McIntosh Mac 1700 User manual

OWNER'S MANUAL
STEREORECEIVER
MAC1700

Toinsureyourenjoymentpleasereadandcarefullyfol-
lowtheseinstructions.ThetimespentwillmakeItpossible
foryoutoenjoythousandsofhoursofmusicalenjoyment.
Ifyouareina hurryreadpage4 first.Thisgivesyoua
briefoutlineofwhateachcontrolandindicatordoes.
Readingtimeforthismanualis30minutes.Thisistime
wellspent.
CONTENTS
GENERALDESCRIPTION1
SPECIFICATIONS3
IFYOUAREINA HURRY4
CABINETINSTALLATION5
INSTALLATION-CONNECTIONS7
COMPLETESYSTEMHOOK-UP9
BLOCKDIAGRAM10
FRONTPANELINFORMATION12
BALANCINGYOURSYSTEM15
ENJOYINGYOURSYSTEM16
GUARANTEECover

GENERALDESCRIPTIONMAC1700
TheMAC1700isa stereoreceiver.Therearethree
easytousetopnotchstereocomponentsinonesmall
convenientpackage.A solidstatepreamplifier,a solid
statepoweramplifier,andanFMMPXstereotunerare
combinedtogiveyouthebestperformancepossible.
Theresultisa compact,easytousestereoinstrument.
Astereoinstrumentthatbringsyouthebestinalltypes
ofstereolistening.
Aloudnesscontrolallowsyoutolistentomusicatlow
listeninglevelsandstillhearthefullrichsoundofmusic.
Thereisa filterwhichletsyouminimizenoiseandrumble
fromprogramsources.A tapemonitorswitchletsyou
monitorrecordingsinprogress.Buttheprimefunction
ofa preamplifieristoreproducerecordsandtapes
withfullaccuracyandsonicrealism.YourMAC1700
doesrecreatemusicfromrecordsandtapeswitha
degreeofaccuracythoughtimpossiblea fewshort
yearsago.Recordsandtapesaremadewiththebass
frequenciescutandthehighsboosted.Thisallows
moremusicalinformationtobeputontherecordor
tape.TheMAC1700reintroducesthebassandthe
highsfollowingaccurateanddefinitestandards.Your
recordsandtapessoundaliveandthrillingwhenyou
hearthemthroughyourMAC1700.Sixteensilicon
planartransistorsareusedinthepreamplifier.Silicon
planartransistorsareusedbecauseoftheirhigh
thermalstability,lownoise,andsuperiorhighfre-
quencyresponse.
POWERAMPLIFIER
YourMAC1700delivers40wattsofpowerwithboth
channelsoperating.Thisis40wattsofsteadystate
power.YourMAC1700delivers40wattsofpower
hoursonend.Distortionat40wattsislessthan¼ of
1% atanyfrequencyfrom30to20,000cps.These
measurementsaremadebytestingsinewavepower.
Asinewavesignalisfedintotheamplifierata voltage
sufficienttodrivetheamplifieratratedpoweroutput.
Thendistortionismeasuredatfullratedpowerwith
bothchannelsoperatingintoanimpedanceof8 ohms.
Distortionmustbelessthan¼ of1 % from30to
20,000cps.OnlythenisyourMAC1700readyfor
you.Atlessthanfullpowerdistortionbecomessosmall
itcanbemeasuredbyonlythemostsophisticated
laboratoryinstruments.OnlyMclntoshgivesyouthis
kindofperformance.
TheMAC1700givesyoua 2.5microvoltFMstereo
tuner.Thissensitivetunerbringsyouclear,noise-free
receptionfromdistantstations.Thetunersectionisa
superbproductofprideofcraftsmanship.Ina tuner
1

