GT SERIES™
GT5-12
car auudio ssubwoofer
owner’ss manual
THANK YOU
®
™
for purchasing a JBL GT 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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CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER
The GT5-12 subwoofer has a single
4-ohm voice coil. Be sure to consider
your amplifier’s optimum load when
designing a subwoofer system. Many
bridgeable 2-channel amplifiers are
optimized to drive a single 4-ohm
woofer in bridged mode. If you will
use multiple woofers, be sure to
configure them to extract all the
power available from your amplifier.
When designing a subwoofer system,
consider the following rules:
2. Most amplifiers deliver exactly
the same amount of power
bridged into a 4-ohm load
as they do driving a 2-ohm
stereo load.
a. The total system impedance
of voice coils (or woofers) in
series can be calculated using
the formula:
Figure 1. Connecting two woofers
in series to the amplifier (8 ohms)
Red
Black
Red
Black
Positive
Negative
Positive
Negative
Impedance = w1 + w2 + w3 ...
3. If you are designing a multiple-
woofer system, be sure to configure
the woofers so that they each
receive the same amount of
power from the amplifier. Never
connect two identical woofers in
series and then connect that pair
to another woofer in parallel. If
your system will include an odd
number of woofers, be sure to
connect all the woofers in either
series or parallel according to
the rules that follow, in order to
maximize the power available
from your amplifier:
b. The total system impedance
of woofers in parallel can be
calculated using the formula:
To Amp
Positive
To Amp
Negative
1
Impedance=
Figure 2. Connecting two woofers in
parallel to the amplifier (2 ohms)
1
w1
1
1
w3
...
+
+
w2
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 system performance.
Red
Positive
Black
Negative
where w is the nominal
impedance of the woofer.
The diagrams at right show series
and parallel speaker connections.
Red
Positive
Black
Negative
To Amp To Amp
Positive Negative
3
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SPECIFICATIONS
GT5-12
12" (300mm) Single 4-Ohm Subwoofer
275W
Power Handling, RMS
Power Handling, Peak
Sensitivity (2.83V/1m)
Frequency Response
Impedance
1100W
93dB
23Hz – 450Hz
4 Ohms
Mounting Depth
6-7/16" (164mm)
11-1/4" (286mm)
12-5/16" (313mm)
Cutout Diameter
Overall Diameter
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
We, Harman Consumer Group International
2, route de Tours
72500 Château du Loir
France
© 2007 Harman International Industries, Incorporated. All rights reserved.
declare in own responsibility that the product described in this owner’s
manual is in compliance with technical standards:
JBL is a trademark of Harman International Industries, Incorporated,
registered in the United States and/or other countries. GT Series is a
trademark of Harman International Industries, Incorporated.
EN 61000-6-3:2001
EN 61000-6-1:2001
Klaus Lebherz
Harman Consumer Group International
Château du Loir, France 4/07
Part No. GT5-12OM4/07
www.jbl.com
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