McIntosh MC7108 User manual

MC7108
EIGHT
CHANNEL
POWER
AMPLIFIER

MC7108
EIGHT
CHANNEL
POWER
AMPLIFIER

IMPORTANT
SAFETY
INSTRUCTIONS
THESE
INSTRUCTIONS
ARETOPROTECT
YOUANDTHE
MclNTOSH
INSTRUMENT.
BESURETO
FAMILIARIZE
YOURSELF
WITHTHEM
Copyright1993© by
MclntoshLaboratoryInc.
2
WARNING:THISUNITISCAPABLEOFPRODUCINGHIGHSOUND
PRESSURELEVELS.CONTINUEDEXPOSURETOHIGHSOUND
PRESSURELEVELSCANCAUSEPERMANENTHEARINGIMPAIRMENT
ORLOSS.USERCAUTIONISADVISEDANDEARPROTECTIONIS
RECOMMENDEDWHENPLAYINGATHIGHVOLUMES.
Theexclamationpointwithinanequilateraltriangleisintendedtoalerttheusertothe
presenceofimportantoperatingandmaintenance(servicing)instructionsintheliterature
accompanyingtheappliance.
CAUTION:TO PREVENT THE RISK OF ELECTRIC SHOCK,DONOT
REMOVECOVER(ORBACK).NOUSER-SERVICABLEPARTSINSIDE.
REFERSERVICINGTOQUALIFIEDPERSONNEL.
Thelightningflashwitharrowhead,withinanequilateraltriangle,isintendedtoalertthe
usertothepresenceofuninsulated"dangerousvoltage"withintheproduct'senclosure
thatmaybeofsufficientmagnitudetoconstitutea riskofelectricshocktopersons.
17. CAUTION: TO PREVENTELECTRICALSHOCK DO NOTUSETHIS(POLARIZED)PLUG
WITHANEXTENSIONCORD,RECEPTACLEOROTHEROUTLETUNLESSTHEBLADESCAN
BEFULLYINSERTEDTOPREVENTBLADEEXPOSURE.
ATTENTION:POURPREVENIR LES CHOCSELECTRIQUES PAS UTILISERCETTE
FICHEPOLARISEEAVECUNPROLONGATEUR,UNEPRISEDECOURANTOUUNEAUTRE
SORTIEDECOURANT,SAUFSfLESLAMESPEUVENTETREINSEREESA FONDSANSEN
LAISSERAUCUNEPARTIEA DECOUVERT.
1.Readallinstructions- Readthesafetyandoperatinginstructionsbeforeoperatingtheinstrument.
2.RetainInstructions- Retainthesafetyandoperatinginstructionsforfuturereference.
3.Heedwarnings- Adheretowarningsandoperatinginstructions.
4.FollowInstructions- Followalloperatinganduseinstructions.
WARNING:TOREDUCE RISK OFFIREORELECTRICALSHOCK,DONOTEXPOSE THIS IN-
STRUMENT TO RAIN OR MOISTURE.
5.PowerSources- Connectthepowersupplyonlytothetypedescribedintheoperatinginstructions
orasmarkedontheunit.
6.Power-CordProtection- Routepower-supplycordssothattheyarenotlikelytobewalkedonor
pinchedbyitemsplaceduponoragainstthem,payingparticularattentiontocordsatplugs,
conveniencereceptacles,andthepointwheretheyexitfromtheinstrument.
7.Ventilation- Locatetheinstrumentforproperventilation.Forexample,theinstrumentshouldnot
beplacedona bed,sofa,rug,orsimilarsurfacethatmayblockventilationopenings;or,placed
ina built-ininstallation,suchasa bookcaseorcabinet,thatmayimpedetheflowofairthrough
theventilationopenings.
8.Heat- Locatetheinstrumentawayfromheatsourcessuchasradiators,heatregisters,stoves,or
otherappliance(includingamplifiers)thatproduceheat.
9.WallorCabinetMounting- Mounttheinstrumentina wallorcabinetonlyasdescribedintheowner's
manual.
10.WaterandMoisture- Donotusetheinstrumentnearwater- forexample,neara bathtub,washbowl,
kitchensink,laundrytub,ina wetbasement,orneara swimmingpool,etc.
11.Cleaning- Cleantheinstrumentbydustingwitha drycloth.Cleanthepanelwitha clothmoistened
witha windowcleaner.
12.ObjectandLiquidEntry- Donotpermitobjectstofallandliquidstospillintotheinstrumentthrough
enclosureopenings.
13.NonusePeriods-UnplugthepowercordfromtheACpoweroutletwhenleftunusedfora longperiod
oftime.
14.DamageRequiringService- Servicemustbeperformedbyqualifiedservicepersonnelwhen:
A.Thepowersupplycordortheplughasbeendamaged;or
B.Objectshavefallen,orliquidhasbeenspilledintotheinstrument;or
C.Theinstrumenthasbeenexposedtorain;or
D.Theinstrumentdoesnotappeartooperatenormallyorexhibitsa markedchangeinperformance;
or
E.Theinstrumenthasbeendropped,ortheenclosuredamaged.
15.Servicing- Donotattempttoservicebeyondthatdescribedintheoperatinginstructions.Allother
serviceshouldbereferredtoqualifiedservicepersonnel.
16.GroundingorPolarization- Donotdefeattheinherentdesignfeaturesofthepolarizedplug.Non-
polarizedlinecordadaptorswilldefeatthesafetyprovidedbythepolarizedACplug.

