JBL GX-A604 User manual
Service Manual
GX-A604
435-Watt full range 4-channel car power amplifier
Released EU2015 Harman Consumer Group, Inc. Rev 0, 00/20XX
8500 Balboa Boulevard
Northridge, California 91329
OWNER’S MANUAL 2
TROUBLESHOOTING 9
TECHNICAL SPECIFICATIONS 11
PACKING LIST 12
BLOCK DIAGRAM 13
SCHEMATIC DIAGRAMS 14
CONTENTS
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ground (gnd) connectIon
Connectawire(minimum10AWG–5.3mm2)
from the amplifier’s GND terminal directly to a
solid point on the vehicle’s chassis.
• Foragoodconnection,usesandpapertoclear
the paint from the metal surface at this chassis
location. Use a star-type lock washer to secure
the wire’s connection.
poWer (12 V) connectIon
1. Connectawire(minimum10AWG–5.3mm2)
directlytothebattery’spositive(+)terminal.
2. Installafuseholderfora50Afuse(GX-A604,
GX-A3001)ora30Afuse(GX-A602)onthis
wirewithin18"(46cm)ofthebattery’s(+)
terminal. Do not install the fuse in the holder
at this time.
3. Route this wire to the amplifier’s location and
connectittotheamplifier’s+12Vterminal.
Be sure to use appropriate grommets
whenever routing wires through the firewall
or other sheet metal. IMPORTANT: Failure
to adequately protect the positive wire from
potential damage may result in a vehicle fire.
4. Whenyouarefinishedroutingandconnecting
this wire, install the appropriate fuse in the
holder you installed near the battery.
(GX-A604,GX-A3001–50Afuse;
GX-A602–30Afuse)
Power
Connectors
Audio System
Head Unit
Chassis Ground
(bare metal)
50 A Fuse (GX-A604/GX-A3001)
30 A Fuse (GX-A602) 18" (46 cm)
Remote Turn-On
(optional)
>#18 AWG (0.82 mm2) Wire
>#10 AWG (5.26 mm2) Wire
>#10 AWG (5.26 mm2) Wire
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speAker And input connections
Alwaysconnectthe(+)speakerterminalontheampliertothe(+)terminalonthespeakerandthe(–)speakerterminalontheampliertothe(–)terminal
on the speaker.
IMPORTANT:Makesurethe(+)and(–)barewiresdonottoucheachotherortheotherterminalatboththeamplifierterminalsandspeaker
terminals. Touching wires can cause a short circuit that can damage the amplifier.
gX-a604 speaker connectIons: 4-channel operatIon
Minimum speaker impedance: 2 ohms (each)
• ConnectthefrontspeakerstotheFLandFR(+)and(–)terminals.
• ConnecttherearspeakerstotheRLandRR(+)and(–)terminals.
Speaker Fuses 20A
Front Left Speaker
Rear Left Speaker
Front Right Speaker
Rear Right Speaker
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gX-a604 Input connectIons: 4-channel operatIon
Connectyoursourceunitorprocessor’sfrontandrearleftandrightoutputstotheamplifier’sinputsasshownintheillustration.
Source Unit
Front Line Outputs
Rear Line Outputs
See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor4-channeloperation.
To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.
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gX-a604 speaker connectIons: 3-channel operatIon
Minimum speaker impedance: 2 ohms each (left & right speakers); 4 ohms (subwoofer)
•ConnecttheleftandrightspeakerstotheFLandFR(+)and(–)terminals
•ConnectthesubwoofertotheRL(+)andRR(–)terminals.(Therear-channelBassBoostcontrolmakestherearchannelspreferableforsubwoofer
connection. See Set The Bass Boost, on page 23.) NOTE: You can connect two 2-ohm subwoofers in series to maintain the required 4-ohm
mimimum impedance for the subwoofer channel.
Speaker Fuses 20A
Front Left Speaker Front Right Speaker
Subwoofer
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gX-a604 Input connectIons: 3-channel operatIon
Connectyoursourceunitorprocessor’slineoutputsasshownintheillustrationbelow.Settheinputmodeswitchinthe"4CH"position
NOTE: Usea"Y"-adaptertoconnectthesourceunit’ssubwooferoutputtotheamplifier’srearleftandrightinputjacks.
