JBL Speaker GT4 User Manual

GT4 SERIES  
Owner’s Manual  
Einbauanleitung  
Guide d’utilisation  
Manual del propietario  
Gebruikershandleiding  
Manuale utente  
Bruksanvisning  
Omistajan käsikirja  
Manual do utilizador  
Automotive Subwoofers Owner’s Manual GT4-10 GT4-12 GT4-15  
 
Connecting Your Subwoofer to Your Amplifier JBL GT4 Series  
Figure 1. Parallel connection  
JBL GT4 Series subwoofers are  
single 4-ohm voice coil. Depending  
on the amplifiers you are using, you  
may want to use either one or sev-  
eral subwoofers in the same enclo-  
sure to maximize the power avail-  
able from your amplifiers. To achieve  
the maximum amplifier output possi-  
ble, you should design a speaker  
system that provides the lowest  
impedance that your amplifier is  
rated to drive safely. When designing  
a subwoofer system, consider the  
following rules:  
2. We recommend that you avoid  
connecting separate woofers in  
series. The amplifier-damping  
factor (the amplifier’s ability to  
control the motion of the woofer)  
is expressed as a ratio of terminal  
impedance (the sum of speaker  
impedance, wire resistance and  
the D.C. resistance of any  
crossover coil connected to the  
woofer) to amplifier-output  
impedance. Therefore, connecting  
separate woofers in series  
reduces the damping factor of  
the amplifier to a value less  
than 1. This will result in poor  
transient response.  
3. 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:  
BLACK  
RED  
STRIPE  
NEG ( – )  
STRIPE  
POS ( + )  
POS ( + )  
NEG ( – )  
1
Impedance=  
1
1
1
. . .  
Figure 2. Series connection  
+
+
w1  
w2  
w3  
BLACK  
RED  
where w is the nominal  
impedance of the woofer.  
2. The total system impedance  
of woofers in series can be calcu-  
lated using the formula:  
STRIPE  
NEG ( – )  
STRIPE  
POS ( + )  
POS ( + )  
1. Don’t mix different subwoofer  
or enclosure types in the same  
system.  
NEG ( – )  
Impedance = w1 + w2 + w3 . . .  
The diagrams at right show parallel  
and series speaker connections.  
2
 
Specifications JBL GT4 Series  
GT4-10  
GT4-12  
GT4-15  
10" Automotive  
subwoofer  
12" Automotive  
subwoofer  
15" Automotive  
subwoofer  
Power handling (RMS)  
Power handling (Peak)  
250 Watts  
250 Watts  
250 Watts  
1000 Watts  
1000 Watts  
1000 Watts  
Sensitivity (2.83V/1m)  
Frequency response  
90dB  
93dB  
91dB  
28Hz – 500Hz  
23Hz – 450Hz  
20Hz – 400Hz  
Impedance  
4 Ohms  
147mm  
232mm  
4 Ohms  
159mm  
283mm  
4 Ohms  
172mm  
362mm  
Mounting depth  
Cut-out diameter  
Features, specifications and appearance are subject to change without notice.  
Declaration of Conformity  
We, Harman Consumer International  
2, route de Tours  
72500 Chateau-du-Loir  
FRANCE  
JBL Consumer Products • 250 Crossways Park Drive, Woodbury, NY 11797  
Europe: 2, route de Tours. 72500 Chateau-du-Loir  
declare in own responsibility, that the products described in this owner’s manual are in  
compliance with technical standards:  
©2003 JBL, Incorporated • JBL is a registered trademark of JBL, Incorporated  
Part No. GT4SUBSEROM  
EN 50081-1:1992  
EN 50082-1:1997  
Emmanuel Millot  
Harman Consumer International  
Chateau-du-Loir, FRANCE. 2/03  
3
 

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