Dual XPA4640 User Manual download pdf (Page 8)

XPA SERIES OPERATION

Configuration/Setup

Theinputlevelcontrol(gain)isusedtoobtainthebest

possiblematchbetweentheheadunitaudiooutputand

theamplifierinput.Beginbyturningtheinputlevelcontrol

fullycounterclockwise.Next,turnuptheheadunitvolume

controlaround3/4ofthewayup.Adjusttheinputlevel

controlclockwiseuntilaudibledistortionisheard,then

slightlycounterclockwisetoprovidethebestmatch.

Repeatforallinputlevelcontrols.

Select2 CHmodeiftheheadunitonlyhas1pairofRCA

outputs.PlugtheRCA’sfromtheheadunitintochannels

1/2or3/4.All4amplifierinputswillreceiveasignal.

NOTE:Thereisnofaderfunctionwhenusing2 CH mode.

Select4 CHmodeiftheheadunithas2pairsofRCA

outputs.PlugtheRCA’sfromtheheadunitintochannels

1/2and3/4.

Thecrossoverisusedtofilteroutfrequenciesaboveor

belowacertainpoint.ChooseLPFwhenusingtheamplifier

withsubwoofers,HPFwhenusingwithmidrange/tweeter

combinations and FULLwhenusingwithcoaxial-type

speakers.

NOTE Choose FULLwhenusingtheamplifierinstereo/

bridgedsimultaneousmode.Inthismode,passive

crossoversarerequired.Failuretousethecorrectpassive

componentsmaydamagetheamplifierand/orspeakers.

Consultaqualifiedprofessionalforrecommendations.

Thiscontrolallowspreciseadjustmentofthecrossover

frequency.

Thiscontrolprovidesadditionalboost@45Hzwhenused

withsubwoofers.Adjustthiscontrolwithcaution-as

improperusecandamagespeakers!

TheLEDindicatorilluminatesgreenduringnormal

operation(POWER)andredwhentheamplifierdetectsa

fault(PROTECT).

Input level Control

Input Mode Switch

(XPA4640)

Crossover Mode

(XPA2500 & XPA4640)

Crossover Frequency Control

Bass Boost

LED Indicator

1 2 3 4 5 6 7 8 9 10 11 12

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Dual XPA4640 User Manual Page 8

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