YourdecisiontoownthispieceofMclntoshStereoEquipmentranksyouattheverytop
amongdiscriminatingmusiclisteners.Younowhave"TheBest".TheMclntoshdedication
to''Quality",isassurancethatyouwillreceivethousandsofhours ofmusicalenjoymentfrom
thisunit.
Pleasetakea shorttimetoreadtheinformationinthismanual.Wewantyoutobeasfamiliar
aspossiblewithallthefeaturesandfunctionsofyournewpieceofMclntosh.Thiswillen-
surethatyoureceivealltheperformancebenefitsthisinstrumentcanofferyou,andthat
itwillbecomea highlyvaluedpartofyourhomemusicsystem.
THANK
YOU
Theserialnumber,purchasedate,andMclntoshLaboratoryServiceContractnumberare
importanttoyouforpossibleinsuranceclaimorfutureservice.Recordthisinformationhere-
SerialNumberPurchaseDate
ServiceContractNumber
Uponapplication,MclntoshLaboratoryprovidesa ServiceContracttotheoriginalpurchaser.
YourMclntoshAuthorizedServiceAgencycanexpediterepairswhenyouprovidetheSer-
viceContractwiththeinstrumentforrepair.
SERVICECONTRACT4
INTRODUCTION5
HOWTOINSTALLTHEMC71085
FRONTPANELDISPLAYS6
REARPANELANDHOWTOMAKECONNECTIONS6,7,8,9,10
CUSTOMINSTALLATIONDIAGRAMS10
SPEAKER-AMPLIFIERCONNECTIONDIAGRAMS11,12,13,14,15,16,17
SPECIFICATIONS18
TABLEOF
CONTENTS
3

TAKEADVANTAGEOF3 YEARSOFCONTRACTSERVICE
FILLINTHEAPPLICATIONNOW.
YourMC7108EightChannelPowerAmplifierwillgiveyoumanyyearsofsatisfactoryperfor-
mance.Ifyouhaveanyquestions,pleasecontact,
MclntoshLaboratoryInc.
2ChambersStreet
Binghamton,NewYork13903-2699
Phone:[phone]
McINTOSH
THREEYEAR
SERVICE
CONTRACT
AnapplicationforA THREEYEARSERVICECONTRACTisincludedwiththismanual.
Thetermsofthecontractare:
1.Iftheinstrumentcoveredbythiscontractbecomesdefective,Mclntoshwillprovideallparts,
materials,andlaborneededtoreturnthemeasuredperformanceoftheinstrumenttothe
originalperformancelimitsfreeofanycharge.Theservicecontractdoesnotcoverany
shippingcoststoandfromtheauthorizedserviceagencyorthefactory.
2.AnyMclntoshauthorizedserviceagencywillrepairailMclntoshinstrumentsatnormal
servicerates.Toreceivethefreeserviceunderthetermsoftheservicecontract,theser-
vicecontractcertificatemustaccompanytheinstrumentwhentakentotheserviceagency.
3.Alwayshaveservicedonebya Mclntoshauthorizedserviceagency.//the instrument is
modified or damaged as a result of unauthorized repair the service contract will be cancell-
ed. Damagebyimproperuseormishandlingisnotcoveredbytheservicecontract.
4.Theservicecontractisissuedtoyouastheoriginalpurchaser.Toprotectyoufrom
misrepresentationthiscontractcannotbetransferredtoa secondowner.
5.UnitsinoperationoutsidetheUnitedStatesandCanadaarenotcoveredbytheMclntosh
FactoryServiceContract,irrespectiveoftheplaceofpurchase.Norareunitsacquired
outsidetheUSAandCanada,thepurchasersofwhichshouldconsultwiththeirdealer
toascertainwhat,ifany,servicecontractorwarrantymaybeavailablelocally.
4

