DOWNLOAD JBL GT 800 Service Manual ↓ Size: 123.84 KB | Pages: 6 in PDF or view online for FREE

Model
GT 800
Pages
6
Size
123.84 KB
Type
PDF
Document
User Manual / Operation Manual
Brand
Device
Car Audio
File
gt-800.pdf
Date

JBL GT 800 User Manual / Operation Manual ▷ View online

GRAND TOURING
®
SERIES 
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
01
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 www.jbl.com. 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
enthusiasts.
Your Car and Bass
Reproduction
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
Specifications
GT Speakers
Specifications:
GT800
GT800d
GT1000
GT1000d
Configuration
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)
93dB
93dB
94dB
94dB
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)
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,
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)
95dB
95dB
97dB
97dB
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)
Dimensions
Cut-out diameter
11-1/8" (283mm)
11-1/8" (283mm)
13-15/16" (355mm)
13-15/16" (355mm)
01
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
bandwidth.
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.
01
GTSubwoofers Owner's Manual  7/14/98 2:19 PM  Page 4
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JBL GT 800 User Manual / Operation Manual ▷ Download

  • DOWNLOAD JBL GT 800 Service Manual ↓ Size: 123.84 KB | Pages: 6 in PDF or view online for FREE
  • Here you can View online or download the User Manual / Operation Manual for the JBL GT 800 in PDF for free, which will help you to disassemble, recover, fix and repair JBL GT 800 Car Audio. Information contained in JBL GT 800 User Manual / Operation Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.