JBL Speaker GT1041 User Manual

A U T O M O T I V E S U B W O O F E R S  
SERIES  
Grand Touring® Series  
GT1041, GT1041D, GT1081, GT1241, GT1241D, GT1281  
Owners Manual  
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Figure 2. Series connection  
To design a subwoofer system that  
m axim izes available am plifier power,  
keep the following rules in m ind:  
1. The total system im pedance of  
woofers in parallel = 1/(1/w1 + 1/w2  
1/w3...) where w is the nom inal im ped-  
ance of the woofer.  
2. The total system im pedance of voice  
Connecting Your Subw oofer to Your  
Am plifier  
2. You m ay connect the coils of a dual-  
voice-coil woofer in series, but NEVER  
connect separate woofers in series.  
Because the am plifier-dam ping factor  
(the am plifiers ability to control the  
m otion of the woofer) is expressed as  
a ratio of term inal im pedance (the sum  
of speaker im pedance, wire resistance  
and the D.C. resistance of any  
crossover coil connected to the  
woofer) to am plifier-output im ped-  
ance, connecting woofers in series  
reduces the dam ping factor of the  
am plifier to a value less than 1. This  
will result in poor transient response.  
3. You m ust use both coils of a dual-  
voice-coil woofer either in series or in  
parallel.  
J BL GT Series subwoofers are available  
in three different configurations: single  
4-ohm voice coil, single 8-ohm voice coil  
and dual 4-ohm voice coils. Depending  
on the am plifier you are using, you m ay  
use either single- or dual-voice-coil  
subwoofers in singles or m ultiples to  
m axim ize the power available from your  
am plifier. To achieve the m axim um  
am plifier output possible, you should  
design a speaker system that provides  
the lowest im pedance that your am plifier  
is rated to drive safely. When designing  
a subwoofer system , abide by the  
following rules:  
+
coils (or woofers) in series = w1  
2 + w3...  
+
w
The diagram s below and at right show  
parallel and series speaker connections.  
Figure 1. Parallel connection  
1. Dont m ix different subwoofer or enclo-  
sure types in the sam e system (use all  
single-coil 4-ohm woofers, all single-  
coil 8-ohm woofers, or all dual-coil  
woofers).  
4. Most am plifiers deliver exactly the  
sam e am ount of power bridged into  
a 4-ohm load as they do running a  
2-ohm stereo load.  
0 3  
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Specifications  
GT1041  
GT1041D  
GT1081  
GT1241  
GT1241D  
GT1281  
Configuration  
10" subwoofer  
10" subwoofer  
10" subwoofer  
12" subwoofer  
12" subwoofer  
12" subwoofer  
Recom m ended Am plifier  
Pow er Range  
18W – 275W  
4 ohms  
18W – 275W  
dual 4 ohms  
90dB  
18W – 275W  
8 ohms  
18W – 300W  
4 ohms  
18W – 300W  
dual 4 ohms  
93dB  
18W – 300W  
8 ohms  
Im pedance  
Sensitivity  
90dB  
90dB  
93dB  
93dB  
Frequency Response  
Mounting Depth  
20Hz – 500Hz  
20Hz – 500Hz  
20Hz – 500Hz  
18Hz – 500Hz  
6" (153m m )  
18Hz – 500Hz  
6" (153m m )  
18Hz – 500Hz  
6" (153m m )  
5-3/8" (137m m )  
9-1/4" (235m m )  
5-3/8" (137m m )  
9-1/4" (235m m )  
5-3/8" (137m m )  
9-1/4" (235m m )  
Cut-Out Diam eter  
11-1/8" (283m m )  
11-1/8" (283m m )  
11-1/8" (283m m )  
Declaration of Conformity  
We, JBL Europe A/S  
Kongevejen 194B  
DK-3460 Birkerod  
DENMARK  
declare in own responsibility, that the products  
described in this owner’s manual are in compliance  
with technical standards:  
EN 50081-1:1992  
EN 50082-1:1992  
Steen Michaelsen  
JBL Europe A/S  
JBL Consumer Products, 250 Crossways Park Drive, Woodbury, NY 11797  
800-336-4JBL (4525) www.jbl.com Part No. GTSUBOM Made in USA  
Birkerod. DENMARK. 5/99  
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