MclntoshLaboratoryhasearneda worldwidereputationforitstechnicalcontributionsto
improvedsoundreproduction.ThetechnicalinnovationsinMclntoshproductshaveintegrity
provenbytime.TheMclntosh"Classic"designisrecognizedasthemostoutstandinginthe
industry.
Mclntoshproductsaredesignedtobemaximumuserfriendlysoanyonecanenjoyusing
them.Theyarealsodesignedforeasymaintenance.ThelegendaryreliabilityofMclntosh
productshasbeena matterofrecordsince1949.
TheMC7108,EightChannel,5-WayPowerAmplifiercanbeoperatedinfivedifferentcon-
figurations.Eachoftheeightchannelscanbeoperatedindividually,inMonopairsorBridged
pairsintoeither8 or4 ohmloads.Eachofthe8 channelsoftheMC7108canproduce40
wattsintoa 4 ohmload.Eachofthe4 bridgedpairscanproduce100wattsinto4 ohmloads.
MC7108OUTPUTOPERATINGCONFIGURATIONS
(4ohmloudspeakerloads)
1.8-40wattchannels
2.6-40wattchannelsand1 - 100wattbridgedpairchannel
3.4-40wattchannelsand2 - 100wattbridgedpairchannels
4.2-40wattchannelsand3 • 100wattbridgedpairchannels
5.4 - 100wattbridgedpairchannels
CHANNELMODES
Eachofthefourpairsofchannelshasathreeposition MODEswitch. InSTEREOmode, each
channelcanbeoperatedasa separatemonoamplifier, oras fourstereopairs. In MONOmode,
the two (separate) stereo signals are combined to mono in each channel. The volume level of
eachmonochannelofthepaircanbecontrolledbyitsownLEVELcontrol. TheBRIDGEDmode
combines the two channels in bridged configuration as described above.
OperatingconfigurationNumber1 isidealfora multi-arearemotecontrolledaudiosystem.
Thefourpairsofchannelsmakeanidealpoweramplifiertooperatethefourremoteareas
controlledbya MclntoshCR10RemoteControlSystem.
OperatingconfigurationNumber1 isalsoidealfora MclntoshHomeTheaterSystemusing
theMC7108togetherwitha MclntoshC39orMX130Audio/VideoControlCenter.A rearpanel
connectoracceptsa 25conductorcomputertypecablethatwillconnecttoa C39orMX130
A/VControlCentertoreceiveallsixchannelsofaudiofora MclntoshHomeTheaterSystem.
EachofthesixaudiosignalsarefedtosixoftheMC7108channelsintheorderspecified
inthemanualsectiondescribingtherearpanelconnections.
OperatingconfigurationNumber4 isidealfora MclntoshHomeTheaterSystemusingthe
MC7108togetherwiththeMclntoshMX118Audio/VideoTunerControlCenter.ThefiveDolby
SurroundProLogic™processedsoundtracksarereproducedinthefollowingmanner.Three
bridged100wattpairscanbeusedfortheLeftFront,CenterandRightFrontloudspeakers.
Theremainingtwo40wattchannelscanbeusedfortheLeftandRightSurroundloudspeakers.
INTRODUCTION
TheMC7108canbeplaceduprightona tableorshelf,standingonitsfourplasticfeet.
Theamplifiercanalsobecustominstalledina cabinetofyourchoice.Themountingpanel
cutout,mountingshelfventilationcutoutandamplifierdimensionsareshowninthediagrams
foundona pagefurtherbackinthismanual.
Alwaysprovideadequateventilationfortheamplifier.Thetroublefreelifeofanyelectronic
instrumentisgreatlyextendedbyprovidingsufficientventilationforpropercooling.
HOWTOINSTALL
THEMC7108
5

