JBL Car Speaker GT5 12 User Manual

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.  
 
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
 
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  
516.255.4JBL (4525) (USA only) www.jbl.com  
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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