Harman JBL GX-A422SI Manuel utilisateur

Service Manual

GX-A422SI

Power Amplifier

Released Global Quality 2015 Harman Consumer Group, Inc. Rev 1.0, 03/2015

8500 Balboa Boulevard

Northridge, California 91329

OWNER’S MANUAL 2

SCHEMATICS DIAGRAMS 18

LAYOUT DIAGRAMS 22

SET BLOCK DIAGRAM 16 PACKAGING INSTRUCTIONS 27

CONTENTS

SET WIRING DIAGRAM 17 MECHANICAL EXPLODED VIEW 26

GX-A422SI

power ampliﬁer

OWNER'S MANUAL

INTRODUCTION

THANK YOU for purchasing a JBL®GX-A422SI 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-A422SI Amplifier (x 1) Speaker-level input harness

LOCATION AND MOUNTING

Although these instructions explain how to install the GX-A422SI 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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English

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.

POWER AND GROUND CONNECTIONS

IMPORTANT: Disconnect the vehicle's negative (–) battery terminal before beginning the installation.

The GX A422SI amplifier is capable of delivering high power levels, and requires 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

the GX-A422SI uses 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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English

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 20A fuse 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 20A fuse in

the holder you installed near the battery.

Power

Connectors

Audio System

Head Unit

Chassis Ground

(bare metal)

20A Fuse 18" (46cm)

Remote Turn-On

(optional)

>#18AWG (0.82mm2) Wire

>#10AWG (5.26mm2) Wire

SPEAKER AND INPUT CONNECTIONS

Always connect the (+) speaker terminal on the ampliﬁer to the (+) terminal on the speaker and the (–) speaker terminal on the ampliﬁer 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.

SPEAKER CONNECTIONS

Minimum speaker impedance: 2 ohms (each)

Connect the left and right speakers to the L and R (+) and (–) terminals.

Left Speaker Right Speaker

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English

INPUT CONNECTIONS

Connect your source unit or processor's line outputs as shown in the illustration below.

L+L–R–R+

Source Unit

Line Outputs

See Set The Crossover Controls, on page 10, for information about setting the amplifier's controls.

USING THE SPEAKER-LEVEL INPUTS

If your source unit doesn't have line-level outputs you can use the included speaker-level input harness to connect

the amplifier to the source unit's speaker outputs. From left to right, the conductors are: L+, L–, R–, R+ (see the

illustration to the right).

SPEAKER CONNECTIONS: BRIDGED OPERATION

Bridged operation provides a single high-power channel for a subwoofer

Minimum speaker impedance: 4 ohms

Connect the subwoofer to the RL (+) and RR (–) terminals.) NOTE: You can connect two 2-ohm subwoofers in series to maintain the required 4-ohm

impedance for bridged operation.

Subwoofer

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English

INPUT CONNECTIONS: BRIDGED OPERATION

Connect your source unit or processor's subwoofer line output to the amplifier's left input, as shown in the illustration below.

NOTE: Use a "Y"-adapter to connect the source unit to the amplifier's left and right input jacks.

L+L–R–R+

Source Unit

"Y"-Adapter Subwoofer

Output

See Set The Crossover Controls, on page 10, for information about setting the amplifier's controls for bridged operation.

To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 7.

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