Dual XPA4640 Stereo Amplifier User Manual


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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
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