McIntosh MAC 4200 User manual

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FOLLOWINGINFORMATIONTOYOUR
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Purchasedate
ServiceContractNumber
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Contracttotheoriginalpurchaser.YourMclntoshAuthoriz-
edServiceAgencycanexpediterepairswhenyouprovide
theServiceContractwiththeinstrumentforrepair.
Copyright1986© byMclntoshLaboratoryInc.

Contents
INTRODUCTION
INSTALLATION
HOWTOCONNECT
FRONTPANELCONTROLS
PERFORMANCELIMITS
PERFORMANCECHARTS
TECHNICALDESCRIPTION
BLOCKDIAGRAM
SPECTRALFIDELITY
3
4
5,6,7,8
9,10,11,
12,13,14,15
16,17
18,19,20
21,22
23
24
YourMAC4200Receiverwillgiveyou
manyyearsofsatisfactoryperformance.
Ifyouhaveanyquestions,pleasecontact:
CUSTOMERSERVICE
MclntoshLaboratoryInc.
2ChambersStreet
Binghamton,NewYork13903-9990
Phone:[phone]
TakeAdvantageof3 years
ofContractService...
FillintheApplicationNOW.
McINTOSHTHREEYEARSERVICECONTRACT
AnapplicationforA THREEYEARSERVICECONTRACTisincludedwiththismanual.
Thetermsofthecontractare:
1. Yourapplication forthe SERVICE CONTRACTmust be6. Alwayshaveservice done bya Mclntosh authorized
completelyfilledinandmustbepostmarkedwithin30
daysofthedateofpurchaseoftheinstrument.
2.ToreceivetheSERVICECONTRACT,allinformationon
theapplicationmustbefilledin.TheSERVICECON-
TRACTwillbeissuedwhentheapplicationiscom-
pletelyfilledinandreceivedbyMclntoshLaboratory
IncorporatedinBinghamton,NewYork.
3.ToreceivetheSERVICECONTRACT,yourpurchase
mustbemadefroma Mclntoshfranchiseddealer.
4.TheSERVICECONTRACTisissuedtoyouasthe
originalpurchaser.Toprotectyoufrommisrepresenta-
tion,thiscontractcannotbetransferredtoa second
owner.
5.AnyMclntoshauthorizedserviceagencywillrepair
Mclntoshinstrumentsatnormalservicerates.To
receiveserviceunderthetermsoftheSERVICECON-
TRACT,theSERVICECONTRACTCERTIFICATEmustbe
presentedwhentheinstrumentistakentotheservice
agency.
serviceagency.Iftheinstrumentismodifiedordamag-
edasa resultofunauthorizedrepair,theSERVICE
CONTRACTwillbecancelled.Damagebyimproper
useormishandlingisnotcoveredbytheSERVICE
CONTRACT.
7.Mclntoshwillprovideallparts,materialsandlabor
neededtoreturnthemeasuredperformanceofthein-
strumenttotheoriginalperformancelimits.TheSER-
VICECONTRACTdoesnotcoveranyshippingcoststo
andfromtheauthorizedserviceagencyorthefactory.
8.UnitsinoperationoutsidetheUnitedStatesand
CanadaarenotcoveredbytheMclntoshServiceCon-
tract,irrespectiveoftheplaceofpurchase.Norare
unitsacquiredoutsidetheU.S.A.andCanada,thepur-
chasersofwhichshouldconsultwiththeirdealerto
ascertainwhat,ifany,servicecontractorwarrantymay
beavailablelocally.
2

TheMclntoshMAC4200isa highquality,FM/AMStereo
Receiverwhosedesignhasbeengovernedbyinsistence
onhighperformancewithlonglife,greatflexibilityand
sensitivity.Theratedpoweroutputisa 75wattsperchan-
nelinto8 ohmsor100wattsperchannelinto4 ohms.
Youwillderivethegreatestenjoymentandmost
satisfactionwhenyouunderstanditsoperationsandits
functions.Yourtimeinvestednowwillreturnaddedvalue
toyoubecausethenyouwillgetthebestresultsfrom
yourMAC4200.