Source Unit
Front Line Outputs
"Y"-Adapter
Subwoofer Line Output
See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor3-channeloperation.
To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.
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gX-a604 speaker connectIons: 2-channel operatIon
Minimum speaker impedance: 4 ohms (each)
Connecttheleftandrightspeakersasshownintheillustrationbelow.
Speaker Fuses 20A
Left Speaker Right Speaker
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gX-a604 Input connectIons: 2-channel operatIon
Connectyoursourceunitorprocessor’slineoutputsasshownintheillustrationbelow.Useonlythefrontleftandrightinputconnectionsandmake
surethattheInputModeswitchissetinthe"2CH"position.
Source Unit
Front Line Outputs
See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor2-channeloperation.
To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.
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troubleshootinG
If your amplifier isn’t performing the way you think is should, check to see if the problem is covered in this section before calling your dealer or
contacting JBL customer service.
PROBLEM CAUSES AND SOLUTIONS
Nosound(theamplifier’sPowerLEDisoff) • Checkthattheamplifier’s+12VandGNDconnectionshavebeenproperlymade.
• Checkifthefuseonthe+12Vwirelocatednearthebatteryisblown:Ifso,replaceitwithan
identical fuse.
• Checkallamplifierfuses;ifanyareblown,replacethemwithidenticalfuses.
• Ifyouareusingtheamplifier’sREMconnectionforturn-on,checkthatthewireisproperly
connectedtotheaudiosystem’sremoteturn-onwireortothevehicle’sACCpowerterminal.
Nosound(theamplifier’sPowerLEDisorange) •Checkthatallamplifierinputandspeakerconnectionshavebeenproperlymade.
• Checkthattheamplifier’sLevelcontrolsarenotturnedallthewaydown(counter-clockwise).
• Checkthatthevehicleaudiosystem’ssourceunit’svolumecontrolisnotturnedalltheway
down.
Nosound(theamplifier’sProtectionLEDisred) •Confirmthatthevehicle’selectricalsystemissupplyingbetween9Vand16VDCtothe
amplifier. If the supply voltage is outside of this range, correct the condition before attempting to
use the amplifier.
• Iftheamplifierhasoverheated,waituntilithascooleddownbeforeattemptingtouseitagain.
• Disconnectallspeakersfromtheamplifierandattempttoturnitonagain:
– Iftheamplifierturnson(thePowerLEDisorange),thereisashortcircuitinoneormoreofthe
speakerwires.Correctallshortcircuitsbeforereconnectingthespeakerstotheamplifier.
– Iftheamplifierdoesnotturnon(theProtectionLEDisstillredandthePowerLEDisoff),
contact your authorized JBL dealer for assistance.
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PROBLEM CAUSES AND SOLUTIONS
Sound only comes from some of the speakers
connected to the amplifier
• Checkthatthevehicleaudiosystem’ssourceunit’sbalanceandfadercontrolsaresettotheir
center (midpoint) positions.
• (GX-A604):Checkthatthesettingoftheamplifier’sModeSwitchmatchestheinputandspeaker
connections made to the amplifier
Sound is too quiet, even with the vehicle audio
system’s source unit volume all the way up
• Checkthattheamplifier’sLevelcontrolsarenotturnedtoolow.SeeSet The Input Level, on
page 22, for information about setting the Level controls.
Sound in the front/rear speakers is distorted • Makesuretheamplifier’sCrossoverFilterswitchforthedistortedchannelsissettoHP.
• SettheCrossovercontrolforthedistortedchannelstoahighersetting.
• Checkthatthedistortionisnotoriginatingfromthevehicleaudiosystem’ssourceunit.
Sound in the subwoofer is distorted • (GX-A604,GX-A602):SettheBassBoostswitchto"OFF".
• (GX-A3001):Whilelisteningtobass-heavymusic,turntheBassBoostcontrolallthewaydown,
and then gradually increase it until the distortion begins to return. Reduce the Bass Boost
control setting slightly to eliminate the distortion and leave it set there.
• Checkthatthedistortionisnotoriginatingfromthevehicleaudiosystem’ssourceunit.
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