GTO 1202D — JBL Car Audio User Guide / Operation Manual

Model
GTO 1202D
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
349.29 KB
Type
PDF
Document
User Guide / Operation Manual
Brand
Device
Car Audio
File
gto-1202d.pdf
Date

View JBL GTO 1202D User Guide / Operation Manual online

THANK YOU 
for purchasing a JBL Grand Touring
®
Series subwoofer. 
Subwoofer installation requires woodworking skills and some
experience in disassembling and reassembling automotive 
interiors. If you lack the tools or necessary skills, have your 
subwoofer installed by an authorized JBL dealer.
GRAND TOURING
®
SERIES
GTO804
GTO1002D
GTO1004D
GTO1202D
GTO1204D
GTO1502D
GTO1504D
car audio subwoofer
owner’s manual
English
2
CHOOSING AN ENCLOSURE
Warning: Playing loud music in
an automobile can permanently dam-
age your hearing as well as 
hinder your ability to hear traffic. 
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.
Grand Touring Series subwoofers
are optimized to perform best in
small, sealed, vented and prefabri-
cated bandpass enclosures. While
infinite-baffle mounting of GTO subs
is possible, power handling will 
be greatly compromised because
there’s no enclosed volume of air 
to prevent the speaker’s cone from
moving past its limit. For this reason,
we do not recommend infinite-baffle
mounting for GTO subwoofers.
You should choose the enclosure you
will use based on the type of music
you listen to, how much amplifier
power you will use for the subwoofer
and how much space inside the
vehicle you can devote to a
subwoofer enclosure.
Because a sealed enclosure 
provides the most control over 
the woofer’s movement, a woofer
mounted in a sealed enclosure will
handle more power than a woofer
mounted in another enclosure type.
Sealed enclosures provide more
accurate sonic reproduction than
other enclosure types when 
mounted inside a vehicle, so they are
well-suited to all types of music.
Sealed-enclosure construction is
straightforward and there are many
prefabricated sealed enclosures
available. An optimum sealed 
enclosure is always smaller than
other types of enclosures optimized
for a particular speaker, so they
require the smallest amount of space
inside the vehicle.
Vented enclosures provide better 
efficiency in the 40Hz – 50Hz range
but this efficiency comes at the
expense of sound in the lowest
octave (below 40Hz) and at the
expense of some control and power
handling at the lowest frequencies. 
If you are using a small amplifier, 
a vented box will provide more 
perceived bass output from less
power. Vented enclosures are also
well-suited to a variety of music
types. Because vented enclosures
require the volume of the enclosure
and the size of the port to have a
specific relationship with the 
characteristics of the woofer, the
enclosure must be built exactly to the
specifications provided. While there
are some prefabricated vented boxes
available, matching a prefabricated
box to a particular woofer is difficult.
If you wish to use a vented
enclosure, we strongly recommend
having your authorized JBL dealer
build it or verify that your design is
correct if you wish to build it your-
self. An optimum vented enclosure is
always larger than the optimum
sealed box for the same woofer and
will require more space inside the
vehicle. 
Bandpass enclosures often provide
the most output available from any
amplifier and subwoofer combination
at the expense of sonic accuracy. 
If sheer SPL (sound-pressure level) is
what you desire most, choose a
bandpass enclosure. Bandpass-
enclosure design is very tricky and
the aid of a computer and enclosure
design software is necessary. If you
are an experienced installer or have
some woodworking experience, 
you may wish to build the bandpass
enclosure described in the enclosure
design sheet included with this
