A302GTi - JBL Car Audio User Guide / Operation Manual. Page 2

Thank you for purchasing a JBL 
GTi Series amplifier. In order that 
we may better serve you, should you
require warranty service on your new
amplifier, please retain your original
purchase receipt and return the
enclosed warranty registration card.

Warning: Playing loud music in 
an automobile can hinder your 
ability to hear traffic as well as 
permanently damage your hearing. 
We recommend listening at low 
levels while driving. JBL accepts no
liability for hearing loss, bodily injury 
or property damage resulting from 
use or misuse of this product. 

Important: Installation of 
automotive stereo components 
can require extensive experience in 
performing a variety of mechanical
and electrical procedures. Although
these instructions explain how to
install GTi Series amplifiers in a 
general sense, they may not show 
the exact installation methods for 
your particular vehicle. If you feel 
you lack the tools or experience 
necessary, ask your authorized JBL
car audio dealer about professional
installation options.

Installation Warnings and Tips  
• Always wear protective eyewear

when using tools.

• Turn off all audio systems 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 any holes or 
installing any screws. Remember 
that 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. 

• When making connections, ensure 

that they are secure and properly 
insulated.

• If the amplifier’s fuse must be 

replaced, use only the same type 
and rating as a replacement. Do 
not substitute another kind.

Choosing a Location and 
Mounting the Amplifier  
Amplifiers need air to stay cool.
Suitable mounting locations are 
under seats (provided the amplifier
doesn’t interfere with the seat 
adjustment mechanism), in the trunk
or in any other location that provides
enough air for the amp to cool itself.
Do not mount the amplifier with the
heatsink facing downward, as this
makes convection cooling of the
amplifier impossible.

Mount the amplifier so that it is not
damaged by the feet of back-seat
passengers or by the shifting of cargo
in the trunk. Mount the amplifier so
that it remains dry – never mount an
amplifier outside the car or in the
engine compartment. 

Using the amplifier as a template,
mark the location of the mounting
holes on the mounting surface, drill
pilot holes, and attach the amplifier 
to the mounting surface using 
screws. Make sure the amplifier 
is mounted securely.

02

The Official Brand of Live Music

SPEAKER OUTPUTS

+BATT REM

POWER

GND

+

CAPTAP

FUSES 40A x 3

—

A1201GTi

R

L

INPUT
LEVEL

4V 55mV

REMOTE

LPF

FREQ

30Hz   320Hz

BASS

BOOST

0dB  +6dB

HEAD

UNIT

STATUS

MONITOR

REM

(GRN)

+BATT

(RED)

GND

(BLK)

CAR BODY

(GROUND)

CAR

BATTERY

+

CAR BODY
(GROUND)

+

—

EXTERNAL
CAPACITOR
(OPTIONAL)

SUBWOOFER

FUSE/CIRCUIT 
BREAKER

FUSE/CIRCUIT BREAKER 
AND WIRE SIZE MUST BE
APPROPRIATELY SIZED FOR 
THE ELECTRICAL LOAD OF 
THE SYSTEM. INSTALLATION 
SHOULD BE WITHIN 18 INCHES 
OF THE BATTERY + TERMINAL.       

SUB LEVEL 

CONTROL

SUB LEVEL

MIN

MAX

LEFT SIDE
OF
AMPLIFIER

R

L

FRONT INPUTS

REAR INPUTS

RIGHT SIDE
OF
AMPLIFIER

SUBWOOFER