eachwiremustbeplacedcorrectly,eachleadmustbe
thepreciselengthandeachcapacitormustbeinan
exactposition.Soeachwire,eachcapacitor,eachlead
ischeckedandrecheckedformaximumperformance.
ThisassuresyouofthebestpossibleFMstereo
reception.
Thetunersectionusessixtubesandtwotransistors.
TubesasRFamplifiersstillgivemaximumsensitivity
withthegreatestoverloadprotection.
TheMPXsectionoftheMAC1 700uses2 transistors
andtwotubes.IntestaftertestthisparticularMPX
sectionout-performedallotherdesigns.Thechannel
separationoftheMPXsectionisbetterthanthechan-
nelseparationfoundwithmostphonocartridges.The
distortionoftheMPXsectionislessthanwhattheFCC
requiresFMstationstomaintain.Youwillhearallthere
istohearfromstereobroadcasts.
SPECIALFEATURES
Apoweroutputmonitoringcircuitpreventsfailureof
thepoweroutputtransistorsduetoa speakershort
circuit,opencircuit,orincorrectlowimpedance.
Alltransistorshavea safepowerdissipationarea.This
areaiscalledthe"safeoperatingarea."Ifa transistor
dissipatespowerbeyondits"safeoperatingarea"it
destroysitself.YourMAC1700hasa poweroutput
monitoringcircuitthatpreventstheoutputtransistors
fromexceedingtheir"safeoperatingarea."When
yourMAC1700operatesnormallythepowermonitor-
ingcircuithasnoeffectonsignalsgoingthroughthe
poweramplifier.If,however,thepowerdissipationin
theoutputtransistorsbecomesexcessiveduetospeaker
shortcircuit,opencircuit,ora very lowimpedance
load,themonitortransistorssensethisthroughsam-
plingdevicesintheoutputcircuit.Themonitortran-
sistorsrestrictthedrivetotheoutputtransistors.The
restrictingoperationofthepowermonitoringcircuitis
immediateforanyinputsignalorloadcombination.
Thisarrangementassurescompletecircuitreliabilityfor
allloadconditions.Themonitoringcircuitprovides
anextramarginofprotectionforyourMAC1 700.The
monitoringcircuitpreventsfailureofthepoweroutput
transistorsduetoshortcircuit,opencircuit,orincorrect
lowimpedanceload.
Thepowertransistorsaremountedonoversizedano-
dizedheatsinks.Theheatsinksassurea lawtempera-
tureforoperationofthetransistors.Iftemperatures
increaseduetoa shortedspeaker,orrestrictedventila-
tionthenanautomatictemperatureswitchturnsoffyour
MAC1700.TheswitchwillturnyourMAC1700on
againwhenthetemperaturehasdecreasedtoa value
suitablefornormaloperation.Thisadditionalfeature
givesyourMAC1700reliabilityunderthemostextreme
operatingconditions.Thepowertransistorsusedin
theoutputsectionofyourMAC1700areselectedfor
theirhighpowerdissipationcapability,widefrequency
response,andlarge"safeoperatingarea."Inaddi-
tion,eachpowertransistorisgivenfourseparatetests
beforeitisputinyourMAC1700.Thisadditional
testingassuresyouoffullratedpowerfrom30to
20,000cps.
Nowsitbackandrelaxwiththeknowledgeyouhave
"THEBEST."
2