TheadvancedFM/AMtunerdesignoftheMAC4200
displaysthestationfrequenciesdigitally.Thedisplayof
frequenciesintheMAC4200servesa doublefunction.It
showstheinputselectedaswellasthefrequencyto
whichthetunerisadjusted.Stationsareselectedeaslily
eitherbyuseofthemanualtuningknob,orthescanup
ordownfeatureoneitherbandorbyuseofthepreset
feathertouch-buttonsineitherFMorAM.
Thelownoiseelectronicinputswitchingsystemusesin-
putleadsthatareveryshort,onetwentiethofthelength
ofothersystems.Thisprovidesforreducedhumand
noise,bettersourcetosourceisolation(lowercrosstalk),
lowerdistortionandfreedomfromhighpowerTVand
radarsignalinterference.
Theprecisiontrackingvolumecontrolallowscompletely
noisefreeperformanceandaccuracyofthechannelto
channelbalanceoverthefullrange.Itisa stepattenuator
whosechannelaccuracyiswithin1 dBthroughoutitsen-
tirerotation.Suchextremelyaccuratematchingisachiev-
edthroughelectronicallycontrolledtrimmingofthe
resistancematerialdepositedonpairsofprintedcircuits.
Usedoesnotaffectperformanceasinordinaryvolume
controls.
Theloudnesscontroliscontinuouslyvariable.It
operatesindependentlyofthevolumecontrol,andits
contourisaccuratelymodeledafterthefamilyof"Equal
Loudness"curvesdevelopedbyDrs.FletcherandMunson.
Loudnesscontrolsinordinaryequipmentareusuallysim-
ple,passivecircuitsconnectedtoa portionoftherotation
rangeofthevolumecontrol.Asa consequence,loudness
compensationaccuracyisdependentonmanyvariables
suchasspeakerefficiency,amplifiergainanddifferences
ininputlevel.
Afiveband programequalizerpermitsthevolumead-
justmentoffiveimportantfrequencyranges.Musical
balancecanbeadjustedtocompensateforlistener
preferencesorrecordinginaccuracies.Atthedetentinthe
centeroftherotationofeachcontroltheequalizercir-
cuitsaredisconnected,completelyremovedfromthe
operatingcircuits.
Frontpaneltaperecorderjacksmakeplaybackfrom,or
copyingto,a portablerecorderveryconvenient.Thead-
ditionaltaperecordermaybeconnectedtothe
MAC4200withoutdisconnectingyourregularsystem.
TheMAC4200switchingcircuitsallowtheACpowerto
theentirestereosystemtobecontrolledfromeitherthe
turntable'spowerswitchorthepowerswitchonthisex-
ceptionalreceiver.Connectedtoa specialpoweroutletis
acurrentsensingrelaythatwillbeenergizedwhenthe
turntableisturnedonorwhentheredpowerswitchis
pushedon.Therelay,inturn,controlstheACpowerto
therestofthestereosystem.
POWERGUARDdynamicallypermitsthepoweramp-
lifiercircuitintheMAC4200todeliverfullmaximum
powerwithoutthemusicdestroyingsoundsofhardclip-
ping;themusicyouhearisprotectedfromdistortionand
yourspeakersareprotectedfromdamage.
Electronicallyregulatedpowersuppliesmaintainstable
operationevenduringperiodsofloworchangingAC
powerlinevoltage.
INTRODUCTION3

TheMAC4200maybeusedona shelfortabletopin
theenclosureinwhichitcomesormaybeinstalledina
customcabinet.Inanymethodofuseprovideadequate
ventilation.
Thetrouble-freelifeofanyelectronicinstrumentis
greatlyextendedbyprovidingsufficientventilationtopre-
ventthebuild-upofheatthatcausesdeteriorationof
componentparts.Allowenoughclearancesocoolaircan
enteratthebottomofthereceiverandbeventedfrom
thetopandrear.Thefeetinstalledonthebottomofthe
receivermustbeleftinplacewhenusinga shelfortable
topinstallation.Thefeetraisethereceiverabovethe
mountingsurfacetoallowreasonableventilation.If
temperaturesincreaseduetorestrictedventilationor
speakermismatch,anautomatictemperaturesensing
deviceturnsofftheMAC4200.Thedeviceoperates
automaticallyata presettemperature.TheMAC4200will
turnonagainwhenthetemperaturehasreturnedtonor-
mallimits.Thisadditionalfeatureassurescomplete
reliabilityunderthemostextremeoperatingconditions.