HOWTOINSTALL
THEMC7108
Allowatleast1-1/2inches(3,8cm)abovetheheatsinkareatoallowthefreeflow
ofair.Therecommendedminimumdepthformounting,includingclearanceforcon-
nectors,is20inches(51cm)behindthefrontmountingpanel.Clearancerequiredin
frontofthemountingpane!surfaceis1 inch(2.54cm).Ifmountedina customcabinet,
cutouta ventilationholeintheamplifiermountingshelfaccordingtotherecommended
dimensions.
FRONTPANEL
DISPLAY
AfrontpanelRedLEDindicatorisprovidedforeachofthefourpairsofchannels.This
indicatorturnsonwhenthespeakerrelaysforthatspecificchannelpairturnon.
AlleightchannelsoftheMC7108incorporatetheMclntoshPOWERGUARDcircuitwhich
preventsoutputclippingwithitsharshanddamagingdistortion.A frontpanelLEDPower
Guardindicatorisprovidedforeachoftheeightchannels.TheLEDlightswheneverthepower
Guardcircuitisactivatedforanyparticularchannel.Thisindicatesthattheamplifierispro-
ducingitsmaximumundistortedpoweroutput,andthatyouarebeingprotectedfromover-
driveandclipping.TheoutputlevelwherePowerGuardactswillbeweltabovetherated
powerduetoconservativeMclntoshdesignphilosophy.
(If the POWER GUARD indicators turn on and stay on continuously for any given pair of
channels, it indicates a problem is present. If this condition occurs, contact your Mclntosh
dealer for assistance.)
REARPANEL
ANDHOW
TOMAKE
CONNECTIONS
Usehighqualityinputandoutputconnectingcables.Propercableswillinsurereceiving
thebestpossibleperformancefromyourMclntoshsystem.YourMclntoshdealercanadvise
youonthetypesandlengthsofcablesthatwillworkbestinyourinstallation,
Hookupdrawingsareincludedwhichgivegraphicinformationonhowtoconnectthein-
putsandoutputsforeachinstallationconfiguration.Payspecialattentiontothepolarities
ofthespeakerhookups.
Refer to the numbers on the rear panel drawing for the descriptions of the MC71Q8
connections and controls.
1.POWER(ON,OFF/REMOTE)
ONpositionturnstheMC7108ACpoweron.OFF/REMOTEallowstheMC7108ACpower
tobeturnedonbya DCLogic1 controlsignalfroma MclntoshControlCenterorsimilar
compatibleaccessory,tothePOWERCONTROLINconnector.
2.CHANNELS7 and8,IN- OUT
BRIDGED:Connecta cablefroma PreamplifierorControlCenterto7 IN.
STEREO:Connectcablesfromthestereooutputsofa Preamplifier,ControlCenterorother
accessorycomponentto7 INand8 IN.
MONO:Connectcablesfromthestereooutputsofa PreamplifierorControlCenterto7
INand8 IN.ThestereosignalswiltbecombinedtoMonoandfedtoeachamplifierchannel.
ThetwoLEVELcontrolswillworkseparatelyoneachchannel.
The OUTjacks provide a convenient connection to feed the same signals to other chan-
nels on the MC7108, or to any accessory component.
6

