DOWNLOAD JBL 408 GTi Service Manual ↓ Size: 416.34 KB | Pages: 21 in PDF or view online for FREE

Model
408 GTi
Pages
21
Size
416.34 KB
Type
PDF
Document
User Manual / Operation Manual
Brand
Device
Car Audio
File
408-gti.pdf
Date

JBL 408 GTi User Manual / Operation Manual ▷ View online

408GTi  508GTi
AUTOMOTIVE NEO/KEVLAR MATCHED
COMPONENT SYSTEM WITH CAST FRAME
INSTALLATION GUIDE
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 1
Table of Contents
Welcome to Club GTi .........................................................................3
About this Manual ..............................................................................3
Autosound at its Best .........................................................................3
Designing Your System ......................................................................4
Component Placement.......................................................................5
Installation Warnings and Tips ...........................................................5
Mounting Instructions .........................................................................6
Installing the GTi System Crossover ..................................................6
Woofer/Midrange Driver Mounting .....................................................7
Mounting the 408 and 508GTi Tweeter ..............................................8
Tweeter Surface Mounting Instructions ..............................................8
Tweeter Surface Angle Mounting Instructions ....................................9
Tweeter Flush Mounting Instructions ...............................................10
Tweeter Flush Angle Mounting Instructions......................................11
Wiring ...............................................................................................12
Crossover Tweeter Level Adjustment...............................................12
System Connections ........................................................................13
Speaker Break-In .............................................................................14
A Note on Power Handling ...............................................................14
In Case of Difficulty ..........................................................................14
Specifications ...................................................................................16
Thiele-Small Specifications ..............................................................17
Mounting Templates .........................................................................19
2
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 2
Welcome to Club GTi
Thank you for purchasing the finest
Automotive Component Systems JBL has
ever produced. As a GTi Competition
Series owner, you are a member of a
select group of people who enjoy the most
advanced mobile audio products available.
We call this group “Club GTi.” By sending
in the customer information card, which
you will find attached to your warranty, we
will automatically register you as a Club
GTi member which will give you access to
exclusive Club GTi apparel and other
special offers we will make available from
time to time. We suggest you fill the card
out at your earliest convenience.
Also, be sure to save your sales
receipt in a safe place. It will be necessary
to use this document as proof of purchase
in the event that you ever need warranty
service. It is also useful for insurance
purposes and for establishing value when
you re-sell your vehicle. 
About This Manual
Because of the performance capability
of your GTi Competition Series product,
and the variety of potential system
configurations, we strongly recommend
that you have the system professionally
installed. You will also get a better warranty
if your equipment is professionally installed
by an authorized GTi dealer and you have
your warranty card stamped. This manual
provides information on installation and
usage to help a skilled technician get the
most from your GTi Competition Series
product. This manual does not cover basic
information about installation which is
common knowledge to a professional
installer, except for information which is
unique to the 408 and 508GTi systems.
If you feel you possess the necessary
skills, and prefer to install the equipment
yourself, this manual will provide you with
the necessary specifics to properly use the
408 or 508GTi in typical installations.
Consult your JBL dealer, or a qualified
technician, for more information.
Autosound at its Best
The 408 and 508GTi systems are built
to meet the same rigorous standards of
construction and performance that have
long established JBL’s renowned home
and professional speaker systems. The
408 and 508GTi Woofer/Midranges
incorporate advanced JBL woven Kevlar
cones which are especially suited to the
unique acoustic and environmental
conditions which characterize automotive
sound. The 408 and 508GTi Tweeter
incorporates advanced JBL pure titanium
technology which is especially suited to
the unique acoustic environment of
modern vehicles. The 408 and 508GTi
have been engineered to provide excellent
power handling, good dispersion and
balanced frequency response, along with
minimum size and flexible installation
options for optimizing placement within the
vehicle.
The small size of the GTi Drivers is
made possible through the use of a
Neodymium magnet assembly with JBL’s
Stray Field Containment Geometry. By
3
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 3
minimizing stray magnetic fields, this
closed circuit magnetic assembly design
concentrates the magnetic field on the
voice coil where it provides superior
performance. In the woofer/midrange
drivers, this high concentration of magnetic
power is coupled to a 2" Edge-wound
Aluminum Wire Voice Coil on a High
Temperature Fiberglass Former. This voice
coil uses lightweight aluminum wire to
maintain the agility to reproduce high
frequencies while its large diameter and
fiberglass former assures extremely high
thermal power handling.
Treated Kevlar fiber cones are used
because of their combination of low 
weight, high stiffness and resistance to
resonances. The 408 and 508GTi
Woofer/Midranges are topped off with a
treated fabric inverted dome for smooth
reproduction of upper midrange
frequencies.
The cone motion of these high
excursion designs is controlled by a
Aromatic Polyamid Fiber Spider. This new
material is able to control the 0.6" motion 
of the cone while maintaining musical
accuracy because it is 3 times stronger
than conventional spider materials.
The tweeters in the 408 and 508GTi
feature domes made from pure titanium.
Pure titanium has long been known to have
a very high stiffness to weight ratio, making
it ideal for treble reproduction. However,
only JBL has “tamed” titanium through a
special manufacturing process. The dome
of the 408 and 508GTi Tweeter is created
using special nitrogen gas cooled forming
machines which can create a uniformly
paper-thin dome without the work-
hardening or deformation which causes
resonances in domes made without benefit
of this process
Equally important is the 408 and
508GTi crossover design. Each crossover
was meticulously optimized in JBL’s state-
of-the-art acoustic laboratory to guarantee
a seamless blend of the woofer/midrange
and tweeter output. Unlike generic or
general purpose crossovers, the design of
the 408 and 508GTi Crossovers was
performed with a full knowledge of the
performance characteristics of each driver,
allowing frequency, phase, and power
response to be completely optimized for
each combination.
What does all this technology add 
up to? A system with ideal frequency
response, excellent off axis response, 
and high output capability all in a small 
and elegant package. The result is
exceptionally smooth and detailed music
reproduction over the full range of
frequencies and clean sound that cuts
through road noise.
Designing Your System
The overall quality of any system
design is a result of how well all of the
components work together, not just the
result of the performance of any one
component. JBL GTi Series woofer/
midbass or subwoofer transducers are 
the ideal companion products to your 408
and 508GTi systems. Each of the GTi
Competition Series products are designed
to complement the others to provide the
highest performance with the simplest and
most predictable system design. To use the
408 and 508GTi as the woofer/midrange
4
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 4
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JBL 408 GTi User Manual / Operation Manual ▷ Download

  • DOWNLOAD JBL 408 GTi Service Manual ↓ Size: 416.34 KB | Pages: 21 in PDF or view online for FREE
  • Here you can View online or download the User Manual / Operation Manual for the JBL 408 GTi in PDF for free, which will help you to disassemble, recover, fix and repair JBL 408 GTi Car Audio. Information contained in JBL 408 GTi 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.