INSTALLINGTHEMAC4200
INA CUSTOMCABINET
TheMAC4200isinstalledfromthefrontofa custom
cabinet.Thespaceneededbehindthecabinetpanelis
15"(38.1cm)deep,18-1/2"(47cm)wide,and6"(15.2cm)
highby17-9/16"(44.6cm)wide.Thecabinetpanelmust
becutout5-1/16"(12.9cm)high.Makethiscutoutcareful-
ly.Thereceiver'sfrontpanelhasa 1/8"(.32cm)overhang
onbothsidesanda 3/32"(.24crn)overhangonthetop
andbottom,(seeFig.1)
Theweightofthereceivermustrestona shelfinthe
customcabinetwitha 15"(38.1cm)x 8"(20.32cm)ven-
tilationholecutout.(seeFig.2)Inaddition,a single3/8"
to1/2"(1cmto1.3cm)diameterhole(seeFig.2 andFig.
3)mustbedrilledintheshelf.A screwinsertedthrough
thisholesecuresthereceiverafterinstallation.Thetopof
theshelfmustbeflushwiththebottomofthecustom
panelcutout.
Fig.1 CustomCabinetFrontPanelCutout
PreparetheMAC4200forcustommountingbyremov-
ingthewoodsidesandfeet:
1.Remove4 screws;twofromeachsidepaneland
removethepanels.
2.Onthebottomofthereceiverarethe4 plasticfeet
heldonbyscrews.Removethesefeet.Donotattempt
toremovethe4 plasticbuttonglidesastheserest
againsttheshelf,(seeFig.2 and3)Atthispointthe
receiverisreadytobeinstalled.
Fromthefrontofthecabinet,threadthepowercord
throughtheopeninginthecabinetpanelandslidethe
MAC4200ontotheshelf.Adjustthepositiontoevenly
coveredgesofthepanelcutout.Locktheunitinplace
witha screwandwasherinsertedthroughthedrilledhole
inthemountingshelf(seeFig.3).Usea 1-1/4"(3.2crn)
screwfor1/2"(1.3cm)shelfora 1-1/2"(3.8cm)screwfor
3/4"(1.9cm)shelf.Donotuselongerscrewssincethey
willcontactelectricalcircuitswhichcanleadtoequip-
mentfailureandpossibleinjury.
Fig.1 CustomCabinetFrontPanelCutout
Fig.2 CustomCabinetShelfMountingCutout
Fig.3 MAC4200CustomMountingProfile
4INSTALLATION

Useshieldedcablestoconnectthesignalfromthe
preamplifierorsignalsourcetothepoweramplifier.To
minimizethepossibilityofhumtheshieldedcables
shouldbeofparallelconstructionorlooselytwisted
together,locatedawayfromthespeakerconnecting
cablesandACpowercords.Becertaintousegoodquali-
tyshieldedcablesforallinterconnections.Yourdealer
canadviseyouonthekindandlengthofcablethatwill
bestsuityourinstallation.
Theappropriatelengthandsizeoftheloudspeaker
cableforyourinstallationwillhelptopreservethehigh
qualityofsoundforwhichtheloudspeakershavebeen
designed.Ifundersizewireisused,resistanceisaddedto
theamplifier/loudspeakerscombinationwhichadversely
affectstheperformance.Addedresistancereducesthe
dampingfactor,modifiesthefrequencyresponseand
reducesthepoweroutput.Yourdealer'sadvicewillserve
youbestforyourinstallation.Thecablestoandfromthe
speakershouldbeofparallelconstructionorbeloosely
twistedtogether.Thechartshowstherecommended
minimumwiresizeforthelengthofwirebetweenthe
amplifierandtheloudspeakers.
SPEAKERCABLELENGTHS
AMPLIFIERTOSPEAKER
For4 OhmLoadFor8 OhmLoadWire
Feet
15
25
40
60
100
Meters
4.6
7.6
12.2
18.3
30.48
Feet
30
50
HO
120
200
Meters
9.1
15.2
24.4
36.6
60.0
Gauge
18
16
14
12
10
Thesespeakercablelengthsrepresenta wireresistance
equalto5%ofa speakerimpedance,or97.5%transferof
power.
