER
CAUTIONISADVISEDANDEARPROTECTIONIS
RECOMMENDEDWHENPLAYINGATHIGHVOLUMES.
IMPORTANT
SAFETY
INSTRUCTIONS
THESE
INSTRUCTIONS
ARETO
PROTECT
YOUANDTHE
MclNTOSH
INSTRUMENT.BE
SURETO
FAMILIARIZE
YOURSELFWITH
THEM.
LIGHTNING- Foraddedprotectionforthisproductduringa lightningstorm,orwhen
itisleftunattendedandunusedforlongperiodsoftime,unplugitfromthewalloutlet
anddisconnecttheantennaorcablesystem.Thiswillpreventdamagetothe
productduetolightningorpowerlinesurges.
OVERLOADING- Donotoverloadwalloutlets,extensioncordsorintegral
conveniencereceptaclesasthiscanresultina riskoffireorelectricshock.
REPLACEMENTPARTS- Whenreplacementpartsarerequired,besuretheservice
technicianhasusedreplacementpartsspecifiedbythemanufacturerorhavethe
samecharacteristicsastheoriginalpart.Unauthorizedsubstitutionsmayresultin
fire,electricshock,orotherhazards.
SAFETYCHECK- Uponcompletionofanyserviceorrepairstothisproduct,askthe
servicetechniciantoperformsafetycheckstodeterminethattheproductisinproper
operatingcondition.
RISKOFELECTRICSHOCK
DONOTOPEN
CAUTION
3

THANK
YOU
YourdecisiontoownthispieceofMclntoshStereoEquipmentranksyouatthe
verytopamongdiscriminatingmusiclisteners.Younowhave"TheBest".The
Mclntoshdedicationto"Quality",isassurancethatyouwillreceivethousandsof
yearsofmusicalenjoymentfromthisunit.
Pleasetakea shorttimetoreadtheinformationinthismanual.Wewantyoutobe
asfamiliaraspossiblewithallthefeaturesandfunctionsofyournewpieceof
Mclntosh.Thiswillensurethatyoureceivealltheperformancebenefitsthis
instrumentcanofferyou,andthatitwillbecomea highlyvaluedpartofyourhome
musicsystem.
Theserialnumberandpurchasedateareimportanttoyouforpossibleinsurance
claimorfutureservice.Recordthisinformationhere.
SerialNumberPurchaseDate
INTRODUCTION5
HOWTOINSTALLTHEC7125,6
FRONTPANELCONTROLS,SWITCHESANDPUSHBUTTONS6,7
REARPANELANDHOWTOMAKECONNECTIONS7 -10
C712HANDHELDREMOTECONTROLLER10-12
SPECIFICATIONS12
CUSTOMINSTALLATIONDRAWING13
FOLDOUTDRAWINGSOFFRONTANDBACKPANEL.........14
TABLEOF
CONTENTS
4

Mclntoshhasearnedworldrenownforitstechnicalcontributionstoimprovedsound
reproduction.WhenyouboughtMclntosh,youboughtnotonlyhightechnology,butalso
technologicalintegrityprovenbytime.TheMclntoshC712SystemControlCenterisanother
exampleofMclntoshengineeringexcellence.
Mclntoshaudioproductsarealwaysdesignedforthebestsoundandsuperiorreliability.
Dedicationtoachievingthesegoalssince1949,hasearnedMclntoshthereputationfor
creatingthefinestqualityproductsinthestereoindustry.TheMclntosh"Classic"design
hasalsobeenrecognizedasthemostoutstandingintheindustry.
Mclntoshproductsaredesignedtobemaximumuserfriendlysoanyonecanenjoyusing
them.AnotherMclntoshdesignpolicyistoprovideproductsthatareeasytomaintain.
TheC712SystemControlCenterissimple,yetelegant.Therearemanyusefulfeatures
toenhanceyourlisteningenjoyment.TheC712isfullyremotecontrolledandalloperating
functionscanbeperformed atthefrontpanel,fromtheHandHeldRemoteControllerorfrom
awallmountedKeypad.
Therearesevenpairsofhighlevelinputstoaccommodatethetraditionalprogramsources
aswellasthemostrecentnewsources.TheseincludeCDplayers,audiosignalsfromlaser
discplayersandaudiofromvideorecorders.A PHONOinputisalsoprovidedfora record
playerwitha magneticphonocartridge.IfthePHONOisnotused,theAUXinputcanaccom-
modateanotherhigh-levelprogramsource.