TECHNICALFEATURESANDSPECIFICATIONSFORMAC1700
FMTUNERSECTION:
USEABLESENSITIVITY(at100%Modulation:2.5µV
[I.H.F.Standards)
SIGNALTONOISEANDHUMRATIO:65db.
HARMONICDISTORTION:Mono,lessthan.5%
Stereo,lessthan.8%
DRIFT:Lessthan25KC
FREQUENCYRESPONSE:Flatfrom20cpsto20KC
withstandard75µ secondde-emphasisand19KC
pilotfrequencyfilter.
CAPTURERATIO:Betterthan2.0db.
IMAGEREJECTION:Betterthan60db.
STEREOMULTIPLEXSEPARATION:Betterthan30db
at 1KC.
SPECIALFEATURES:
A)Automaticstereoswitching.
B)Muting;IFinjectedcircuitwithatleast50db
quietingbetweenstations.
C)Antennainputsfor300ohmbalanced(fortwin
lead)and75ohmunbalanced(forcoaxialcable).
D)NuvistorRFamplifier,Nuvistormixer.
E)FourstagesofIFamplification,withAGCused
toinsurelimitingoccursonlyinthelimiterstages.
F)Twolimiterstagesusedforexceptionalcapture
ratioandsmoothmutingoperation.
G)MultiplexfilterandSCAfilter,tosuppress19KC
and38KCsignalcomponentsatleast40dbbe-
lowprogramandtosuppress67KCSCAby60db.
H)Noiserejectinglogiccircuitusedtoactivate
MPXstereolightandautomaticstereoswitching
on19KCstereopilotonly.
I)D'Arsonvaltuningmeterforaccuratecenterof
channeltuning.
J)Flywheeltuningforeaseofoperationandpre-
cisetuning.
AMPLIFIERSECTION:
POWEROUTPUT:
40wattsRMScontinuousperchannelwithbothchan-
nelsoperatingsimultaneouslyinto4 ohmor8 ohm
loads.
80wattsRMScontinuousmonophonic.
30wattsRMScontinuousperchannelwithbothchan-
nelsoperatingsimultaneouslyinto16ohmloads.
60wattsRMScontinuousmonophonic.
HARMONICDISTORTION:Lessthan0.25%atrated
poweroutputfrom30cpsto20KCwithbothchan-
nelsoperating.
INTERMODULATIONDISTORTION:Lessthan0.25%
foranycombinationoffrequenciesfrom30cpsto
20KCifinstantaneouspeakpoweris80wattsper
channelorlessinto4 or8 ohmloadsand60watts
perchannelorlessinto16ohmloadswithboth
channelsoperating.
FREQUENCYRANGE:Atratedoutputbothchannels:
±0.5db20cyclesthrough20,000cycles.
+0,- 3db10cyclesthrough80,000cycles.
OUTPUTIMPEDANCE:4 ohms,8 ohms,16ohms,no
impedanceswitchingrequired.
INTERNALIMPEDANCEDAMPING:Lessthan.04
ohms;dampingfactorgreaterthan100.
INPUTSENSITIVITYANDIMPEDANCE:Auxiliary,
Tape,Tuner,andTapeMonitor;300MV,250K
ohms.
PHONO1 ANDPHONO2:2.4MV,47,000ohms.
TAPEHEAD:2.4MV,½ megohm.
TOTALNOISE(IncludingPowerAmplifier):
HighLevelInputs:75dbbelowratedoutput.
LowLevelInputs:76dbbelow10MVinput;equiv-
alenttolessthan1.5microvoltsatinput.
POWERAMPLIFIER:90dbbelowratedoutput.
TAPEOUTPUT:Tuner1.5volts,otherinputs300MVat
ratedsensitivity,1.3voltswith1 0 MVatphonoinput.
BASSCONTROLS:± 1 8dbat20cycles,withfriction
clutchforindependentadjustmentforeachchannel.
TREBLECONTROLS:±18dbat20,000cycleswith
frictionclutchforindependentadjustmentofeach
channel.
TAPEMONITORSWITCH:NormalorTapeMonitor,
indicatorlamplightsin"Monitor"position.
SPEAKERSWITCH:SpeakersONorOFFforhead-
phonelistening.
FILTER:Flator5,000cycleand60cyclecutoffat12db
peroctave.
LOUDNESSSWITCH:Normalorcompensated.
HEADPHONEJACK:Forlowimpedancestereohead-
phones.
INPUTSELECTOR:6 positions;AUX,TAPE,TUNER,
PHONO1,PHONO2,TAPEHD.
MODESELECTOR:Twopositions;Mono-Stereo
SEMICONDUCTORCOMPLEMENT:
Preamplifier16SiliconTransistors
PowerAmplifier1 8 SiliconTransistors
12Diodes
FMTUNER
8Tubes,4 Transistors,1 0 Diodes
PowerSupply8 Rectifiers
1ZenerDiode,1 Transistor
POWERREQUIREMENTS:1 1 7 volts,AC,50/60cycles,
70-270watts
MECHANICALSPECIFICATIONS:
SIZE:Frontpanel,16incheswideby5½incheshigh;
Chassis,15incheswideby51/8incheshighby14½
inchesdeep,includingconnectors.Clearanceinfront
ofmountingpanelincludingknobs,1 ½ inches.
WEIGHT:34poundsnet,47poundsin
shippingcarton.
FINISH:FrontPanel,Anodizedgoldandblack.
3