HOWTOCONNECTLOUDSPEAKERS
Rearpanelpushconnectorsareprovidedforthreepairs
ofstereospeakers.Thecorrespondingfrontpanel
pushbuttonsturnthespeakerpairsonoroff.
Connecttheleadsfromtheleftmain(1)loudspeakerto
the SPEAKERS L 1 and Common pushconnectors.
Connecttheleadsfromtherightmainloudspeakerto
the SPEAKERS R 1 and Common pushconnectors.Con-
nect a second and third pair of speakers tothe SPEAKERS
2and3 pushconnectorsina similarmanner.Tomaintain
frequencyresponse,poweroutputanddamping
characteristics,eachspeakerrequiresa separatecablebe-
tweenthereceiverandtheloudspeaker.
HOWTOCONNECTA TURNTABLE
ConnecttheleftchannelcableoftheturntabletotheL
PH1INPUTjack.Connecttherightchannelcableofthe
turntabletotheR PH1INPUTjack.Connecta second
turntabletothePH2inputjacksinthesameway.Con-
necttheturntable'sgroundwiretotheGNDterminal.
Automaticallyshortingphonojackseliminatethepoten-
tialforhumandcrosstalkandtheneedforshortingplugs.
CONNECTINGPROGRAM
SOURCEGROUNDS
Aground(GND)postisprovidedtoconnectthe
groundsfromrecordchangers,tapedecks,etc.Topre-
venthumpick-up,theleftandrightprogramcablesand
thegroundwirefromthatsourceshouldbewoundor
looselytwistedtogether.Makesurethegroundwiredoes
notmakeanycontacttotheshieldsoftheleftandright
programcablesastheyrunbetweenthesourceandthe
inputofthepreamplifier.
HOWTOCONNECTA CDPLAYER
Connecta cablefromtheleftchanneloutputofa com-
pactdiscplayertotheL CDinputjack.Connecta cable
fromtherightchanneloutputtotheR CDinputjack.
WhentheMAC4200inputselectorswitchisturnedto
CD/AU2(compactdiscplayerorauxilliarysource)thesta-
tiondisplayareawillshowAU2.
HOWTOCONNECTTVAUDIO
Audiofroma TVmonitororanyotherhighlevelsource
isconnectedtotheAUXINPUTS.Connecta cablefrom
theleftchannelaudiooutputofa TVmonitororother
highlevelsource,totheL AUXINPUTjack.Connecta
cablefromtherightchannelaudiooutputtotheR AUX
INPUTjack.
WhentheMAC4200inputselectorswitchisturnedto
theTVAU1 position(televisionsetorauxilliarysource),
thestationdigitaldisplayareawillshowAU1.
HOWTOCONNECTTAPERECORDERS
TORECORD:
Connecta cablefromtheMAC4200L TAPE1 OUTjack
tothelefthighlevelinputofa taperecorder.Connecta
cablefromtheR TAPE1 OUTjacktotherighthighlevel
inputofa taperecorder.Connecta secondtaperecorder
inthesamemannertotheTAPE2 OUTjacks.
TOPLAYBACKORMONITORTAPE:
Connecta cablefromtheleftchanneloutputofa tape
recordertotheMAC4200L TAPE1 INjack.Connecta
cablefromtherightchanneloutputofa taperecorderto
theR TAPE1 INjack.Connecta secondtaperecorderin
thesamemannertotheTAPE2 INjacks.
FRONTPANELTAPE2 RECORDERJACKS
TAPE2 inputandoutputconnectionsarealsoavailable
attheTAPE2 IN-OUTjacksonthefrontpanel.Metal
shielded1/4"stereophoneplugsareused.Theconnec-
HOWTOCONNECT5

tionsaretip:leftsignal;ring:rightsignal;sleeve:common
ground.
Whena plugisinsertedinthefrontpanelTAPE2
INjack,thecircuitstotherearpanelTAPE2 INPUTSare
disconnected.Insertinga pluginthefrontpanelTAPE2
OUTjackdoesnotdisconnecttherearpanelTAPE2
OUT.ItispossibletorecordfromthefrontpanelTAPE2
OUTjackandtherearpanelTAPE2 OUTjackatthe
sametime.However,itisnotpossibletolisten(or
monitor)fromboththefrontandrearTAPE2 INjacksat
thesametime.