DIGITALLOGICintegratedcircuitsdriveELECTROMAGNETICSWITCHESonallinputsand
operatingfunctionsforthemostreliable,lowestdistortionswitchingavailabletoday.
TwoTAPEMONITORswitchesallowtheuseoftwoseparatetaperecorders.TwoTAPECOPY
switchesarealsoprovidedforeasytapecopyingfromonerecordertotheother.A continuously
variableActiveLoudnesscontrolallowsloudnesscompensationtobeselectedforanyset-
tingofthevolumecontrol.TheLoudnesscontrolcircuitelementsareremovedfromthesignal
pathwhenthecontrolisintheflatorfullycounterclockwiseposition.
BassandTrebletonecontrolsprovide12dBofboostorcut.Atthecenterordetentposition
ofthetonecontrols,alltonecontrolcircuitsareremovedfromthesignalpath.Otherfeatures
includea frontpanelHeadphoneoutput,a MonoswitchandrearpanelSignalProcessorLoop
connectionsthataffectthemainoutputs.Powersupplyvoltageregulatorcircuitsmaintain
stableoperationeventhoughtheACpowerlinemayvary.Adoubleshieldedpowertransformer
completelyisolatesitfromtheaudiocircuits.
ApairofBalancedOutputsisalsoincludedtotakeadvantageofthegreaternoisereduc-
tioncapabilitiesofbalancedcables.
TheC712canbeplaceduprightona tableorshelf,standingonitsownplasticfeet.It
alsocanbeinstalledinanoptionalMclntoshL70equipmentcabinet.Followthemounting
instructionsenclosedwiththeL70cabinet.
TheC712alsocanbecustominstalledina pieceoffurnitureorcabinetofyourchoice.
Therequiredpanelcutoutandunitdimensionsareshownona pagefurtherbackinthismanual.
AlwaysprovideadequateventilationforyourC712,eventhoughitdevelopsverylittleheat.
Cooloperationinsuresthelongestpossibleoperatinglifeforanyelectronicinstrument.Do
notinstallyourC712directlyabovea heatgeneratingcomponentsuchasa highpowered
amplifier.Ina systemstack,thepoweramplifiershouldalwaysbeatthetop.Ifallthecom-
onentsareinstalledina singlecabinet,a quietrunningventilationfancanbea definiteasset
INTRODUCTION
HOWTO
INSTALL
THE C712
5

HOWTO
INSTALL
THE C712
inmaintainingallthesystemcomponentsatthecoolestpossibleoperatingtemperatures.
Acustomcabinetinstallationshouldprovidethefollowingrecommendedminimumspac-
ingdimensionsforcooloperation.Allowatleast1-1/2inches(3.8cm)abovetheunitsoairflow
isnotobstructed.Allow17-1/2inches(44.5cm)depthbehindthemountingpanel,whichin-
cludesclearanceforconnectors.Allow1-1/8inches(2.9cm)infrontofthemountingpanel
forknobclearance.
The last page of this manual folds out to show photographs of the front and rear
panels of the C712. This will help you in identifying and locating the controls and
switches on the C712 front panel, and the connectors on the rear panel. The letters
and numbers on the photographs refer to the paragraphs that follow.
A.INPUT
SelectstheprogramsourcethatfeedstheMAINBALANCED,UNBALANCED,TAPE1 and
TAPE2 OUTPUTS.
B.BASSandTREBLE
Provide12dBBoostorCutwithflatresponseatthecenterdetentposition.Alltonecontrol
circuitelementsareremovedfromthesignalpathinthecenterflatposition.
C.BALANCE
TheBALANCEcontroladjuststhevolumeofthechannelsrelativetoeachother.
L,(left):Turnthecontroltothelefttoaccenttheleftchannelbyreducingthevolumeof
therightchannel.
R,(right):Turntherighttoaccenttherightchannelbyreducingthevolumeintheleftchannel.
