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GRAND TOURING
®
SERIES
GTO1014
GTO1014D
GTO1214
GTO1214D
GTO1514
GTO1514 D
car audio subwoofer
owner’s manual
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.
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WARNING: Playing loud music
in an automobile can permanently
damage 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.
CHOOSING AN ENCLOSURE
Grand Touring Series subwoofers
are optimized to perform best in
small, sealed, vented and prefabricated band-pass 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 yourself. An optimum vented
enclosure is always larger than the
optimum sealed box for the same
woofer and will require more space
inside the vehicle.
Band-pass 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
band-pass enclosure. Band-passenclosure 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 band-pass
enclosure described in the enclosure design sheet included with this
woofer. Fortunately, there are many
prefabricated band-pass boxes
available and they are all optimized
to extract the most output possible
from any woofer. Band-pass
enclosures can be quite large and
may require a lot of space inside
your vehicle.
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CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER
JBL Grand Touring Series GTO
subwoofers are available in two
different configurations: a single
4-ohm voice coil or dual 4-ohm
voice coils. You may use GTO
subwoofers in singles or multiples
to maximize the power available
from your amplifier(s). 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
system. Subwoofers being used in
the same enclosure or powered
by the same amplifier should
be identical 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 dualvoice-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
w1w2w
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 = w1+ w2+ w3...
The diagrams at right show parallel
and series speaker connections.
Figure 1. Parallel connection
Figure 2. Series connection
...
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SPECIFICATIONS
GTO1014 GTO1014D GTO1214 GTO1214D GTO1514 GTO1514D
10" 4-Ohm 10" Dual 4-Ohm 12" 4-Ohm 12" Dual 4-Ohm 15" 4-Ohm 15" Dual 4-Ohm
Subwoofer Subwoofer Subwoofer Subwoofer Subwoofer Subwoofer
Power Handling, RMS 350W 350W 350W 350W 350W 350W
Power Handling, Peak 1400W 1400W 1400W 1400W 1400W 1400W
Sensitivity (2.83V/1m) 88dB 91dB 90dB 93dB 93dB 96dB
Frequency Response 25Hz – 400Hz 25Hz – 400Hz 23Hz – 400Hz 23Hz – 400Hz 23Hz – 400Hz 23Hz – 400Hz
Impedance 4 Ohms 8 Ohms/2 Ohms 4 Ohms 8 Ohms/2 Ohms 4 Ohms 8 Ohms/2 Ohms
Mounting Depth 5-7/8" (148mm) 5-7/8" (148mm) 6-5/16" (160mm) 6-5/16" (160mm) 6-13/16" (172mm) 6-13/16" (172mm)
Cutout Diameter 9" (228mm) 9" (228mm) 11" (278mm) 11" (278mm) 13-15/16" (354mm) 13-15/16" (354mm)
Overall Diameter 10-9/16" (268mm) 10-9/16" (268mm) 12-5/16" (313mm) 12-5/16" (313mm) 15-5/16" (389mm) 15-5/16" (389mm)
A valid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change without notice.
These products are designed for mobile applications and are not intended for connection to the mains.
Declaration of Conformity
Harman Consumer Group, Inc.
250 Crossways Park Drive, Woodbury, NY 11797 USA
516.255.4JBL (4525) (USA only) www.jbl.com
© 2008 Harman International Industries, Incorporated. All rights reserved.
JBL and Grand Touring Series are trademarks of Harman International Industries,
Incorporated, registered in the United States and/or other countries.
Part No. GTO-14SUBOM3/08
We, Harman Consumer Group, Inc.
2, route de Tours
72500 Château 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, Inc.
Château du Loir, France 3/08
www.jbl.com
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