JBL GT-X646 Owner's Manual - page 3
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E
ng
lis
h
a
speaker output ConneCtors
•Connectthespeakerstotheseterminals,observingproperpolarity.
•Four-channeloperation:Connectthefrontleftspeakertothe
FrontL+andL–terminals,andthefrontrightspeakertothe
FrontR+andR–terminals.Repeatforrearspeakers,usingthe
RearL+andL–terminalsandtheRearR+andR–terminals.
•Three-channeloperation:Connectthestereospeakerstothe
Frontterminals,asabove.Connectthesinglespeakerinto
whichtheamplifier’srearchannelswillbebridgedtotheRear
R+andRearL–terminals.
•Two-channel(bridged)operation:Connectonespeakertothe
FrontR+andFrontL–terminals.Connecttheotherspeakerto
theRearR+andRearL–terminals.
•Minimumspeakerimpedanceforstereooperationis2ohms.
Minimumspeakerimpedanceforbridgedoperationis4ohms.
b
Fuses
•Replaceonlywiththesametypeandrating.
c
poWer Input ConneCtors
•+12V:Connecttothepositiveterminalofthevehicle’sbattery.
8AWGwireisrecommended.Installanappropriatefuseholder
andfuse(40Aminimum)within18"(460mm)ofthebattery.Make
surethewireisnotdamagedorpinchedduringinstallation.
Installprotectivegrommetswhenroutingwiresthroughthe
firewallorothersheetmetal.
•GND:Connecttothevehicle’schassis.Refertothepicturebelow.
Factory Bolt
Ring Connector
Ground Wire
Note: Remove any paint
below ring connector.
Star Washer
•REM:Connecttothe“RemoteOut”leadfromthesourceunitor
toasourceofswitched12V+(ACC).
d
aux output ConneCtors (rCa)
•Summed,nonfilteredpass-throughoutput.Frontrightandrear
rightinputsarecombinedandsenttotherightAUXoutput.Front
leftandrearleftinputsarecombinedandsenttotheleftAUX
output.Connecttotheinputofanadditionalsubwooferamplifier.
e
Front Input ConneCtors (rCa)
•ConnecttothefrontRCAoutputsfromthesourceunitorsignal
processor.
f
Front Input-level Control
•Usedtomatchthefrontinputleveloftheamplifiertotheoutput
levelofthesourceunit.
•Seep fortheadjustmentprocedure.
g
Front Crossover-FrequenCy Control
•12dB/octavecrossover,variablefrom32Hzto320Hz.
•Seeq fortheadjustmentprocedure.
h
Front Crossover-FIlter seleCtor
•LP(SUB):Selectforsubwoofer(s).
•FLAT:Selectforfull-rangespeakerswhennosubwooferwillbe
usedinthesystem.
•HP:Selectformidrangespeakersorfull-rangespeakerswhena
subwooferisusedinthesystem.
i
poWer on led
•Illuminatedwhentheamplifierison.
j
proteCt led
•Illuminatedunderanyofthefollowingfaultconditions:battery
over/undervoltage,shortcircuitinspeakerwires,amplifieristoo
hot,amplifier’soutputcircuithasfailed(DCvoltagepresentin
theamplifier’soutput).
k
rear Bass-Boost Control
•Providesupto6dBofboostat50Hz.SettheBass-Boostcontrol
accordingtoyourpreference,beingcarefulnottoapplyenough
boosttodamagethespeaker(s).
l
rear Crossover-FrequenCy Control
•12dB/octavecrossover,variablefrom32Hzto320Hz.
•Seeadjustmentprocedureinq.
m
rear Crossover-FIlter seleCtor
•LP(SUB):Selectforsubwoofer(s).
•FLAT:Selectforfull-rangespeakerswhennosubwooferwillbe
usedinthesystem.
•HP:Selectformidrangespeakersorfull-rangespeakerswhena
subwooferisusedinthesystem.
n
rear Input-level Control
•Usedtomatchtherearinputleveloftheamplifiertotheoutput
levelofthesourceunit.
•Seep fortheadjustmentprocedure.
o
rear Input ConneCtors (rCa)
•ConnecttorearRCAoutputsfromthesourceunitorsignal
processor.
p
settIng the Input level
a
TurnInput-Levelcontrolcounterclockwiseto6V(minimum).
b
Withadynamicmusictrackplaying,turntheheadunit’s
volumecontroltothe3/4position.
c
TurnFrontInput-Levelcontrolclockwiseuntilthemusicisso
loudthatitnolongersoundsclear(distortionispresentinthe
output).
d
TurnFrontInput-Levelcontrolcounterclockwisegradually,just
untilthemusicsoundsclearonceagain.
e
Front-levelinputisnowadjustedcorrectly.
f
AdjustRearInput-Levelcontrolsothattheleveloftherear
speakersisproportionatetothelevelofthefrontspeakers,
accordingtoyourpreference.
q
settIng the Crossover
a
Crossoversettingfor5"(127mm)orlargerfull-rangespeakers
whennosubwooferisincludedinthesystem.
b
Crossoversettingformidrangeand/orfull-rangespeakers
whenasubwooferisincludedinthesystem.
c
Crossoversettingforsubwoofers.
note:Acceptablefrequencyrangesareindicatedingray.
Thisproductisdesignedformobileapplicationsandisnotintendedfor
connectiontothemains.
Avalidserialnumberisrequiredforwarrantycoverage.
GT-X646 Car auDIO POwer aMPlIFIer Owner’s Manual