1InputSelector. . . Aux. . . foranydevicecon-
nectedtotheAUXinputontheback,TAPE
.. . listentoplaybackfroma taperecorder.
FMAUTO, . . listentoFMStereoorMono
broadcastautomatically. . . PhonoI andPhono
2forphonographrecords.TAPEHD. . . listen
toa tapeplayerthathasn'tanyelectronics.
2Tuneforcenterofblackarea.
3Adjusttodesiredvolume.Poweroff.Turnsthe
systemonoff.
4Tuning. . . selectdesiredstation.
5Treble. . . modifieshighfrequencysounds.Set
toyourtaste.
6Bass. . . modifieslowfrequencysounds.Setto
yourtaste.
7Headphone...toconnecta setoflowimped-
ancestereoheadphones.
8Loud. . . usethisswitchtocompensateforlow
volumelisteningandstillhearfullfrequency
range.
9FilterIn. reduceshighfrequencynoisesuch
asrecordsurfacenoiseandreduceslowfreq-
uencynoisesuchasturntablerumble.
10MutingIn...eliminatesinterstationnoise.
MutingOut. . . usetoreceiveweakstations.
11TapeMon. . . monitorpositionusedtomonitor
arecordingwhenusedwitha taperecorder
withseparateplaybackandrecordheads.
MUSTBEINOUTPOSITIONFORNORMAL
LISTENING.
12Stereo. . . Mono. . . Settostereoforallstereo
programmaterial.Monopositionforallmono
material.
13Balance...tomakeonespeakerlouderthan
theother.Permitsyoutoadjustforunequal
soundcausedbyroomacousticsorprogram
material.
14WilllightonlyonstationsbroadcastingMPX
stereo.
4

CABINETINSTALLATION
TheMAC1700canbeinstalledinfurniturecabinets,orcustom
builtinstallations.Iftheunitistobeusedona shelfortable
top,mountitintheattractiveMAC15WOcabinet.
Allowsufficientcabinetspaceforaircirculation.Minimum
internalcabinetdimensionsshouldbe157/16incheswide,
135/8inchesdeep,and4¼incheshigh.Thebackofthe
cabinetshouldbeleftasopenaspossibleforventilation.
Properventilationwillinsureyourreceivera longtroublefree
life.A fantocirculatetheairwillfurtherincreasethelifeof
yourreceiver.
TheMAC1 700installseasilyfromthefrontofthecabinetinto
apanelcutout.Frontpanelsofanythicknesscanbeused.
FourscrewsintothebottomoftheMAC1700throughthe
mountingshelfholdtheunitfirmlyinplace.Duetotheweight
oftheMAC1700werecommendtheunitrestona wooden
shelfofatleast½"thickness.UnlesstheMAC1 700isade-
quatelyheldinplaceverticalmountingshouldnotbeat-
tempted.Ifverticalmountingisuseda fandelivering50
cubicfeetperminutemustbeused.
SincetheMAC1700mustrestona shelf,locatethecutout
fromthebackofthepanel.A templatetohelpyoumake
mountingeasyisinthepacketthatcontainstheownersmanual.
5

1Onthebackofthecabinetpanel,scribea vertical
linethroughtheexactcenteroftheareatobe
cutout.
2Placethetemplateagainstthebackofthepanel.
Matchthetemplatecenterlinewiththescribed
centerline.Thebottomofthetemplatemustreston
theshelf.
3Oneachsideofthecenterlineofthetemplate
therearetwoholesmarkedllB."Thesearethe
"LOCATINGHOLES."Theseholesareusedto
locatethefrontpaneloftheMAC1 700withref-
erencetotheshelfbehindthecabinetpanel.Toin-
suretheMAC1700willrestonthecabinetshelf,
followtheseinstructionscarefully.
4Markthebackofthecabinetpanelwitha pointed
instrumentthroughthetwo"B"LOCATINGHOLES.
Drillthesetwoholesthroughthecabinetpanelwith
a3/16"diameterdrill.Becertainthedrillisper-
pendiculartothepanel.
5Positionthetemplateonthefrontofthepanel.
Alignthe"C"holesinthetemplatewiththedrilled
holesinthecabinetpanel.
6Markthe"A"cornercutoutsin thetemplate.Join
thecornermarkers.Theedgeofthetemplatecan
beusedasa straightedge.
7Cutouttherectangularopening.
8Taketheshelftemplateandfoldalongthedotted
line.Putthedottedlineagainstthebackofthe
frontmountingpanel.Alignthecenterlineofthe
shelftemplatewiththescribedfrontpanelcenter-
line.
9Markholes"A"and"B."Drilltheholesusinga
¼"to½"bit.Thelargeryoumaketheholesthe
morelatitudeyouwillhavetopositiontheMAC
1700.
10Scribethesuggestedcutoutoutline.Cutoutthe
area.
11 PreparetheMAC1700formountingby removing
thefourplasticfeetfastenedunderthechassis.
12TheMAC1700isinstalledfromtheFRONTofthe
cabinet.InserttheMAC1700powercordthrough
therectangularopeningofthecabinetpanel.
CarefullyslidetheMAC1 700throughtheopening.
ContinuetoslidetheMAC1 700untilitsfrontpanel
isagainstthecabinetmountingpanel.
13SecuretheMAC1700tothemountingshelfusing
thescrewssuppliedinthehardwarepackage.
14ConnecttheMAC1700totherestofthesystem.
6

