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car audio

power amplifier

owner’s manual

THANK YOU

for purchasing a JBL A6000GTi or A3000GTi amplifier.

For warranty support, please register your purchase at

www.jbl.com. Select Car Audio, then click on Product

Support, and then click on Register...Online. Also, please

retain your original purchase receipt and packing crate

in case you must ship your unit back for service.

INSTALLATION

WARNING: Playing loud music

in an automobile can hinder your

ability to hear traffic and permanently

damage your hearing. We recommend

listening at low or moderate levels

while driving your car. JBL accepts

no liability for hearing loss, bodily

injury or property damage resulting

from the use or misuse of this product.

IMPORTANT: To get the best

performance from your JBL A6000GTi

or A3000GTi amplifier, we strongly

recommend that installation be

entrusted to a qualified professional.

Although these instructions explain

how to install JBL 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

• Always wear protective eyewear

when using tools.

• Turn off all audio components and

other electrical devices before you

start. Disconnect the (–) negative

lead from your vehicle’s battery.

• Check clearances on both sides of

a planned mounting surface before

drilling holes or installing screws.

Remember – the screws can extend

behind the surface.

• At the installation sites, locate

and make a note of all fuel lines,

hydraulic brake lines, vacuum lines,

and electrical wiring. Use extreme

caution when cutting or drilling in

and around these areas.

• Before drilling or cutting holes, use

a utility knife to remove unwanted

fabric or vinyl to keep material from

snagging in a drill bit.

• When routing cables, keep input-

signal cables away from power

cables and speaker wires. Use

grommets when passing cables

through the vehicle’s inner walls.

• When making connections, observe

the amplifier’s polarity markings.

Make sure that each connection

is clean and properly secured. Use

the shortest ground wire possible

to minimize resistance and avoid

noise problems.

• If the amplifier’s fuse must be

replaced, use only the same type

and rating as that of the original.

Do not substitute another kind.

CHOOSING A

MOUNTING LOCATION

The JBL A6000GTi and A3000GTi

amplifiers are big! Conventional

mounting locations under driver or

passenger seats will not accommodate

either amplifier. Mount the amplifier in

the vehicle’s trunk or cargo area, but

never mount the amplifier in the engine

compartment, outside the vehicle or

in any location where it may get wet.

When choosing a location, make sure

the site’s underlying structure is strong

enough to support the amplifier’s

weight and drilled holes for mounting

bolts. Also, verify that there will be

adequate ventilation around the

amplifier, so that airflow to its internal

fans will not be blocked and the unit

can properly cool itself.

WARNING: To avoid personal injury

and possible product damage, we

strongly urge you to enlist additional

help in unpacking and moving the

JBL A6000GTi or A3000GTi amplifier

to a desired mounting location.

PARTS LIST

Each amplifier is packed with the fol-

lowing parts:

• Four (4) 1/2" x 3" socket-head cap

screws and T-nuts.

• One (1) Remote Level Control with

mounting hardware

• One (1) 15' RJ11 Cable for Remote

Level Control

• One (1) Logo Badge

• One (1) Set of Performance Graphs

• One (1) Owner’s Manual

• One (1) Warranty Registration

Instruction Card

MOUNTING THE

AMPLIFIER

We strongly recommend first mounting

a piece of wood or Medium Density

Fiberboard (MDF) to the vehicle, and

then mounting the amplifier to the

board. The amplifier is large and heavy

and must be mounted using all four

screws and T-nuts provided. Using

the amplifier as a template, mark the

location of the mounting holes on the

mounting surface, drill pilot holes, and

securely attach the amplifier to the

mounting surface with the provided

screws and T-nuts. Make sure the

amplifier does not pinch or smash

power cables, speaker wires, input

cables or any of the vehicle’s wiring.

Install the Remote Level Control in a

convenient location in or under the

dashboard. The control may be

removed from its housing for custom

installation. Using the enclosed RJ11

cable, connect the control to the

amplifier, as shown in Figure 1.

A6000GTi/A3000GTi

(on input panel)

RJ11 Cable

RJ45 connector

RJ45 connector on back

Figure 1. Connecting the Remote Level

Control.

Once the amplifier is mounted, peel the

backing from the adhesive (on the back

of the logo badge) and attach the

badge in the appropriate orientation.

DESIGNING A SPEAKER SYSTEM FOR THE GTi AMPLIFIER

NOTE: Although the JBL A6000GTi or

A3000GTi amplifier will drive a system

made up of any subwoofers, we

recommend using JBL GTi subwoofers

with GTi amplifiers.

