GT 1500 (serv.man2) - JBL Car Audio User Guide / Operation Manual

gt 1500 (serv.man2) user guide / operation manual
GT 1500 (serv.man2)
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User Guide / Operation Manual
Car Audio

Read JBL GT 1500 (serv.man2) User Guide / Operation Manual online

G E N U I N E   J B L
A u t o m o t i v e   S u b w o o f e r s
GT 8 0 0 ,   GT 8 0 0 d ,   GT10 0 0 ,   GT10 0 0 d ,   GT12 0 0 ,   GT12 0 0 d ,   GT15 0 0 ,   GT15 0 0 d   O w n e r ’ s   M a n ua l
GTSubwoofers Owner's Manual  7/14/98 2:19 PM  Page 1
installation methods for your par-
ticular vehicle. If you do not feel
you have experience, do not
attempt the installation yourself,
but instead ask your authorized
JBL dealer about professional
installation options.
Remember to keep your sales
receipt with this manual in a safe
place so both are available for
future reference.
Thank you
for choosing a
JBL GT Series subwoofer. GT
Series subwoofers are designed
to suit a broad range of mobile
audio applications and can be
used in a wide variety of enclo-
sure types to produce extended,
powerful bass in a limited
amount of vehicle space. To
ensure maximum subwoofer
performance, we strongly rec-
ommend that installation be left
to a qualified professional.
Although these instructions
explain how to install a GT
Series subwoofer in a general
sense, they do not show box con-
struction details and exact
Enclosure Calculations
and Building Boxes
Use the recommended box
designs on the enclosed data
sheet or look for them on our
Web site at Choose
cabinet dimensions to fit your
vehicle, but do not change the
enclosure’s volume. Doing so will
change the tuning frequency of
the enclosure and may adversely
affect final performance. If you
cannot perform the necessary
calculations yourself, please con-
tact your authorized JBL dealer
for help and information about
JBL Speakershop™, a dedicated
enclosure-design software pro-
gram for experienced car-audio
Your Car and Bass
Depending on the size of the vehi-
cle’s interior listening space,
reproduced bass frequencies
below 80Hz are actually boosted
by nearly 12dB per octave as fre-
quency decreases. NOTE: This
effect, known as the vehicle’s
transfer function, plays an impor-
tant part in shaping the overall
in-car response and is displayed
graphically along with freespace
response on the enclosed data
sheet for your GT Subwoofer.
GTSubwoofers Owner's Manual  7/14/98 2:19 PM  Page 2
GT Speakers
8" woofer
8" woofer, 
10" woofer
10" woofer,
dual voice coil
dual voice coil
Recommended power amplifier range
18W – 200W
18W – 200W
18W – 260W
18W – 260W
Sensitivity (@ 2.83 volt/1 meter)
Frequency response
35Hz – 5kHz
35Hz – 5kHz
30Hz – 3.5kHz
30Hz – 3.5kHz
Mounting Depth
Top mount
3-13/16" (97mm)
3-13/16" (97mm)
5-1/8" (131mm)
5-1/8" (131mm)
Bottom mount
4-5/16" (110mm)
4-5/16" (110mm)
5-5/8" (143mm)
5-5/8" (143mm)
Cut-out diameter
7-1/8" (181mm)
7-1/8" (181mm)
9-1/4" (235mm)
9-1/4" (235mm)
12" woofer
12" woofer,
15" woofer
15" woofer,
dual voice coil
dual voice coil
Recommended power amplifier range
18W – 280W
18W – 280W
18W – 300W
18W – 300W
Sensitivity (@ 2.83 volt/1 meter)
Frequency response
25Hz – 3kHz
25Hz – 3kHz
20Hz – 2kHz
20Hz – 2kHz
Mounting Depth
Top mount 3-3/8" (86mm)
5-3/4" (147mm)
5-3/4" (147mm)
6-11/16" (170mm)
6-11/16" (170mm)
Bottom mount
6-1/4"  (159mm)
6-1/4" (159mm)
7-3/16" (183mm)
7-3/16" (183mm)
Cut-out diameter
11-1/8" (283mm)
11-1/8" (283mm)
13-15/16" (355mm)
13-15/16" (355mm)
GTSubwoofers Owner's Manual  7/14/98 2:19 PM  Page 3
(i.e., entire box is stuffed with
loosely-packed polyester fiberfill).
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 
recommended port-area values 
in the enclosed data sheet. 
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.
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 
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-
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.
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.
Vented boxes will not provide
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
In addition, there are a number of
points you’ll want to keep in mind
as you construct an enclosure:
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.
GTSubwoofers Owner's Manual  7/14/98 2:19 PM  Page 4
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Here you can read online and download JBL GT 1500 (serv.man2) User Guide / Operation Manual in PDF. GT 1500 (serv.man2) user guide / operation manual will guide through the process and help you recover, restore, fix, disassemble and repair JBL GT 1500 (serv.man2) Car Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.