INSTALLATION
CONNECTIONSTOYOURMAC17OO
CONNECTINGTHEPHONO1 POSITIONforyourmainrecordplayer
Connectthe "left"channelto the"L" inputof PH 1. Connect
the"right"channeltothellR"inputofPH1.Ifyourrecord
playerhasa groundwireconnectthegroundwiretoGND.
CONNECTINGTHEPHONO2 POSITION
Phono2 positioncanbeusediftworecordplayersareusedin
asystem.Connectthe"left"channeltothe"L"inputofPH2.
Connectthe"right"channeltothe"R"inputofPH2.
CONNECTINGTAPEPLAYER(nopreamplifierintapeplayer)
Usethispositiononlyfora tapedeckwithnoelectronics.Con-
nectthe"left"channeltothe"L"inputofTAPEHD.Connect
the"right"channeltothe"R"inputofTAPEHD.
CONNECTINGA TAPERECORDERorTAPEPLAYERwithBUILT-INELECTRONICS
Connectthe"left"channelofthetapeplayerortaperecorder
tothe"L"channelTAPEMONITORinput.Connectthe"right"
channelofthetapeplayerortaperecordertothe"R"channel
TAPEMONITORinput.
CONNECTINGA TAPERECORDERWITHTHREEHEADS
ConnectthetapeoutputsoftheMAC1700tothehighlevel
inputsonthetaperecorder.Thiswillmakeitpossibleforyouto
recordfromtheMAC1 700.Connectthetaperecorderoutputs
totheTAPEMONinputsontheMAC1 700.UseTAPEMON. . .
Inforlisteningtopre-recordedtapesaswellastomonitor.
CONNECTINGA TAPERECORDERTORECORDFROMTHEMAC1700
ConnecttheTAPEOUTPUTSoftheMAC1700tothehighlevel
inputsonthetaperecorder.
7

CONNECTINGLOUDSPEAKERSTOTHEMAC1700
The"Left"loudspeakerwiresareconnectedtothetwocenter
screwsonthebarrierstripmarked"LEFTOUTPUT".The"Right"
loudspeakerwiresareconnectedtothetwocenterscrewsonthe
barrierstripmarked"RIGHTOUTPUT".TheMAC1700auto-
maticallymatchestheimpedance.
ANTENNACONNECTIONS
AconvenientflexibleindoorFMdipole(300ohm)antennaissupplied
withtheMAC1 700.Thisantennaiseasytoinstall.Itissuitableforgood
FMreceptioninhighsignalareas.
Connectthetwoleadsofthedipoleantennatothetwoterminalsmarked
"300"onthebackpaneloftheMAC1 700.
Theflexibilityofthethickflatwireletsyoueasilylocatethedipolebehind
theequipment.Openthedipoleintoa "T."Extendthearmsasstraight
aspossible.Thedipoleantennaissomewhatdirectional.Itshouldbe
positionedforbestreceptionofthedesiredstations.
IMPORTANT
OUTDOORFMANTENNA
AnoutdoorFMantennaisrecommended.
Itwillgiveyouthebestreceptionunder
allconditions.Infringeareas,a highly
directionalantennausedwitha rotator
willgivethefinestpossibleFMreception.
Rotatetheantennauntilitpointsinthe
directionofthestationoruntilitreceives
thebestpossiblesignal.
75OHMANTENNA
Anunbalanced75ohmFMantennacan
beusedwiththeMAC1700.Usethetwo
terminalsmarked75.
8
Keepthedipoleawayfromlargemetal
objectsorsurfaces.Theyinterferewith
theefficiencyoftheantenna.
MUTING(ontherearpanel)
Thiscontroldeterminesthestrengthof
signalnecessaryfora stationtobeheard
withthetunerinthemutingposition.The
mutingthreshold iscarefullyadjustedto
optimumatthefactoryusingprecision
testinstrument.Casualadjustmentofthe
mutingthresholdisnotrecommended.
ACOUTLETS
TherearetwoBLACKACoutletsand
oneREDACoutlet.Thepowertothe
blackACoutletsiscontrolledbythe
frontpanelswitch.Usetheseoutlets
foraccessoriessuchasa tapere-
corder.Theredreceptacleisonatall
timesandisusedfora turntableor
recordchanger.Theturntableispro-
tectedbythisarrangement.Itisnec-
essarytoturnofftheturntableorrec-
ordchangerbyitsownACswitch.
ConnecttheACcordfromyourrecord
playertotheREDoutlet.