woofer. Fortunately, there are many
prefabricated bandpass boxes 
available and they are all optimized
to extract the most output possible
from any woofer. Bandpass enclo-
sures can be quite large and may
require a lot of space inside your
vehicle.
JBL Grand Touring Series 
subwoofers are available in two 
different configurations: as dual 
4-ohm voice coils or as dual 2-ohm
voice coils. Depending on the 
amplifiers you are using, you may
use GTO subwoofers in singles or
multiples to maximize the power
available from your amplifiers. To
achieve the maximum amplifier 
output possible, you should design 
a speaker system that provides 
the lowest impedance that your
amplifier will drive safely. When
designing a subwoofer system, 
consider the following rules:
1. Do not mix different subwoofers or
enclosure types in the same sys-
tem. Subwoofers being used in the
same enclosure or powered from
the same amplifier should be iden-
tical models. Mismatched woofers
and enclosures can result in poor
performance from your subwoofer
system.
2. You may connect the coils of a
dual-voice coil woofer in series,
but we recommend that you avoid
connecting separate woofers in
series. 
3. You must use both coils of a dual-
voice coil woofer connected either
in series or in parallel.
4. Most amplifiers deliver exactly the
same amount of power bridged
into a 4-ohm load as they do
running a 2-ohm stereo load.
To design a subwoofer system 
that maximizes available amplifier
power, keep the following rules 
in mind: 
1. The total system impedance 
of woofers in parallel can be 
calculated using the formula:  
Impedance =
1
 1 
+
 1 
+
 1  ...
w
1
w
2
w
3
where w is the nominal 
impedance of the woofer.
2. The total system impedance of
voice coils (or woofers) in series
can be calculated using the
formula:
Impedance = w
1
+ w
2
+ w
3
...
The diagrams at right show parallel
and series speaker connections.
3
Figure 1. Parallel connection
Figure 2. Series connection
CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER
English
Declaration of Conformity
We, Harman Consumer Group International
2, route de Tours 
72500 Chateau-du-Loir
France
declare in own responsibility that the products described in this owner’s
manual are in compliance with technical standards: 
EN 61000-6-3:2001
EN 61000-6-1:2001
Klaus Lebherz
Harman Consumer Group International
Chateau-du-Loir, France  4/05
JBL Consumer Products 
250 Crossways Park Drive, Woodbury, NY 11797 USA
516.255.4JBL (USA only)  www.jbl.com
© 2005 Harman International Industries, Incorporated
JBL and Grand Touring are registered trademarks 
of Harman International Industries, Incorporated.
Part No. GTOSUBOM4/05
www.jbl.com
SPECIFICATIONS
GTO804
GTO1002D
GTO1004D
GTO1202D
GTO1204D
GTO1502D
GTO1504D
8" Single 4-Ohm 
10" Dual 2-Ohm
10" Dual 4-Ohm
12" Dual 2-Ohm
12" Dual 4-Ohm
15" Dual 2-Ohm
15" Dual 4-Ohm
Subwoofer
Subwoofer
Subwoofer
Subwoofer
Subwoofer
Subwoofer
Subwoofer
Power Handling, RMS
200W
250W
250W
300W
300W
300W
300W
Power Handling, Peak
800W
1000W
1000W
1200W
1200W
1200W
1200W
Sensitivity (2.83V/1m)
91dB
91dB
91dB
93dB
93dB
93dB
93dB
Frequency Response
30Hz – 400Hz
25Hz – 400Hz
25Hz – 400Hz
23Hz – 400Hz
23Hz – 400Hz
23Hz – 400Hz
23Hz – 400Hz
Impedance
4 Ohms
4 Ohms/1 Ohm
8 Ohms/2 Ohms
4 Ohms/1 Ohm
8 Ohms/2 Ohms
4 Ohms/1 Ohm
8 Ohms/2 Ohms
Mounting Depth
112mm (4-3/8")
116mm (4-9/16")
116mm (4-9/16")
129mm (5-1/16")
129mm (5-1/16")
143mm (5-5/8")
143mm (5-5/8")
Cutout Diameter
180mm (7-1/16")
234mm (9-3/16")
234mm (9-3/16")
285mm (11-3/16")
285mm (11-3/16")
342mm (13-7/16")
342mm (13-7/16")
Overall Diameter
210mm (8-1/4")
264mm (10-3/8")
264mm (10-3/8")
316mm (12-7/16")
316mm (12-7/16")
383mm (15-1/16")
383mm (15-1/16")
Specifications and appearance are subject to change without notice.
Page of 4

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