3.LEVEL(BRIDGED,STEREOandMONO)
BRIDGED;Useonlythe7 BRIDGEDLEVELcontrolandadjustasdesired.
STEREO:Adjusttheindividual7 and8 LEVELcontrolsasdesired.The2.5Vsettingissug-
gestedwhentheMC7108isbeingusedwitha MclntoshPreamplifierorControlCenter.
MONO:Adjusttheindividual7 and8 LEVELcontrolsasdesired.Thecombined7 and8
Monosignalswillbereproducedbyeachchannel.
4.MODE(BRIDGED,STEREOandMONO)
SettheMODEswitchtothepositionforthedesiredoperatingconfiguration.
5.CHANNELS5 and6,IN- OUT
BRIDGED:Connecta cablefroma PreamplifierorControlCenterto5 IN.
STEREO:Connectcablesfromthestereooutputsofa Preamplifier,ControlCenterorother
accessorycomponentto5 INand6 IN.
MONO:Connectcablesfromthestereooutputsofa PreamplifierorControlCenterto5
INand6 IN.ThestereosignalswillbecombinedtoMonoandfedtoeachamplifierchannel.
ThetwoLEVELcontrolswillworkseparatelyoneachchannel.
The OUT jacks provide a convenient connection to feed the same signals to other chan-
nels on the MC7108, or to any accessory component.
6.LEVEL(BRIDGED,STEREOandMONO)
BRIDGED:Useonlythe5 BRIDGEDLEVELcontrolandadjustasdesired.
STEREO:Adjusttheindividual5 and6 LEVELcontrolsasdesired.The2.5Vsettingissug-
gestedwhentheMC7108isbeingusedwitha MclntoshPreamplifierorControlCenter.
MONO:Adjusttheindividual5 and6 LEVELcontrolsasdesired.Thecombined5 and6
Monosignalswillbereproducedbyeachchannel.
7.MODE(BRIDGED,STEREOandMONO)
SettheMODEswitchtothepositionforthedesiredoperatingconfiguration.
8.8 CHANNELIN
Thisconnectorwillaccepttheoutputsofthesixaudiochannelsofa MclntoshC39or
MX130A/VControlCenterforuseina MclntoshHomeTheaterSystem.Usea male-to-female
25conductorsubminiature"D"(D825)shieldedcomputertypecablefromthe8 CHANNEL
connectortothe25pin6 CHANNELconnectorona MclntoshC39orMX130.Thesixseparate
outputsfromtheControlCenterswillappearattheMC7108inthefollowingchannelalloca-
tion.A powercontrolsignaltoturntheMC7108poweronandoffisalsosentonthecable
fromtheControlCenter.
CHANNEL 1: Center Front
CHANNEL 2: Left Surround
CHANNEL 3: Left Front
CHANNEL 4: Right Front
CHANNEL 5: Subwoofer
CHANNEL 6:RightSurround
Connectdiscretecablesfroma C39orMX130Area"B"OUTPUTStochannels7 and
8todriveloudspeakersintheremoteArea"B".
9.POWERCONTROL,IN/OUT
TheMC7108ACpowercanbeturnedonandoffbya controlsignalfedtothePOWER
REARPANEL
ANDHOW
TOMAKE
CONNECTIONS
7

REARPANEL
ANDHOW
TOMAKE
CONNECTIONS
CONTROLINconnectorfromthePOWERCONTROLOUTconnectoroncompatibleMcln-
toshproducts.TheMC7108POWERCONTROLOUTjackwillfeedthesameACpowercon-
trolsignalout,delayed0.2seconds,toturnonandoffanotheraccessorycomponentwith
acompatiblePowerControlinput.
TheMC7108POWERswitchmustbeintheOFF/REMOTEsettingforthepowercontrol
signalstoturntheMC7108OnandOff.
The POWER CONTROL connectors are standard 1/8 inch mini phone plugs. Only the tip
and sleeve are used for connecting the plug to a single conductor shielded cable.
10.CHANNELS3 and4,IN- OUT
BRIDGED:Connecta cablefroma PreamplifierorControlCenterto3 IN.
STEREO:Connectcablesfromthestereooutputsofa Preamplifier,ControlCenterorother
accessorycomponentto3 INand4 IN.
MONO:Connectcablesfromthestereooutputsofa PreamplifierorControlCenterto3
INand4 IN.ThestereosignalswillbecombinedtoMonoandfedtoeachamplifierchannel.
ThetwoLEVELcontrolswillworkseparatelyoneachchannel.
The OUTjacks provide a convenient connection to feed the same signals to other chan-
nels on the MC7108, or to any accessory component.
11.LEVEL(BRIDGED,STEREOandMONO)
BRIDGED:Useonlythe3 BRIDGEDLEVELcontrolandadjustasdesired.
STEREO:Adjusttheindividual3 and4 LEVELcontrolsasdesired.The2.5Vsettingissug-
gestedwhentheMC7108isbeingusedwitha MclntoshPreamplifierorControlCenter.
MONO:Adjusttheindividual3 and4 LEVELcontrolsasdesired.Thecombined3 and4
Monosignalswillbereproducedbyeachchannel.
12.MODE(BRIDGED,STEREOandMONO)
SettheMODEswitchtothepositionforthedesiredoperatingconfiguration.
13.CHANNELS1 and2,IN- OUT
BRIDGED:Connecta cablefroma PreamplifierorControlCenterto1 IN.
STEREO:Connectcablesfromthestereooutputsofa Preamplifier,ControlCenterorother
accessorycomponentto1 INand2 IN.
MONO:Connectcablesfromthestereooutputsofa PreamplifierorControlCenterto1
INand2 IN.ThestereosignalswillbecombinedtoMonoandfedtoeachamplifierchannel.
ThetwoLEVELcontrolswillworkseparatelyoneachchannel.
The OUTjacks provide a convenient connection to feed the same signals to other chan-
nels on the MC7108, or to any accessory component,
14.LEVEL(BRIDGED,STEREOandMONO)
BRIDGED:Useonlythe1 BRIDGEDLEVELcontrolandadjustasdesired.
STEREO:Adjusttheindividual1 and2 LEVELcontrolsasdesired.The2.5Vsettingissug-
gestedwhentheMC7108isbeingusedwitha MclntoshPreamplifierorControlCenter.
MONO:Adjusttheindividual1 and2 LEVELcontrolsasdesired.Thecombined1 and2
Monosignalswillbereproducedbyeachchannel.
15.MODE(BRIDGED,STEREOandMONO)
SettheMODEswitchtothepositionforthedesiredoperatingconfiguration.
8

