GRAND TOURING SERIES
Automotive Powered
Subwoofer Systems
GT650P & GT800P Owner’s Manual
GENUINE JBL
02
Thank You for selecting a
JBL GT Series Powered
Subwoofer System. JBL’s history
of high performance and innovation goes back 50 years, yet the
only things old-fashioned about
the GT Series products are the
craftsmanship and attention to
detail that go into each one. The
model you have chosen delivers
exceptional performance in a
compact package. With proper
installation and use, it will provide many years of listening
pleasure.
GT Powered Subwoofer
Features
Your Powered Subwoofer features a built-in amplifier and
electronic crossover capable of
supplying 80 watts of power to
the specially designed Dual
Voice Coil 2-ohm woofer. The
built-in crossover features an
adjustable low-pass filter and
level, facilitating simple matching to virtually all main speaker
systems. In addition, this unit
will accept signals from either
preamp level, or speaker level
inputs, allowing connection to
virtually all source units whether
supplied by the car manufac-
turer or purchased separately. A
built-in music sensing circuit will
turn the unit on in the presence
of a music signal without the
need to run a separate remote
turn-on wire. The unit will turn
off automatically a few minutes
after the music stops to conserve
battery power.
Installation
We recommend that you have
your JBL system professionally
installed by an authorized JBL
automotive dealer. However, if
you prefer to perform the installation yourself, please read the
following information in order to
get the most from your GT Series
Subwoofer.
General Installation Guidelines
Placement and Warnings
Your JBL speakers are designed
for the rigors of the automotive
environment and can withstand
high and low temperatures as
well as extreme humidity.
However, you can effectively
increase the life of your speakers
by avoiding installations that
expose them directly to moisture
or water. For safety and reliability, they should be securely fastened to prevent them from moving around when driving, or from
becoming dangerous missiles in
the event of an accident or sudden stop.
Select your mounting locations
very carefully so as to avoid cutting or drilling into critical components such as brake or fuel
lines, and electrical wiring,
which may be damaged when
drilling holes for the mounting
screws. Be especially cautious
because these components may
be hidden between double-walled
panels.
The mounting locations for optimum performance will vary from
vehicle to vehicle, but in general
your Powered Subwoofer will
work well just about anywhere:
In the trunk, hatch area, or any
surface large enough to accommodate it. Just make sure to
keep at least 3" clearance around
the port end of the unit so that
you do not restrict port airflow.
Unlike some other brands, your
JBL subwoofer does not require
corner loading for optimum performance, which means that it
may be pointed whichever way is
most convenient for your particular installation. Pointing the unit
into a corner will increase its low
frequency output, which will
please some listeners. Others
might find this increase too
much, and will prefer pointing
the unit away from the corner.
Since each vehicle model has different acoustic characteristics,
we recommend experimentation
with placement before permanently mounting your subwoofer.
Also, leave space around the
amplifier end of the unit so that
airflow is not restricted, otherwise the unit may overheat and
activate its protection circuitry.
03
Installing JBL tie-down straps
with your JBL subwoofer
GT650P or GT800P.
04
Figure 1
Securing Your Speakers
The GT Subwoofers must be
securely fastened to the vehicle
with screws, brackets, and/or the
included tie-down straps to prevent movement of the speaker
system while the car is in motion.
A secure mounting will also
improve the bass performance.
Again, because each vehicle is
different, your ingenuity will play
a major role in how and where
you mount your unit. If you do
not feel that you have the skills
or the tools necessary to properly
and safely mount your unit,
please refer the installation to an
authorized JBL dealer. Refer to
Figure 1 for a diagram of how to
use the tie-down straps to secure
the subwoofer to its mounting
surface. When using the strap,
make sure that it is pulled tight.
Wiring
Power Connections
Connect the Black ground wire
coming from the amplifier module to the vehicle chassis. Keep
this wire as short as possible. If
you need to extend it, use a minimum #12AWG stranded copper
wire.