9

10

HavingcompletedtheinstallationofyourMAC1 700 a
newworldofmusicalenjoymentisyours.Thefollowing
sectiongivesyoua detailedexplanationofallthecontrols
andtheirfunctions.Itwilltellyouhowtoadjust
yourMAC1700formaximumenjoyment.
CustomerService
McINTOSHAUDIOCOMPANY
2ChambersStreet
Binghamton,NewYork13903
11

FRONTPANELINFORMATION
TUNINGDIALSCALES—TheMAC1700hastwodialscales.
ThemegacyclescaleindicatesthepositionofFMstationsinthe
88to108megacycleFMband.Thelineardivisionofthe0-100
loggingscalemakesiteasytoreturntoa stationusinga logging
scalenumber.
INDICATORS—TheMAC1700hastwoindicatorsonthefront
panel.Oneisthetuningmeter.WhenanFMstationiscorrectly
tunedtheindicatorwillbeintheblackareaofthemeter.The
actionoftheTUNINGindicatorisindependentofstationsignal
strength.ThesecondindicatoristheSTEREOINDICATOR.The
STEREOINDICATORwilllightonlywhenthedialpointercrosses
astationbroadcastingmultiplexstereo.
VOLUMEON-OFF—UsetheVOLUMEcontroltoadjustthevol-
umetoa desiredlisteninglevel.TurntheVOLUMEcontrolclock-
wisetoincreasethevolume.Fullcounterclockwiserotationturns
theunitoff.
TREBLE—TheTREBLEcontrolisa dualcontrol.Thesmallknob
controlsthetrebleintheleftchannel.Thelargeknobcontrols
thetrebleintherightchannel.Thetwoknobsarefriction
coupled.Theycanbeadjustedtogetherorseparately.Turn
clockwisetoincreasetreble.Turncounterclockwisetodecrease
treble.
BASS—TheBASScontrolisa dualcontrol.Thesmallknobcon-
trolsthebassintheleftchannel.Thelargeknobcontrolsthe
bassintherightchannel.Thetwoknobsarefrictioncoupled.
Theycanbeadjustedtogetherorseparately.Turnclockwiseto
increasebass.Turncounterclockwisetodecreasebass.
12

HEADPHONE—Theheadphonejackisforusewithlowim-
pedanceheadphones.WiththeswitchintheSPEAKEROFF
positiontheloudspeakerswillturnoffwhenyouinsertyourhead-
phonejack.WiththeswitchintheSPEAKERONpositionthe
loudspeakerswillremaininthesystem.
LOUD...Anabbreviationofloudness
OUT. . . Thisisthenormalpositionformoderatetoloud
listeninglevels.UsetheLOUD...INpositiontolistentolow
listeninglevels.Itwillallowyoutohearthefullfrequency
range.Withthevolumeturneddownthereisanapparentloss
ofbassandtrebleresponse.Whenthevolumeislowthe
humanear'sresponsetobassandtrebledecreasesmore
rapidlythanitsresponsetonotesinthemid-range.TheLOUD
controlautomaticallybooststhebassandtreble.Withthe
switchINthebassandtrebleareheardincorrectproportion
tothemid-rangeatlowlisteninglevels.
FILTER(CombinationHighFrequencyandLowFrequency)
Usethefilterswitchtoreducebothhighfrequencyandlowfre-
quencynoise.
OUT. . . Filterdisconnectfornormalflatcyclesandlowfre-
quencyresponse.
ontothetapeattherecordhead.Thesignalfollowsa difficult
path...thetapeisplayedbytheplaybackhead. . . through
theplaybackpreamplifierinthetaperecorder. . . outofthe
taperecorderintothetapemonitorinputsontheMAC1700
.. . thenthroughthepoweramplifieroftheMAC1 700andto
theloudspeakers.
CAUTION:IFTHEMONITORLIGHTISONSWITCHTOTHE
OUTPOSITIONFORNORMALLISTENING.
STEREOMON.
Stereo. . . forallnormalstereolistening.
Mono...forallnormalmonophoniclistening.
IN...reducehighfrequenciesabove5,000cyclesandlow
frequenciesbelow50cycles.
MUTING
IN...turnsonthemutingcircuit.Mutingsuppressesback-
groundhissandnoiseusuallyheardwhentuningbetween
stations.Weakordistantstationsthatcannotoverridethe
backgroundnoiseandinterferencearesuppressedbythe
muting.
OUT. . . turnsoffthemutingtoallowconventionaltuning.
Interstationnoisewillbepresent.Usethissettingtolistento
weakordistantstationsthathavenoiseorinterference.
TAPEMON.
TheMAC1700tapeswitchmakesitpossibletoinstantlycom-
parerecordedmaterialwiththesourcesignal.Tapejacksonthe
backpanelaccepta signalfroma taperecorderwitha monitor
headandpreamplifier.Addlightinformation.
OUT. . . theprogramsourceisfedthroughtheMAC1 700to
theloudspeakers.
IN...theprogramsourceisfedfromtheMAC1 700tothe
tapeoutputjackstothetaperecorder.Thesignalisrecorded
13