THEELECTRONICMEMORYBATTERYPOWERSUPPLY
Averylonglife,rechargeablebatterypowersupplypro-
videstheenergyfortheelectronicmemorywhenthe
receiveristurnedoff.Whenfirstconnected,itiswiseto
assumethatthebatterieshavenotbeencharged.The
chargerateisdictatedbythe'on'timeofthereceiver.To
bringthebatteriestofullcharge,leavethereceiverturn-
edonfortwenty-fourcontinuoushours.Programmedin-
structionswillberetainedformorethansixmonthswith
thereceiverturnedoffifthebatteriesarefullycharged.
Afterthebatteriesarefullycharged,useforapproximate-
lyonehourperweek,willmaintainthebatteriesina fully
chargedstate.
HOWTOCONNECTACPOWER
ApolarizedACplugisusedontheMAC4200.Plugit
intoa 120volt60Hzwalloutlet.Theplugbladesmust
befullyinsertedintheoutlettopreventshockfromex-
posedblades.
CAUTION:TOPREVENTELECTRICSHOCKDONOTUSE
THE (POLARIZED)PLUGONTHISUNITWITHANEXTEN-
SIONCORD,RECEPTACLEOROTHEROUTLETUNLESS
THEBLADESCANBEFULLYINSERTEDTOPREVENTBLADE
EXPOSURE.
ThreetypesofACpoweroutletsareprovidedonthe
backpaneloftheMAC4200:2 black,2 greenandone
red.
Theblackoutletsareswitchedonoroffwhenthe
MAC4200isturnedonoroff.TheseareintendedforCD
players,equalizersorotheraccessories,whosetotal
powerrequirementis600watts.
Theredoutletisonatalltimes.Forexample,a VCR
(videocassetterecorder)canbepluggedintothisoutlet
forrecordinga TVprogramwhenthereceiverisnotturn-
edon.Neithertheredoutletnortheblackoutletsare
fused.
ACpowertothegreenoutletsarecontrolledbythe
AUTOMATICSYSTEMACON/OFF.
AUTOMATICSYSTEMACTURNON/OFF
ThePOWERONpushbuttonsharesACpowercontrol,
withtheACpowerswitchona turntable,througha cur-
rentdetectingswitchcircuit.Ontherearpanel,theTURN-
TABLEAUTO/MANUALswitchselectsthemodeofoperation.
WhentheswitchisintheAUTOpositionanda turn-
tablepluggedintooneofthegreenACpoweroutlets,
theACpowertothereceiverandtotheblackACpower
outletscanbecontrolledbytheturntableon/offswitch.
WhenACpowertotheturntableisturnedon,powerto
thereceiverandtheblackACpoweroutletsisturnedon.
Whenintheautomaticmode,thesystemwillremainon
untiltheturntableisturnedoff.ThePOWERONpushbut-
toncontrolstheACpowerwhenusinganysourceother
thantheturntable.
IntheMANUALpositiononlytheredPOWERON
pushbuttonwillturnACpoweronoroff.Powerfromthe
greenACpoweroutletscannotexceed100watts.
Someturntableshaveelectroniccircuitsthatdrawcur-
rentallthetime.Tousetheseturntablesthe
AUTO/MANUALswitchmustbeintheMANUALposition.
CONNECTINGANFMANTENNA
Provisionshavebeenmadefortheuseofoneofthree
antennasystems:(1)anoutdoorFMantenna,or(2)a VHF-
TVantenna,or(3)theindoordipolesupplied.
Anoutdoorantennaisrecommendedforoptimumper-
formanceinallareas.Infringe(outlaying)areas,best
resultswillbeobtainedwitha highlydirectionalFM
antennausedinconjunctionwitha rotator.Iftheantenna
usesa 300ohmlead,connectittotheANTENNA300ohm
FMpushconnectors.
Iftheantennausesa 75ohmcoaxialcable,connectitto
therearpanelANTENNA75ohmtypeFconnector.
