JBL GX-A604 User manual
GX-A604/GX-A602/GX-A3001
power amplier
OWNER'S MANUAL
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INTRODUCTION
THANK YOU for purchasing a JBL®GX-series amplifier. So we can better serve you should you require warranty service, please retain your original
sales receipt and register your amplifier online at www.jbl.com.
INCLUDED ITEMS
GX-Series Amplifier (x 1)
Speaker-level input harness
(GX-A602, GX-A3001 x 1)
(GX-A604 x 2)
LOCATION AND MOUNTING
Although these instructions explain how to install GX-series amplifiers in a general sense, they do not show specific installation methods that may be
required for your particular vehicle. If you do not have the necessary tools or experience, do not attempt the installation yourself. Instead, please ask
your authorized JBL car audio dealer about professional installation.
INSTALLATION WARNINGS AND TIPS
IMPORTANT: Disconnect the vehicle’s negative (–) battery terminal before beginning the installation.
• Always wear protective eyewear when using tools.
• Check clearances on both sides of a planned mounting surface. Be sure that screws or wires will not puncture brake lines, fuel lines or wiring
harnesses, and that wire routing will not interfere with the safe operation of the vehicle.
• When making electrical connections, make sure they are secure and properly insulated.
• If you must replace any of the amplifier's fuses, be sure to use the same type of fuse and current rating as that of the original.
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INSTALLATION LOCATION
Amplifiers need air circulation to stay cool. Select a location that provides enough air for the amp to cool itself.
• Suitable locations are under a seat (provided the amplifier doesn’t interfere with the seat adjustment mechanism), in the trunk, or in any other
location that provides enough cooling air.
• Do not mount the amplifier with the heatsink facing downward, as this interferes with the amplifier’s convection cooling.
• Mount the amplifier so that it will not be damaged by the feet of backseat passengers or shifting cargo in the trunk.
• Mount the amplifier so that it remains dry – never mount an amplifier outside the car or in the engine compartment.
MOUNTING THE AMPLIFIER
NOTE : You may find it more convenient to make all of the connections to the amplifier before you permanently mount it to the vehicle.
1. Select a suitable mounting location as described above.
2. Using the amplifier as a template, mark the locations of the mounting holes on the mounting surface.
3. Drill pilot holes in the mounting surface.
4. Attach the amplifier to the mounting surface with four appropriate mounting screws of your own choice. We suggest using #8 Phillips-head sheet
metal screws. Make sure the amplifier is mounted securely.
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POWER AND GROUND CONNECTIONS
IMPORTANT: Disconnect the vehicle's negative (–) battery terminal before beginning the installation.
The GX series amplifiers are capable of delivering high power levels, and require a heavy-duty and reliable connection to the vehicle’s electrical
system to achieve optimal performance. Please adhere to the following instructions carefully.
USING THE CONNECTORS
GX-series amplifiers use the same type of screw terminals for power and speaker connections. This type of terminal is easy to use and allows the
easy connection of large-gauge wire.
To use the connectors, use a Phillips screwdriver to loosen the connector’s set screw, insert the bare wire and tighten the set screw to secure the
wire in the connector, as shown in the illustration below.
Tighten
Screw
Loosen
Screw
Insert Wire
Under Washer
IMPORTANT: Make sure the (+) and (–) speaker bare wires do not touch each other or the other terminal at both the amplifier terminals and speaker
terminals. Touching wires can cause a short circuit that can damage the amplifier.
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GROUND (GND) CONNECTION
Connect a wire (minimum 10AWG – 5.3mm2)
from the amplifier’s GND terminal directly to a
solid point on the vehicle’s chassis.
• For a good connection, use sandpaper to
clear the paint from the metal surface at this
chassis location. Use a star-type lock washer
to secure the wire’s connection.
POWER (12V) CONNECTION
1. Connect a wire (minimum 10AWG –
5.3mm2) directly to the battery’s positive (+)
terminal.
2. Install a fuse holder for a 50A fuse (GX-
A604, GX-A3001) or a 30A fuse (GX-A602)
on this wire within 18" (46cm) of the
battery’s (+) terminal. Do not install the fuse
in the holder at this time.
3. Route this wire to the amplifier’s location
and connect it to the amplifier’s +12V
terminal. 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. When you are finished routing and
connecting this wire, install the appropriate
fuse in the holder you installed near the
battery. (GX-A604, GX-A3001 – 50A fuse;
GX-A602 – 30A fuse)
Power
Connectors
Audio System
Head Unit
Chassis Ground
(bare metal)
50A Fuse (GX-A604/GX-A3001)
30A Fuse (GX-A602) 18" (46cm)
Remote Turn-On
(optional)
>#18AWG (0.82mm2) Wire
>#10AWG (5.26mm2) Wire
>#10AWG (5.26mm2) Wire
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SPEAKER AND INPUT CONNECTIONS
Always connect the (+) speaker terminal on the amplier to the (+) terminal on the speaker and the (–) speaker terminal on the amplier to the (–) terminal
on the speaker.
IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier terminals and speaker
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)
• Connect the front speakers to the FL and FR (+) and (–) terminals.
• Connect the rear speakers to the RL and RR (+) and (–) terminals.
Speaker Fuses 20A
Front Left Speaker Front Right Speaker
Rear Left Speaker Rear Right Speaker
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GX-A604 INPUT CONNECTIONS: 4-CHANNEL OPERATION
Connect your source unit or processor's front and rear left and right outputs to the amplifier's inputs as shown in the illustration.
Source Unit
Front Line Outputs
Rear Line Outputs
See Set The Crossover Controls, on page 11, for information about setting the amplifier's controls for 4-channel operation.
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)
• Connect the left and right speakers to the FL and FR (+) and (–) terminals
• Connect the subwoofer to the RL (+) and RR (–) terminals. (The rear-channel Bass Boost control makes the rear channels preferable for subwoofer
connection. See Set The Bass Boost, on page 12.) 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
Connect your source unit or processor's line outputs as shown in the illustration below. Set the input mode switch in the "4CH" position
NOTE: Use a "Y"-adapter to connect the source unit's subwoofer output to the amplifier's rear left and right input jacks.
Source Unit
Front Line Outputs
"Y"-Adapter
Subwoofer Line Output
See Set The Crossover Controls, on page 11, for information about setting the amplifier's controls for 3-channel operation.
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)
Connect the left and right speakers as shown in the illustration below.
Speaker Fuses 20A
Left Speaker Right Speaker
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