BALANCE
UsetheMAC1700BALANCEcontroltobalance
unequalvolumeintheleftandrightchannels.
Left. . . turningthecontroltoleftaccentsthe
leftchannelbyreducingtherightchannel
output.
Right. . . turningthecontroltotherightac-
centstherightchannelbyreducingtheleft
channeloutput.
INPUTSELECTOR
Selectanyoneofsixprogramsourceswiththisswitch.
FMAUTO. . . Usethispositiontolistentoall
FMbroadcasts.Thetunerwillautomatically
switchtostereoonallstationsbroadcasting
stereo.Thetunerwillreturntomonooperation
whenyoutuneina stationbroadcastingmono.
TAPE:. . . Anyself-containedtaperecorder
(onewithbuilt-inplaybackelectronics.)
PHONO1 ...connectstheMAC1700for
stereoandmonophonicoperationofrecords.
PHONO2 ...SomeasPHONO1.
TAPEHD. . . A tapedeckthatdoesnotcon-
tainitsownplaybackpreamplifieriscon-
nectedtotheMAC1700throughtheTAPE
HDposition.
AUX. . . anyauxiliaryservicerequiringflat
amplification,suchasa televisionset,ortape
recorders.
NOTE:OWNERSOFTAPERECORDERSWITH
SEPARATERECORDANDPLAYBACKHEADS
USETHETAPEMONITORPOSITIONTO
PLAYBACKPRE-RECORDEDTAPES.
14

SETTINGYOURCONTROLS...
astereosystem
ADJUSTINGPHASE
1SettheMONOSTEREOswitchtoMONO.
Theperformanceandenjoymentofyourstereosystemincreaseswhenthesys-
temisbalanced.Therearetwofactorsinbalancing.Oneisunequalprogram
loudnessontheleftandrightchannelsoftheprogramsource.Theotherisbasic
systembalance.ThecontrolmarkedBALANCEontheMAC1700isusedtocor-
rectbothoftheseproblems.
Firstbalancethesystem.Therearemanythingswhichaffectthebalanceof
yoursystem:roomacoustics,furnitureplacement,roomshape,smalldifferences
inloudspeakers,etc.
TOBALANCESYSTEM
1SetthestereomonoswitchtoMONO.
2Playa familiarrecording.
3Turnthebalancecontroltothe1 2 o'clockposition.
4Whiletheprogramisplaying,standinthecenterofthetwo
loudspeakers.Listentoseeifthereisa differenceinloudness
fromeitherspeaker.Thesoundshouldcomefroma pointmid-
waybetweenthespeakers.Ifitdoesnot,turnthecontrolto-
wardthespeakerthatisnotasloudastheother.Dothisuntil
youfindthepointwherethesoundcomesfromthemid-point
betweenthespeakers.Ifitisimpossibletogetthesoundto
comefromthemid-pointgoontoADJUSTINGPHASE.After
youhaveadjustedthephaseyoucanstartthebalancingpro-
cedureoveragain.
2Standabout10feetinfrontofandmidwaybetweenyour
loudspeakers.Thesoundshouldappeartobedirectlyinfront
ofyou.Havesomeoneswitchtheleadsononespeaker.Besure
toswitchtheleadsonONEspeakeronly.Ifthesoundisnot
directlyinfrontofyoureversetheleadsononeloudspeaker.
Whenthesoundcomesfromthemid-pointbetweenthe
speakerstheyareinphase.
15