Anoutsideantennasystemshouldnotbelocatedinthe
vicinityofoverheadpowerlinesorotherelectriclightor
powercircuits,orwhereitcanfallintosuchpowerlines
orcircuits.Wheninstallinganoutsideantennasystem,ex-
tremecareshouldbetakentokeepfromtouchingsuch
powerlinesorcircuitsascontactwiththemmightbe
fatal.
AVHF-TVantennacanbeeffectivewhenitisdesigned
forbothFMandTVreception.Connectthetwoleads
fromtheVHF-TVantennatotheANTENNA300FMpush
connectors.
CONNECTINGANINDOOR
DIPOLEANTENNA
Theflexiblefoldeddipoleantenna(300ohm)isforuse
inurbanorhighstrengthsignalareas.Connectthetwo
leadsfromthedipoletotheANTENNA300FMpushcon-
nectors.
Theflexibilityofthetwinflatwireassemblypermitsitto
beplacedundera rug,tackedbehindthestereo...orplac-
edinanyotherconvenientlocation.Insomecases,it
6HOWTOCONNECT

HOWTOCONNECT7

maybenecessaryto"position"theantennaforbestsignal
reception.Thisshouldbedonebeforeitispermanently
located.
Avoidlocatingtheantennanexttootherwiresormetal
objects.Anyindoorantennamaybeineffectiveinhouses
havingmetalsidingormetalfoilinsulation.
AMANTENNA
ForlocalandmostmoderatelydistantAMreceptionthe
built-inferriteloopstickantennamaybeused.The
loopstickismountedona swivelbaseandmustbead-
justedawayfromthechassisforbestreception.
Distancereceptioncanbeimprovedwiththeuseofa
copperantennawire50to150feetinlength.Suspend
thewire,horizontally,ina straightlineashighaspossible.
Attachthewiretoananchorateachendwithsuitable
glassorceramicinsulators.Connecta lead-inwireata
convenientpointontheantenna.Usea lightingarrester
forprotectionwithanoutdoorAMantenna.Thearrester
shouldbewellgroundedtoa groundrodorcoldwater
pipe.
HOWTOCONNECTA MclNTOSHEQUALIZER
POWERAMPINandPREAMPOUTjacksareprovided
ontherearpanelforconnectinga MclntoshEnvironmen-
talEqualizer,orothersignalprocessingequipment.Con-
necttheleftandrightshieldedcablesfromthesignalpro-
cessoroutputstotheLeftandRightPOWERAMPIN
jacks.ThenconnectshieldedcablesbetweentheLeftand
RightPREAMPOUTjackstotheequalizerinputs.
Theinputjacksareautomaticswitchingjacksthat
disconnectthepreamplifier'soutputsignalfromthe
poweramplifier'sinputandconnectsthesignal
processor'soutputwiththepoweramplifier'sinput.
HOWTOCONNECT
ADDITIONALPOWERAMPLIFIERS
Externalpoweramplifiersmaybefedfromthe
MAC4200intwoways:
1.Connecta shieldedcablefromtheLeftandRight
PREAMPOUTjackstotheLeftandRightinputofthe
poweramplifier.ThePREAMPOUTjacksareaffectedby
theVOLUME,EQUALIZER,BALANCEandLOUDNESScon-
trols.BoththeMAC4200amplifierandtheadditional
amplifierwillbefedfromthepreamplifier.IftheMAC
4200amplifierisnotgoingtobeused,inserta pairof
non-shortingphonoplugsinthePOWERAMPINjacksto
disconnectitfromthepreamplifieroutput.
2.TheTAPE1 orTAPE2 OUTjacksmaybeusedto
driveanexternalamplifierwhichhasitsowncontrols.The
outputofthesejacksisnotaffectedbytheVOLUME,
EQUALIZER,BALANCEandLOUDNESScontrolsonthe
receiver.A suggestedusewouldbetofeedanamplifier
ina remotelocationwherevolumeandtonere-
quirementsneedtobecontrolledattheremoteamplifier
Inthisconfiguration,theTAPE1 connectionscannotbe
usedfora taperecorder.
HOWTOCONNECTREMOTESCAN
Theremotescanswitch/cableassemblyplugsintothe
rearpanelREMOTESCANinputjack.Thecableassembly
isa Mclntoshaccessory(PartNo.045-515}availablefrom
yourdealer.
8HOWTOCONNECT