16.ACPOWERCORD
ConnecttheMC7108toa live50/60HZ,120voltACwalloutletora PowerControlRelay.
DonotconnecttheunittoanACoutletontherearpanelofa PreamplifierorControlCenter.
TheACpowercanalsobeturnedonandoffbysendinga signaltothePOWERCONTROL
INjack.(Referto"1",POWERand"9",POWERCONTROL,IN-OUT)
17.8A250V(Fuse)
CAUTION:Forcontinuedprotectionagainstfirehazard,replaceonlywiththesametype
8A-250VSLOBLOfuse.
All MC7108 outputs are in phase with the inputs.
18.CHANNEL7 and8 OUTPUTS
StereoandMono:ConnectcablesfromeachloudspeakerCommonterminaltotheMinus
(-)orCommonterminalsforchannels7 and8.Connectcablesfromeachloudspeakerpositive
terminaltothePositive( +) terminalsforchannels7 and8.Besuretoobservethepolarity
markingsandconnectbothchannelsinanidenticalmanner.Mostloudspeakersusuallyhave
theirCommonorMinusterminalscolorcodedBlackandthePositiveorHotterminalscoded
Red.
BridgedPair:Connecta cablefromtheCommonloudspeakerterminaltotheMINUS(-)
BRIDGEDterminal,(Channel8 +).Connecta cablefromthePositiveloudspeakerterminal
tothePositive( +) BRIDGEDterminal,(Channel7 +).
19.CHANNEL5 AND6 OUTPUTS
StereoandMono:ConnectcablesfromeachloudspeakerCommonterminaltotheMinus
(-)orCommonterminalsforchannels5 and6.Connectcablesfromeachloudspeakerpositive
terminaltothePositive( + } terminalsforchannels5 and6.Besuretoobservethepolarity
markingsandconnectbothchannelsinanidenticalmanner.Mostloudspeakersusuallyhave
theirCommonorMinusterminalscolorcodedBlackandthePositiveorHotterminalscoded
Red.
BridgedPair:Connecta cablefromtheCommonloudspeakerterminaltotheMINUS(-)
BRIDGEDterminal,(Channel6 +).Connecta cablefromthePositiveloudspeakerterminal
tothePositive( +) BRIDGEDterminal,(Channel5 +).
20.MULTIROOMCONTROL
ConnectanoptionalcablewithDINconnectorsoneachend,(MclntoshPartNo.170-147)
fromtheMULTIROOMCONTROLCONNECTORTOA MclntoshCR10system,Thecontrol
cableallowstheCR10toswitchONtheMC7108speakerrelays,onlyfortheremoteareas
thatareactive.
21.CHANNEL3 AND4 OUTPUTS
StereoandMono:ConnectcablesfromeachloudspeakerCommonterminaltotheMinus
(-)orCommonterminalsforchannels3 and4.Connectcablesfromeachloudspeakerpositive
terminaltothePositive(+) terminalsforchannels3 and4.Besuretoobservethepolairty
markingsandconnectbothchannelsinanidenticalmanner.Mostloudspeakersusuallyhave
theirCommonorMinusterminalscolorcodedBlackandthePositiveorHotterminalscoded
Red.
BridgedPair.Connecta cablefromtheCommonLoudspeakerterminaltotheMINUS(-
BRIDGEDterminal,(Channel4 +).Connecta cablefromthePositiveloudspeakerterminal
tothePositive( + ) BRIDGEDterminal,(Channel3 + ).
REARPANEL
ANDHOW
TOMAKE
CONNECTIONS
9

