Wisdom AUDIO SYSTEM CONTROLLER SC-1 - Using Single-Ended Preamplifiers; Using Single-Ended Amplifiers

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Duringcalibration,theLeftinput(inthetopleftcornerasseenfrom
behindtheunit)isalsousedbyyourinstallerforconnectingtheoutputof
thecalibratedmicrophonethatmeasurestheroom’sresponse.
 Caution! DonotconnectthecalibratedmicrophonetotheLeftinputinput
oftheSC-1untilinstructedtodosoapartoftheMultEQ®Pro
softwareapplication.
DoingsobeforecompletingtheProductSelectionscreenaspart
oftheMultEQProapplication(seeProduct Selection,page31)
willcausemicrophonefeedbackatlevelsthatcoulddamagethe
speakers.
Using single-ended preampliers Ifyourpreamplier/processordoesnothavebalancedoutputs,theadapter
usedtoconvertfrombalancedtosingle-endedshouldtiePin1andPin3
(theinvertedsignal)together.Thiscaneasilybecheckedwithanohmme-
ter:theimpedancebetweenPin1andPin3shouldapproachzero.Note
that the most suitable adapter on the input side of the SC-1 is different
than the appropriate adapter on the output side, due to the SC-1’s high
input impedance.Shouldyouneedthem,properlywiredadaptersare
availablefromWisdomAudioforanominalcharge.
2 7 Channel High (Planar) Output
Thesesevenbalancedaudiooutputscarrytheroom-corrected“highpass”
portionoftheaudiospectrum,andmustbeconnectedtotheampliers
thatdrivetheplanarmagneticpanels.
ThepinassignmentsofthisXLR-typemaleoutputconnectorare:
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 Pin1:Chassisground
 Pin2:Signal+(non-inverting)
 Pin3:Signal–(inverting)
 Connectorgroundlug:chassisground
Thesepinassignmentsareconsistentwiththestandardsadoptedbythe
AudioEngineeringSociety.Refertotheoperatingmanualofyourpower
ampliertoverifythatthepinassignmentsofitsinputconnectorscor-
respondtoyourWisdomAudioSC-1.Ifnot,wirethecablessothatthe
appropriateoutputpinconnectstotheequivalentinputpin,inorderto
preservethepolarityofthemusicalsignal.
Using single-ended ampliers Ifyourpoweramplierdoesnothavebalancedinputs,theadapterused
toconvertfrombalancedtosingle-endedmust“oat”Pin3(theinverted
signal).Thiscaneasilybecheckedwithanohmmeter:theimpedancebe-
tweenPin3andeitherthecenterpinortheshieldskirtontheRCAshould
beinnite.TyingtheoutputofPin3toground(asmanyadaptersdo)will
compromisetheperformanceoftheSC-1,duetoitslowoutputimped-
ance.Note that the most suitable adapter on the input side of the SC-1 is
different than the appropriate adapter on the output side, due to the SC-1’s
low output impedance.Shouldyouneedthem,properlywiredadapters
areavailablefromWisdomAudioforanominalcharge,ortheycanbe
purchasedonlineat