Connect the Red wire to a source
of constant
are installing your unit in a system which uses a high-quality
power distribution system, your
GT Powered Subwoofer can be
connected to an unused output of
a distribution block. Otherwise,
the power wire should be
extended with a minimum
#12AWG power cable and con-
+12V power. If you
nected directly to the vehicle
battery. Install a fuseholder with
a 15-amp fuse at the battery end
of this cable. Keep the fuseholder
as close as possible to the battery
(within 18" if possible) and be
sure that it is installed between
the battery and the point where
the wire passes through the firewall or the closest metal panel.
A high-value power supply
capacitor mounted close to the
GT Subwoofer will enhance its
performance.
L
R
80
250
X-OVER
SIGNAL
POWER
VOLUME
L
R
+
+
–
–
HIGH
LEVEL
INPUT
80
WATTS
LINE
LEVEL
INPUT
+–
SPEAKER
OUTPUTS
PREAMP OUTPUTS
MIN. AWG#12 POWER WIRE
IN-LINE FUSEHOLDER
WITH 15A FUSE
INSTALLED AT
VEHICLE
CHASSIS
GROUND
USE EITHER PREAMP
OR SPEAKER LEVEL
CONNECTION
Connection Diagram
GT Series Powered Subwoofers
SOURCE UNIT
12V
05
Figure 2
06
Input Connections
Your GT Subwoofer may be
driven either with the preamp
output or speaker level output
of your source unit. The input
impedance of the GT amplifier
module is such that a “y-connector” may be used to connect your
source unit simultaneously to the
GT Subwoofer and an external
power amplifier used to drive the
main speakers when the preamp
level connection is used.
Equivalently, if you are using
the speaker-level connection,
you can connect the Powered
Subwoofer in parallel with the
speakers. The Powered
Subwoofer will sample the
signal, but will not load the
source unit the way a second
pair of conventional speakers
would, so you do not need to
worry that this connection will
lower the speaker impedance
too far for your amplifier or
source unit.
If you are using two GT Powered
Subwoofers, only one input
channel needs to be used on
each subwoofer.
Please refer to Figure 2 on
page 5 for a wiring diagram.
Adjustments
Volume Level and Crossover
Frequency (labeled ”X-Over”)
adjustments are done by ear. The
Crossover Frequency may be
adjusted over the range of 80Hz
to 150Hz. Midpoint on the X-Over
scale is at 125Hz. The knob at
“9:00” equals 100Hz, and at
“3:00” equals 175Hz.
1. We recommend starting your
setup procedure with the
volume control set at the
minimum, and the X-Over set
at the most counterclockwise
(80Hz) position.
2. Increase the volume level of
the source unit to the maximum listening position. This
is the point where the main
speakers in the system begin
to sound slightly distorted.
3. Back off on the source unit’s
volume control until just below
the point where you hear distortion. Slowly increase the
Powered Subwoofer volume
control until you begin to hear
slight distortion from the subwoofer. Mark or remember the
position of the Powered
Subwoofer volume knob and do
not exceed this point in subsequent adjustments.
4. Adjust the volume control so
that the bass level is balanced
to your taste from the listening
position.
Specifications
5. Slowly raise the crossover
frequency while listening for
the smoothest response. When
the frequency is properly
adjusted, bass will be solid
and powerful, but vocals will
not be overly bass heavy. If
the subwoofer seems to be
affecting the vocal range,
adjust the frequency
downward.
Service
Should your loudspeaker ever
need service, return it to
the JBL dealer from whom it
was purchased. If for some
reason this is impractical, call
800-336-4JBL for your nearest
Model GT650P GT800P
Description 6-1/2" Powered Tube Subwoofer 8" Powered Tube Subwoofer
Maximum Output Power 80 Watts 80 Watts
Continuous Output Power 50 Watts @ <1% THD 50 Watts @ <1% THD
Crossover Frequency Range 80 – 250Hz 80 – 250Hz
Frequency Response 50 – 250Hz 40 – 250Hz
Dimensions (HxWxD) 12-1/8 x 8-1/8 x 12-1/8 inches 14 x 10-1/8 x 12-1/8 inches
308 x 206 x 308mm 356 x 257 x 308mm
warranty station. Do not return
products to the JBL factory
without prior authorization.