REARPANEL
ANDHOW
TOMAKE
CONNECTIONS
22.CHANNEL1 AND2 OUTPUTS
StereoandMono:ConnectcablesfromeachloudspeakerCommonterminaltotheMinus
(-)orCommonterminalsforchannels1 and2.Connectcablesfromeachloudspeakerpositive
terminaltothePositive( + ) terminalsforchannels1 and2.Besuretoobservethepolarity
markingsandconnectbothchannelsinanidenticalmanner.Mostloudspeakersusuallyhave
theirCommonorMinusterminalscolorcodedBlackandthePositiveorHotterminalscoded
Red.
BridgedPair:Connecta cablefromtheCommonloudspeakerterminaltotheMINUS(-)
BRIDGEDterminal,(Channel2 +).Connecta cablefromthepositiveloudspeakerterminal
tothePositive( +) BRIDGEDterminal,(Channel1 +).
CUSTOM
INSTALLATION
DIAGRAMS
10

EIGHT40WATT
CHANNELS
(4PAIRS)
11

SIX40WATT
CHANNELSAND
ONE100WATT
BRIDGEDPAIR
CHANNEL
12

FOUR40WATT
CHANNELSAND
TWO100WATT
BRIDGEDPAIR
CHANNELS
13

TWO40WATT
CHANNELSAND
THREE100WATT
BRIDGEDPAIR
CHANNELS
14

FOUR100WATT
BRIDGEDPAIR
CHANNELS
15

16
McINTOSH
HOMETHEATER
SYSTEM#1
HT-3Right
Surround
5CHANNELOPERATINGCONFIGURATION
WITHMX118A/VTUNERCONTROLCENTER
HT-3Left
Surround

17
8CHANNELOPERATING
CONFIGURATIONWITHC39or
MX130A/VCONTROLCENTER
INCLUDINGREMOTEAREA"B".
MCINTOSH
HOMETHEATER
SYSTEM#2

SPECIFICATIONS
POWEROUTPUT,EIGHTCHANNELS
40wattsperchannel,minimumsinewave
continuousaveragepoweroutputperchan-
nel,allchannelsoperatinginto4 ohmloads.
TheoutputRMSvoltageis:
12.6Vacross4 ohms
POWEROUTPUT,TWOCHANNELS
BRIDGED
100wattsintoa 4 ohmload,minimum
sinewavecontinuousaveragepoweroutput.
TheoutputRMSvoltageis:
20Vacross4 ohms
OUTPUTLOADIMPEDANCE
8or4 ohms,foralleightseparate
channels
8or4 ohms,forallBridgedPairs
RATEDPOWERBAND
20H2to20,000Hz
TOTALHARMONICDISTORTION
0.005%maximumharmonicdistortionat
anypowerlevelfrom250mWtoratedpower
perchannelfrom20Hzto20,000Hz,all
channelsoperating.
IHFDYNAMICHEADROOM
1.8dB
FREQUENCYRESPONSE
+0,-0.25dBfrom20Hzto20,000Hz
+0,-3.0dBfrom10Hzto100,000Hz
INPUTSENSITIVITY
1V,(2.5VwithLevelcontrolatcenter
detent)
AWEIGHTEDSIGNALTONOISERATIO
92dB(112dBbelowratedoutput)
INTERMODULATIONDISTORTION,
SMPTE
0.005%maximumifinstantaneouspeak
powerdoesnotexceedtwicetheoutput
powerratingperchannel,withallchannels
operating,foranycombinationoffrequen-
ciesfrom20Hzto20,000Hz.
WIDEBANDDAMPINGFACTOR
200at8 ohms
100at4 ohms
INPUTIMPEDANCE
20,000ohms
POWERGUARD
ClippingispreventedandTHDdoesnot
exceed2%withupto14dBoverdriveat
1000Hz.
POWERREQUIREMENTS
120V,50/60Hz,8AUL/CSA
SIZE
Frontpanel:17-1/2inches(44.5cm)W,
7-1/16inches(17.9cm)H,20inches(50.8cm)
Dbehindmountingpanel,including
clearanceforconnectors.Panelclearance
requiredinfrontofmountingpanelis3/4
inch(1.9cm).
FINISH
Frontpanelisglasswithgoldtea!
nomenclatureillumination.Chassisand
chassiscoverareblack.
WEIGHT
40pounds(18.1Kg)net,58pounds
(28.3Kg)inshippingcarton.
16