D.LOUDNESS
TheLOUDNESScontrolprovidesfrequencyresponsecontouredtocompensateforthe
behaviorofthehumanearatsofterlisteninglevels.Atthefullycounterclockwisedetentposi-
tion,thefrequencyresponseisperfectlyflatandtheloudnesscircuitcomponentsareremoved
fromthesignalpath.Turnthecontrolclockwisetoincreasefrequencycompensationinthe
correctproportionforproperlisteningatsoftervolumelevels.Thecompensatedfrequency
responseisnotaffectedbychangesinthevolumecontrolsettings.Firstadjustthevolume
forthedesiredlisteninglevel,thenadjusttheloudnesscontroltothesettingyouprefer.
E.IRSENSORWINDOW
TheIR(Infrared)sensorthatacceptsIRsignalsfromtheC712HandHeldRemoteController.
RVOLUME
AdjuststheVolumelevelfromtheMAINBALANCEDandUNBALANCEDOUTPUTS.The
TAPEOUTPUTSarenotaffectedbytheVOLUMEcontrol.
G.MONO
PresstheMONOpushbuttontoaddtheleftandrightchannelsignalstogetherforMONO
signalsattheMAINBALANCEDandUNBALANCEDOUTPUTS.ARedLEDabovethepushbut-
tonwilllighttoindicatetheMONOmodeofoperation.TheMONOpushbuttondoesnotaffect
theTAPEoutputs.Theyarealwaysstereo.
H.TAPEMONitor1 and2
PressTAPEMON1 or2 tolistentoplaybackoftapesfromeitheroftwotaperecorders.
FRONTPANEL
CONTROLS,
SWITCHES
AND
PUSHBUTTONS
6

Youcanlistentopreviouslyrecordedtapes,ormonitortapefroma three-headtaperecorder
duringtherecordingprocess.TheTAPEMONpushbuttonsoperateindependentlyfromthe
INPUTswitch.A RedLEDwilllightaboveeitherpushbuttontoindicatewhichTAPEMONhas
beenselected.
I.HEADPHONES
Plugina pairoflowimpedancedynamicheadphonestothisjackforheadphonelistening.
PressMUTEontheC712RemoteControllertomutethemainoutputstothepoweramplifier
toallowprivateheadphonelistening.MUTEdoesnotaffecttheHeadphonesOutput.
J.TAPECOPY,1 2,21
Copytapesfromeitheroftwotaperecorders,toeachother.TheTAPECOPYpushbutton
switchesoperateindependentlyfromtheINPUTswitch.UsetheTAPEMONitorswitchesto
monitortheoutputoftherecorderplayingtheoriginaltape,ortherecordermakingthecopy.
ARedLEDwilllightaboveeitherpushbuttontoindicatewhichTAPECOPYmodeisinuse.
TheTAPECOPYswitchesareelectronicallyinterconnectedtopreventbothcircuitsfrom
beingactivatedatthesametime.IfyoupressoneoftheTAPECOPYswitchestoactivate
acopyfunction,youmustpressthesameTAPECOPYswitchagainbeforepressingtheother
TAPECOPYswitch.
K.POWER
PresstheredPOWERbuttontoturntheC712systemON.PressagaintoturnitOFF.The
rearpanelSWITCHEDACOutletturnsonwiththePOWERswitch.
FRONTPANEL
CONTROLS,
SWITCHES
AND
PUSHBUTTONS
Usegoodqualityshieldedcablestointerconnecttheassociatedequipmentusedwiththe
C712.Theinstallationofhighqualitycableswillinsurethebestpossibleperformancefrom
yourstereosystem.YourMclntoshdealercanadviseyouonthetypeandlengthofcables
bestsuitedforyourinstallation.
1.SWITCHEDACOUTLET
TheSWITCHEDACoutletturnsonandoffwiththefrontpanelPOWERSwitch.Connect
apoweramplifieroraccessoriestothisoutlet.
ThetotalpowercapacityoftheSWITCHEDACoutletmustnotexceed1400watts
or11.6amperes.
ToexpandtheACcapacityoftheSWITCHEDoutlet,adda MclntoshR612AorPC2Power
Controller.
2.L andR BALANCEDOUTPUTS
ConnectcableswithXLRtypeBalancedConnectorsfromtheC712,L (Left)andR (Right)
BALANCEDOUTPUTjackstothebalancedinputjacksofa stereoamplifier,ortwomonoamp-
lifiers.SignalsattheBALANCEDjacksarethesamesignalsasattheUnbalancedMAINOUTPUTS.