Both the JBL A6000GTi and A3000GTi

amplifiers provide RMS power that

exceeds the RMS power-handling

rating of nearly every subwoofer

available. To use this amplifier

optimally, you should design a speaker

system made up of several identical

speakers, so that the power delivered

by the amplifier will be shared equally

among the speakers.

The JBL A6000GTi and A3000GTi

amplifiers support a wide range of

impedances, and any speaker system

with a total or equivalent impedance of

1 to 4 ohms will extract full power from

either amplifier. In order to connect

multiple woofers to the A6000GTi or

A3000GTi, you’ll need to connect your

speakers in series, parallel or series-

parallel. We’ve included diagrams for

each connection scheme and a pair of

formulas, which will help you.

SERIES CONNECTIONS

The formula for determining the total

impedance of the two woofers con-

nected in series is:

Ztotal = Z1+ Z2+ Z3...

Where Z total is the total impedance of

all woofers connected in series. Z1, Z2

and Z3(and so on) are the nominal

impedance ratings of the individual

speakers. The total impedance of the

voice coils shown in Figure 2 is 8 ohms.

Figure 2. Series connection of two

4-ohm voice coils yields a total

impedance of 8 ohms.

PARALLEL

CONNECTIONS

The formula for determining the

equivalent impedance of the voice

coils connected in parallel is:

Zequivalent = 1/(1/Z1+ 1/Z2+ 1/Z3…)

Where Zequivalent is the equivalent

impedance of the coils connected in

parallel. Z1, Z2and Z3(and so on) are

the nominal impedance ratings of the

individual speakers. The equivalent

impedance of the voice coils shown in

Figure 3 is 2 ohms.

Figure 3. Parallel connection of two

4-ohm voice coils yields a total

impedance of 2 ohms.

DUAL VOICE-COIL

CONNECTIONS

Dual voice-coil subwoofers, such as

JBL’s GTi series, may be connected

in series, as shown in Figure 2; in

parallel, as shown in Figure 3; or in

series-parallel, as shown in Figure 4.

Figure 4. Series-parallel connections

of three W15GTi subwoofers (with a

voice coil impedance of 6 ohms) yields

a total series impedance of 12 ohms

for each subwoofer, and an equivalent

parallel impedance of 4 ohms for all

three subwoofers.

To determine the impedance of a

system of three W15GTi (dual voice-

coil) subwoofers connected in series-

parallel, use the series connection

formula to determine the impedance

of each subwoofer with its voice coils

connected in series. Then insert the

calculated value into the parallel

connection formula to determine the

equivalent impedance for the three

subwoofers connected in parallel.

NOTE: Each W15GTi voice coil has an

impedance of 6 ohms.

For example, in Figure 4, each woofer

will have an impedance of 12 ohms, by

Ztotal = Z1+ Z2= 6 + 6 = 12

and the three woofers connected

in parallel will have an equivalent

impedance of 4 ohms, by

Zequivalent = 1/(1/Z1+ 1/Z2+ 1/Z3)

= 1/(1/12 + 1/12 + 1/12)

= 1/(3/12)

= 12/3 = 4

NOTE: All subwoofers connected to an

amplifier in a system must be identical

and, if they are dual voice-coil sub-

woofers, their coils must be wired

identically. Do not connect the coils of

one subwoofer together in series and

another in parallel, since doing so will

cause uneven power distribution,

potential damage to the speakers, and

poor overall performance.

ABOUT SPEAKER

POWER HANDLING

The RMS power handling rating of

a speaker indicates the amount of

power it will handle continuously.

Although designing a subwoofer

system by considering the RMS rating

will ultimately provide you with the

most reliable system, your speakers

may be able to handle more power,

depending on what kind of music is

being reproduced.

For music with extended bass notes

(e.g., bass music, hip-hop or techno),

you should design a speaker system

based on the RMS power handling of

your speakers. For music with sharp

transient bass notes (e.g., rock,

country or jazz), the RMS power

handling rating is conservative, and

you can count on your speakers being

able to handle more power than the

RMS rating.

The total power output of your

amplifier will be divided among the

speakers connected to it. For example,

if you are using an A6000GTi and three

W15GTi subwoofers, each subwoofer

will receive 2,000 watts.

It’s important to choose a system of

subwoofers that will handle all of the

power. To determine how much total

power your speaker system will

handle, simply multiply the RMS power

handling rating of one of your speakers

by the total number of speakers that

will be connected.

4 ohms 4 ohms

Remove

Terminal Jumper

Remove

Terminal Jumper

Black

Red

4 ohms 4 ohms

Produktspecifikationer

Varumärke:	JBL
Kategori:	mottagare
Modell:	A3000GTi

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