HowtoConnect
INPUT
STEREOORTWINAMPLIFIEROPERATION
Useshieldedcablestoconnectthesignalfrom
thepreamplifierorsignalsourcetothepower
amplifierinput.Tominimizethepossibilityofhum
theshieldedcablesshouldberunparalleltoeach
otherorlooselytwistedtogether.Locatethecables
awayfromspeakerleadsandACpowercords.All
connectionsaremadeonthebackpaneloftheMC
502.
Forstereooperation,theleftoutputofthe
preamplifiershouldbepluggedintotheLeftinput
jackofthepoweramplifier.Therightoutputofthe
preamplifiershouldbepluggedintotheRight
(MONO)inputjackofthepoweramplifier.
MONOPHONICORSINGLECHANNELOPERATION
Ashieldedcablefromthesignalsourceisplug-
gedintotheRight(MONO)inputjackoftheMC502
only.TheMODESWITCHonthebackpanelofthe
amplifiermustbeplacedintheMONOposition.In
theMONOpositiontherightchannelinputjackcon-
nectstobothamplifiers.TheLeftINPUTisdiscon-
nected.
OUTPUT
Selectionofthepropergaugewiretoconnectthe
loudspeakerspreservesthequalityofsoundrepro-
ductionforwhichtheloudspeakershavebeende-
signed.Ifundersizewireisused,resistanceisadded
totheamplifier/loudspeakercombinationwhich
adverselyaffectstheperformance.Addedresis-
tancecausesreductionofdampingcharacteristics,
modificationoffrequencyresponseandreductionin
poweroutput.
Uselampcord,bellwire,orwirewithsimilartype
ofinsulationtoconnectthespeakerstotheampli-
fier.Inallcases,theleadstoandfromthespeaker
shouldbetwinconductorortwistedtogether.When
using8 ohmspeakersandforthenormallyshortdis-
tancesofunder30feetbetweentheamplifierand
speaker,No.18wireorlargercanbeused.For
distancesover30feetbetweentheamplifierand
speakeruselargerdiameterwire.Selectthecorrect
sizewireforthewirelengthfromthechart.Itis
recommendedthattheDCresistanceofthespeaker
leadsbelessthan5%ofthespeakerimpedance.Up
to10%canbetolerated.Resistanceoftheleads
shouldbecomputedforthelengthofwirebothto
andfromthespeakerorspeakers.
Wire
Gauge
22
20
18
16
14
12
10
MAXIMUMWIRELENGTHS
For4 OhmLoad
Feet
6
10
15
25
40
60
100
Meters
1.8
3.1
4.6
7.6
12.2
18.3
30.5
For8 OhmLoad
Feet
12
20
30
50
80
120
200
Meters
3.7
6.1
9.1
15.2
24.4
36.6
66.0
Wirelengthsaboverepresentthewireresistanceequalto5%
ofthespeakerimpedance.
Formultiplespeakeroperation,runseparate
leadsfromtheamplifiertothespeakers.
CONNECTINGLOUDSPEAKERSFORSTEREO
Connecttheleadsfromtheleftloudspeakertothe
LeftandCommonOUTPUTterminalsontheMC502.
Connecttheleadsfromtherightmainloudspeaker
totheRightandCommonterminals.
CONNECTINGONELOUDSPEAKERFORMONO
ConnectleadsfromtheloudspeakertotheLeft
andRightOUTPUTterminalsontheMC502.Check
tobesuretheMODEswitchisintheMONOposi-
tion.
InMONOoperationneitheroutputterminal(Left
orRight)isatgroundpotential.Theoutputisbalanc-
edtoground.Dueprecautionisrequiredwhencon-
nectingtestinstrumentssinceneitherterminalcan
begrounded.
ACPOWER
TheamplifierACpowercordispluggedintoa 120
volt50/60Hzwalloutlet.
FUSE
A4-ampfuseprotectstheMC502circuits.The
fusedoesnotprotectadditionalequipmentcon-
nectedtotherearpanelACpoweroutlets.
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