General Care
The loudspeaker grilles may
be cleaned with a slightly
damp cloth.
To remove dust from the carpet
use a vacuum with a brush
attachment. Spots on the
carpet may be removed with a
commercial spot remover.
Do not use any cleaners or
solvents on the grilles or the
speaker drivers.
Safety Note
To avoid the dangers of accidental suffocation, please properly
dispose of the plastic bag used in
the speaker packaging.
07
Declaration of Conformity
We, JBL Europe A/S
Kongevejen 194B
DK-3460 Birkerød
DENMARK
declare in own responsibility, that the products described
in this owner’s manual are in compliance with technical
standards:
EN 50 081-1/1992
EN 50 082-1/3.1995
Steen Michaelsen
JBL Europe A/S
Birkerød. DENMARK. 4/97
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Warranty Terms:
This is an important document. Attach
your bill of sale to this page and keep it
in a safe place. Your bill of sale is your
warranty.
The JBL warranty remains in effect for
one year from the date of the first consumer purchase unless installed by an
authorized JBL dealer. Installation by
an authorized JBL dealer will extend the
warranty to a period of two years.
Who is Protected by this Warranty
The JBL warranty protects the original
owner and all subsequent owners providing that the JBL product was purchased
from an authorized dealer in the United
States or purchased by military personnel from an authorized military outlet.
A copy of the original dated bill of sale
must be presented whenever warranty
service is required.
What is Covered by this Warranty
Except as specified below, the JBL warranty covers all defects in material and
1 Year Transferable Limited Warranty / 2-Year Extended Transferable Limited Warranty
workmanship. The following are not covered: Damage caused by accident, misuse, abuse, product modification or
neglect; damage occurring during shipment; damage from failure to follow
instructions contained in the instruction
manual; damage resulting from the performance of repairs by someone not
authorized by JBL; damage caused by
installation of parts that do not conform
to JBL specifications; units used for
commercial or business use; any claims
based on misrepresentations by the
seller; products sold on an “as-is” or
final sale basis; or the cost of installing,
removing, or reinstalling the unit. JBL’s
liability is limited to the repair or
replacement, at our option, of any
defective product and shall not include
incidental or consequential damages.
JBL reserves the right to replace a
discontinued model with a comparable
model. Any replacement units or parts
may be new or rebuilt.
JBL Consumer Products
80 Crossways Park West
Woodbury, NY 11797
8500 Balboa Blvd.
Northridge, CA 91329
800-336-4JBL (4525)
Part No. GT650800OM
Made in USA
To Obtain Warranty Service
If you require warranty service, please
return the product to your dealer. If this
is not possible and you live in the United
States, please call 1-800-336-4JBL, f or
information on how to obtain service or
replacement.
If purchased outside the United States,
contact your local dealer for repair or
replacement.
Do Not Return Products to the JBL
Factory without Authorization. They will
be Returned Unopened.
You are responsible for transporting
your product for repair or replacement.
JBL will pay reasonable return charges
for delivery to any location in the United
States if the repair or replacement is
covered under the warranty.
Correspondence with JBL should be
addressed to: JBL Customer Service,
80 Crossways Park West, Woodbury,
NY 11797 or fax us at 516-496-0812.
Outside the United States, please contact your local distributor.
This warranty gives you specific legal
rights. You may also have other rights
which vary from state to state. Some
states do not allow the exclusion or limitation of incidental or consequential
damages or limitations on how long an
implied warranty lasts, so the above
may not apply to you.
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