Usingbalancedconnectorsandcablescanreducenoiseandinterferencebyasmuchas
40dB.Thisextranoisereductioncanbea significantimprovement,especiallyifthecables
arequitelong.Iftwoseparatemonopoweramplifiersareusedwith theC712,balancedcables
caneliminatethepossibilityofhumpickup.IfcablelengthsbetweentheC712andthepower
amplifiersareonemeterorless,youmayfindhighqualityunbalancedcablestobeadequate.
BalancedJackPinConfiguration:
Pin1.SystemGround
Pin2.+ Output
Pin3.- Output
THEREARPANEL
ANDHOW
TOMAKE
CONNECTIONS
7

THEREARPANEL
ANDHOW
TOMAKE
CONNECTIONS
3.MAINOUTPUTS(Unbalanced)
ConnectshieldedcablesfromtheC712MAINL andR OUTPUTStotheLeftandRight
channelpoweramplifierinputs.
4.TAPEOUTPUTS1 and2
Theseoutputsprovidesignalstofeedtwoseparatetaperecorders.Theprogramthatap-
pearsatthetapeoutputsisdeterminedbythesettingofthefrontpanelINPUTswitch.The
TAPECOPYSwitchalsoaffectsthesignalsatthetapeoutputs.
Connecta cablefromtheC712LeftchannelTAPE1 OUTPUTtotheleftchannelhighlevel
inputofa taperecorder.Connecta cablefromtheC712RightchannelTAPE1 OUTPUTto
therightchannelhighlevelinputofthetaperecorder.Connecta secondtaperecorderin
asimilarmanner,totheTAPE2 OUTPUTS.
If more than one tape recorder is connected for both record and play, make certain
that the inputs and outputs of each recorder are connected to the same matching
numbered inputs and outputs.
5.PROCESSORFROMandTO
AnexternalsignalprocessorcanbeaddedtotheC712thatwillaffectonlytheMAINand
BALANCEDOutputs.
ThePROCESSOR-FROMjackshavebuilt-inswitchingcontactstoallownormalsignalsto
passthroughwhennocablesareconnected.Whenanexternalprocessorisproperlycon-
nected,theprogramsignalsfeedtotheprocessorfromthePROCESSOR-TOjacks,andreturn
totheC712atthePROCESSOR-FROMjacks.
Connecta cablefromtheleftchannelprocessoroutputtotheC712leftchannel
PROCESSOR-FROMjack.Connecta cablefromtherightchannelsignaloutputtotheC712
rightchannelPROCESSOR-FROMjack.
Connecta cablefromtheC712leftchannelPROCESSOR-TOjacktothesignalprocessor
leftchannelinput.Connecta cablefromtheC712rightchannelPROCESSOR-TOjacktothe
rightchannelsignalprocessorinput.
WHEN AN EXTERNAL SIGNAL PROCESSOR IS CONNECTED TO THE C712 PRO-
CESSOR JACKS, THE PROCESSOR MUST BE TURNED ON AND OPERATING, OR IN
BYPASS MODE, FOR A PROGRAM TO BE HEARD THROUGH THE SYSTEM.
6.TAPES1 and2
Connecta cablefromtheleftchanneloutputofa taperecordertotheC712L(Left)channel
TAPE1 or2 INPUT.Connecta cablefromtherightchanneloutputtothecorrespondingR
(Right)TAPE1 or2 INPUT.Connecta secondtaperecorderina similarmanner.
TheTAPEINPUTScanalsobeusedforotheraccessoryequipmentwithsimilaroutputlevels.
IF MORE THAN ONE TAPE RECORDER IS CONNECTED TO BOTH RECORD AND PLAY,
MAKE CERTAIN THAT THE INPUTS AND OUTPUTS OF EACH RECORDER ARE CON-
NECTED TO THE SAME MATCHING NUMBERED INPUTS AND OUTPUTS.
7.VIDEO
Usetheseinputsfortheaudiosignalsfromaccessoriessuchasa LaserDiscPlayer,VCR,
orTVreceiver.
Connecta cablefromtheleftchannelaudiooutputofthevideounittotheC712L (Left)
channelVIDEOINPUT.Connecta cablefromtherightchannelaudiooutputtotheC712R
(Right)VIDEOINPUT.UsetheVIDEOinputwhenanoptionalMVS-3Audio/VideoSwitcher
8