JBL GT1000 User Manual

®
GRAND TOURING SERIES  
Automotive Subwoofers  
GT800, GT800d, GT1000, GT1000d, GT1200, GT1200d, GT1500, GT1500d Owner’s Manual  
GENUINE JBL  
Specifications  
GT Speakers  
Specifications:  
GT800  
GT800d  
GT1000  
GT1000d  
Configuration  
8" woofer  
8" woofer,  
dual voice coil  
10" woofer  
10" woofer,  
dual voice coil  
Recommended power amplifier range  
Sensitivity (@ 2.83 volt/1 meter)  
Frequency response  
18W – 200W  
93dB  
18W – 200W  
93dB  
18W – 260W  
94dB  
18W – 260W  
94dB  
35Hz – 5kHz  
35Hz – 5kHz  
30Hz – 3.5kHz  
30Hz – 3.5kHz  
Mounting Depth  
Top mount  
Bottom mount  
3-13/16" (97mm)  
4-5/16" (110mm)  
3-13/16" (97mm)  
4-5/16" (110mm)  
5-1/8" (131mm)  
5-5/8" (143mm)  
5-1/8" (131mm)  
5-5/8" (143mm)  
Dimensions  
Cut-out diameter  
7-1/8" (181mm)  
7-1/8" (181mm)  
9-1/4" (235mm)  
9-1/4" (235mm)  
Specifications:  
GT1200  
GT1200d  
GT1500  
GT1500d  
Configuration  
12" woofer  
12" woofer,  
dual voice coil  
15" woofer  
15" woofer,  
dual voice coil  
Recommended power amplifier range  
Sensitivity (@ 2.83 volt/1 meter)  
Frequency response  
18W – 280W  
95dB  
18W – 280W  
95dB  
18W – 300W  
97dB  
18W – 300W  
97dB  
25Hz – 3kHz  
25Hz – 3kHz  
20Hz – 2kHz  
20Hz – 2kHz  
Mounting Depth  
Top mount 3-3/8" (86mm)  
Bottom mount  
5-3/4" (147mm)  
6-1/4" (159mm)  
5-3/4" (147mm)  
6-1/4" (159mm)  
6-11/16" (170mm)  
7-3/16" (183mm)  
6-11/16" (170mm)  
7-3/16" (183mm)  
Dimensions  
Cut-out diameter  
11-1/8" (283mm)  
11-1/8" (283mm)  
13-15/16" (355mm)  
13-15/16" (355mm)  
01  
Sealed enclosures exert the most  
control over the motion of a sub-  
woofer because the air acts like  
a spring against the motion of  
the woofer cone. Larger boxes  
allow for more excursion (cone  
movement), thus more low-  
adequate woofer control when dri-  
ven below the port tuning range,  
so proper design is important. A  
fourth-order bandpass box will  
have the lowest overall cone  
excursion at the expense of limited  
bandwidth.  
2. Seal all joints with glue and  
screws; do not use nails. We  
recommend “deck” or “zip” screws  
since they have coarse threads  
for better grip and don’t require  
pre-drilling holes. Once the box  
has been tested, seal all interior  
joints with silicone caulk.  
(i.e., entire box is stuffed with  
frequency output for the amount  
of power used. When placed in a  
sealed box larger than the com-  
pliance (Vas) of the subwoofer, it  
will perform as if it were in an  
infinite baffle installation.  
loosely-packed polyester fiberfill).  
In addition, there are a number of  
points you’ll want to keep in mind  
as you construct an enclosure:  
4. Use PVC or ABS pipe for ports.  
Keep in mind that the openings at  
either end of the port must be at  
least one port diameter away  
from any obstructions, including  
filling material inside or outside  
the box. Rectangular vents can  
be used as long as the cross-  
section area matches the  
3. Depending on the application,  
fill the enclosure according to the  
design you have chosen from the  
enclosed data sheet in one of three  
ways: zero-percent fill (i.e., no  
fill), or 50-percent fill (i.e., 1"-  
thick polyfill sheets on all inside  
walls except where subwoofer is  
mounted), or 100-percent fill  
1. Use 3/4" (19mm) MDF (medium-  
density fiberboard) or marine  
birch plywood to build an enclosure.  
Enclosures for 12" and larger  
subwoofers, or small subwoofers  
driven by high-power amplifiers,  
should be constructed using 1"  
(25mm) material.  
Vented and bandpass enclosures  
have the lowest amount of excur-  
sion for the amount of sound out-  
put. This is a result of port tuning  
reinforcing the sound output.  
recommended port-area values  
in the enclosed data sheet.  
Vented boxes will not provide  
01  
Power-Handling  
Limitations  
The power-handling capability of  
any woofer is related to both its  
ability to dissipate heat and the  
maximum excursion limits of its  
cone. Once the speaker’s voice  
coil moves outside the magnetic  
gap, power can no longer be con-  
verted into motion, and all the  
amplifier’s power is converted  
into heat in the voice coil. This  
voice-coil heating is the largest  
detriment to speaker longevity,  
so overexcursion (driving the  
speaker past Xmax) should be  
avoided. Since speaker-cone  
excursion is different for each  
type of enclosure, power handling  
is different for each enclosure.  
• Voice-coil overheating and burn-  
ing due to over-excursion is often  
caused by overdriving an ampli-  
fier into “clipping.” A severely  
clipped signal, or squarewave,  
contains nearly twice the power  
of a clean sine wave at the same  
level. Bass that sounds broken up  
and distorted at higher volumes  
usually indicates that the ampli-  
fier is being asked to deliver  
subwoofer will likely be half its  
rated power in this application.  
• Study the excursion curves on  
the enclosed GT Series data  
sheet and note the differences  
for different enclosure applica-  
tions. The type and size of box  
used will produce different excur-  
sion demands on the enclosed  
subwoofer and, consequently,  
different levels of power han-  
dling. As long as recommended  
parameters are used, the sub-  
woofer will perform properly in  
its enclosed environment.  
However, any design deviation  
may result in less than optimum  
performance, and may also  
subject the subwoofer to over-  
excursion that can eventually  
damage the speaker. For  
additional help with this issue,  
please contact your authorized  
JBL dealer.  
power beyond its ability.  
• Infinite baffle or “free air”  
mounting applications allow for  
greater cone excursion than sub-  
woofers mounted in an enclosure.  
In order to compensate, recognize  
that the power-rating value of the  
Declaration of Conformity  
We, JBL Europe A/S  
Kongevejen 194B  
DK-3460 Birkerød  
DENMARK  
declare in own responsibility, that the products described  
in this owner’s manual are in compliance with technical  
standards:  
EN 50 081-1/1992  
EN 50 082-1/3.1995  
Steen Michaelsen  
JBL Europe A/S  
Birkerød. DENMARK. 2/98  
JBL Consumer Products  
250 Crossways Park Drive  
Woodbury, NY 11797  
8500 Balboa Blvd.  
Northridge, CA 91329  
800-336-4JBL (4525)  
Part No. GTAUTOSUBOM  
Made in USA  

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