YOURSYSTEM
LISTENINGTOA STEREORECORD
LISTENINGTOMONOPHONICRECORDS
LISTENINGTOTAPEDECKS
LISTENINGTOA STEREOTAPERECORDER
WITHITSOWNPLAYBACKPREAMPLIFIER
LISTENINGTOA STEREOTAPERECORDER
USINGA TAPERECORDERWITHTHREEHEADS
ANDSEPARATEPLAYBACKPREAMPLIFIER
MONITORINGWHILERECORDING
1TurntheINPUTSELECTORtoPHONO1 orPHONO2,which-
everisconnectedtotherecordplayeryouwishtohear.
2SettheMONOSTEREOswitchtoSTEREO.
3AdjusttheVOLUMEcontroltothedesiredvolume.
1TurntheINPUTSELECTORTOPHONO1,orPHONO2,which-
everisconnectedtotherecordplayeryouwishtohear.
2TurntheSTEREOMONOswitchtoMONO.
3AdjusttheVOLUMEcontroltothedesiredvolume.
1TurntheINPUTSELECTORtoTAPEHD.
2TurntheSTEREOMONOswitchtoSTEREO.Ifa monotape,
turnthebalancecontroltothesideyouwanttohear.
3AdjusttheVOLUMEcontroltothedesiredvolume.
Astereotoperecorderwithitsownplaybackpreamplifiershould
bepluggedintheAUXINPUT. . . NOTTHETAPEHD.INPUT.
TheAUXinputisused-
1TurntheINPUTSELECTORTOAUX.
2SwitchtheSTEREOMONOswitchtoSTEREOorMONOde-
pendingontheprogramonthetape.
3AdjusttheVOLUMEcontroltothedesiredvolume.
TolistentotapesconnectyourtaperecordertotheTAPEMON
inputsontherearoftheMAC1700.
1SwitchTAPEMONto"IN."
7SwitchtheSTEREOMONOswitchtoSTEREOMONOdepend
ingontheprogramonthetape.
3AdjusttheVOLUMEcontroltothedesiredvolume.
Tomonitorwhilerecordingyourtaperecordermusthavesep-
araterecordandplaybackheadsaswellasseparateplayback
preamplifiers.TheTAPEMONOswitchletsyoumonitorthequality
oftaperecordingmadefromtheMAC1700duringtheprocess
ofrecording.WhentheTAPEMONOswitchisintheINposition
itwillplaythesoundfromthetapeasitpassestheplayback
head,a momentafteritisrecorded.Therecordingprocesscon-
tinuesasusual.WhentheswitchisintheOUTpositionnormal
programfromthesourceisheard.
BE122003
038-210
16

YourMAC1700stereoreceiverwillgiveyoumanyyearsof
pleasantandsatisfactoryperformance.Ifyouhaveanyquestions
concerningtheoperationormaintenanceofthisreceiverpleasecontact:
GUARANTEE
MclntoshAudioCompanyguaranteesthisequipmenttoperform
asadvertised.Wealsoguaranteethemechanicalandelectrical
workmanshipandcomponentsofthisequipmenttobefreeof
defectsfora periodof90daysfromdateofpurchase.Thisguar-
anteedoesnotextendtocomponentsdamagedbyimproperuse
nordoesitextendtodamageincurredduringtransportationtoand
fromMclntoshAudioCompany.
TWOYEARFACTORYSERVICECONTRACT
Anapplicationfora FreeTwoYearFactoryServiceContractis
includedinthepacketwiththismanual.TheFreeTwoYearFactory
ServiceContractwillbeissuedbyMclntoshAudioCompanyupon
receiptofthiscompletelyfilledoutregistrationform.Thetermsof
thiscontractaredefinedintheTwoYearFactoryServiceContract.
IfthisapplicationisnotmailedtoMclntoshAudioCompany,only
theserviceofferedunderthestandard90dayguaranteewillapply
tothisequipment.
TAKE ADVANTAGE OF 2 YEARS OF FREE FACTORY
SERVICE BY FILLING IN THE APPLICATION NOW
CUSTOMERSERVICE
MclntoshAudioCompany
2ChambersStreet
Binghamton,NewYork13903
Ourtelephonenumberis723-3512
Theareacodeis607

Precisioncraftsmanshipandpainstakingat-
tentiontofinestaccuraciesmaketheMAC
1700meethighstandards.
MCINTOSHAUDIOCOMPANY
2ChambersSt.,Binghamton,N.Y.
MADEINU.S.A.
Phone-AreaCode607-723-3512
Designsubjecttochangewithoutnotice.