™
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
Download from Www.Somanuals.com. All Manuals Search And Download.
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
Download from Www.Somanuals.com. All Manuals Search And Download.
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
Download from Www.Somanuals.com. All Manuals Search And Download.
|
Insignia Portable DVD Player NS P9DVD15 User Manual
Jenn Air Ventilation Hood W10201609B User Manual
JVC Camcorder GR AX280 User Manual
JVC Projector Model 200 User Manual
Kalorik Scale USK EBS 37070 User Manual
Kawasaki Impact Driver 821048 User Manual
Kaz Humidifier V3900 User Manual
Keys Fitness Home Gym 835R User Manual
Keys Fitness Home Gym HT640U User Manual
KitchenAid Coffeemaker KCM222 User Manual