JBL P1240 User Manual

Automotive Subwoofers Owner’s Manual P1040 P1042 P1240 P1242  
Connecting Your Subwoofer to Your Amplifier JBL Pro Power GTp Series  
Figure 2. Series connection  
To design a subwoofer system  
that maximizes available amplier  
power, keep the following rules  
in mind:  
1. The total system impedance of  
woofers in parallel = 1/(1/w1 +  
1/w2 + 1/w3...), where w is the  
nominal impedance of the  
woofer.  
JBL GTp subwoofers are available  
in two different congurations:  
single 4-ohm voice coil and dual  
4-ohm voice coils. Depending on  
the amplier you are using, you  
may use either single-voice-coil  
or dual-voice-coil subwoofers in  
singles or multiples to maximize  
the power available from your  
amplier. To achieve the maximum  
amplier output possible, you  
should design a speaker system  
that provides the lowest impedance  
that your amplier is rated to  
drive safely. When designing a  
subwoofer system, consider the  
following rules:  
2. You may connect the coils of a  
dual-voice-coil woofer in series,  
but NEVER connect separate  
woofers in series. Because the  
amplier-damping factor (the  
ampliers 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 amplier-output  
impedance, connecting separate  
woofers in series reduces the  
damping factor of the amplier  
to a value less than 1. This will  
result in poor transient response.  
3. You must use both coils of a  
dual-voice-coil woofer connected  
either in series or in parallel.  
4. Most ampliers deliver exactly  
the same amount of power  
bridged into a 4-ohm load  
BLACK  
RED  
STRIPE  
NEG ( )  
STRIPE  
POS ( + )  
POS ( + )  
NEG ( )  
2. The total system impedance  
of voice coils (or woofers) in  
series = w1 + w2 + w3...  
The diagrams below and at right  
show parallel and series speaker  
connections.  
Figure 1. Parallel connection  
1. Dont mix different subwoofer  
or enclosure types in the same  
system (use all single-coil  
BLACK  
RED  
STRIPE  
NEG ( – )  
STRIPE  
POS ( + )  
woofers or all dual-coil woofers).  
POS ( + )  
NEG ( – )  
as they do running a 2-ohm  
stereo load.  
03  
Specifications JBL Pro Power GTp Series  
P1040  
P1042  
P1240  
P1242  
10" Automotive subwoofer  
10" Automotive subwoofer,  
dual voice coil  
12" Automotive subwoofer  
12" Automotive subwoofer,  
dual voice coil  
Power handling (peak)  
Power handling (RMS)  
1400 Watts  
350 Watts  
1400 Watts  
350 Watts  
1400 Watts  
350 Watts  
1400 Watts  
350 Watts  
Sensitivity (2.83V/1m)  
Frequency response  
92dB  
92dB  
93dB  
93dB  
20Hz 500Hz  
20Hz 500Hz  
18Hz 500Hz  
18Hz 500Hz  
Impedance  
4 Ohms  
2 or 8 Ohms  
4 Ohms  
2 or 8 Ohms  
Mounting depth  
Cut-out diameter  
5-1/8" (131mm)  
9-1/8" (232mm)  
5-1/8" (131mm)  
9-1/8" (232mm)  
5-11/16" (145mm)  
11-1/8" (283mm)  
5-11/16" (145mm)  
11-1/8" (283mm)  
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  
1-800-336-4JBL (4525) www.jbl.com  
declare in own responsibility, that the products described in this owners manual are in  
compliance with technical standards:  
©2000 JBL, Incorporated • JBL is a registered trademark of JBL, Incorporated  
EN 50081-1:1992  
EN 50082-1:1992  
Made in USA Printed in USA 3/00  
Part No. P1040-42/P1240-42OM  
Lutz Uphoff  
Harman Consumer International  
FRANCE. 2/00  

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