JBL Car Speaker 508GTI User Manual

408GTi 508GTi  
AUTOMOTIVE NEO/KEVLAR MATCHED  
COMPONENT SYSTEM WITH CAST FRAME  
INSTALLATION GUIDE  
 
Welcome to Club GTi  
About This Manual  
Autosound at its Best  
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  
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  
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  
advanced mobile audio products available. installed. You will also get a better warranty  
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.  
if your equipment is professionally installed incorporate advanced JBL woven Kevlar  
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  
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  
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.  
the necessary specifics to properly use the vehicle.  
408 or 508GTi in typical installations.  
Consult your JBL dealer, or a qualified  
technician, for more information.  
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
 
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  
accuracy because it is 3 times stronger  
than conventional spider materials.  
The tweeters in the 408 and 508GTi  
feature domes made from pure titanium.  
response to be completely optimized for  
each combination.  
What does all this technology add  
up to? A system with ideal frequency  
Pure titanium has long been known to have response, excellent off axis response,  
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-  
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  
hardening or deformation which causes  
resonances in domes made without benefit  
of this process  
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  
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  
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  
4
 
and high frequency transducers in a high  
quality system, we recommend you use  
either a high quality active crossover  
such as JBL’s GTX47, GTX4 or GTX2  
to provide optimum matching to your  
subwoofer or woofer/midbass loudspeaker.  
If you prefer passive crossovers, we  
recommend that you use only high quality  
audiophile grade film-type capacitors  
and Low DCR inductors to get the most  
out of your system. The most popular  
system configuration is a hybrid using  
an active crossover for the subwoofer to  
woofer/midrange crossover point, and a  
passive crossover for the woofer/midrange  
to tweeter crossover. Your GTi Competition  
Series Dealer is uniquely qualified to help  
guide you on the best system configuration  
for your needs.  
smooth dispersion pattern, excellent  
performance may be achieved in any  
vehicle. Due to the wide variety of vehicles,  
there is not one “right” way to locate the  
408 and 508GTi, however knowledge of  
the following considerations will help you  
get the most from your system:  
1. The most spacious stereo image is  
achieved when the speakers are placed  
as wide apart as possible.  
2. The best center image will be achieved  
when the distance from the left speaker  
to your left ear is as equal as possible to  
the distance from the right speaker to  
your right ear. This is most easily  
5. Because of the high acoustic energy  
capability of the 408 and 508GTi, the  
woofer/midrange drivers must be  
securely mounted in a rigid panel which  
is free from resonances, rattles and air  
leakage.  
Installation Warnings and Tips  
Be careful not to cut or drill into fuel  
tanks, fuel lines, brake or hydraulic  
lines, vacuum lines or electrical wiring  
when working on your vehicle. Inspect  
behind panels before you cut or drill.  
Be sure to check for clearance of  
window, cranks and linkages when  
mounting speakers in door panels.  
Do not use the speakers unmounted.  
Failure to securely mount this product  
could result in damage or injury,  
particularly in the event of an accident.  
Although the materials used on the 408  
and 508GTi are inherently water  
resistant, do not mount the speakers  
where they will get wet.  
achieved by placing the 408 or  
508GTi as far forward as you can.  
3. The best system integration is achieved  
when the woofer/midrange is mounted  
close to the tweeter. Installing the  
tweeter close to the woofer/midrange  
helps smooth the transition from  
woofer/midrange to tweeter at the  
crossover point.  
4. You will get the best frequency  
response when the path from the  
speakers to your ear is unobstructed.  
Component Placement  
The location of each of the  
loudspeakers plays a vital role in achieving  
proper frequency response and spacious  
imaging. Because the 408 and 508GTi  
systems have an extremely wide and  
Always disconnect the ground wire  
from the battery before doing any work  
on the vehicle.  
5
 
2. Remove the crossover board from the  
plastic case.  
3. Use wire ties to secure the plastic case  
to the desired location as shown in  
Figure A.  
4. Cut off the excess plastic on the wire ties.  
5. Re-install the PCB and install wiring  
from the crossover to the amplifier  
and speaker locations as shown in  
Figure K.  
3. Mark 4 hole locations, drill holes and  
secure the bottom cover to the desired  
mounting location as shown in Figure B.  
Before starting make sure no electrical  
or other critical car components are  
located where you will be drilling.  
4. Re-install the PCB and install wiring  
from the crossover to the amplifier  
and speaker locations as shown in  
Figure K.  
Mounting Instructions  
Pick a mounting location after reading  
the recommendations in the Component  
Placement section of this manual.  
Installing the GTi System  
Crossover  
The GTi system crossover should be  
mounted securely to prevent damage to  
the crossover or possible loosening of  
wiring connections. Choose one of the  
crossover mounting methods and follow  
the directions below:  
6. Re-install the crossover cover.  
5. Re-install the crossover cover.  
Note: Do not mount the GTi Crossover in a  
location where it can get wet, as this  
may cause damage to its components.  
MOUNTING RING  
ADAPTER  
Figure B  
Mounting the GTi Crossover with Screws  
1. Remove the crossover cover as  
shown in Figure L.  
2. Remove the crossover board from the  
plastic case.  
Figure A  
Figure C  
Mounting the GTi Crossover with Wire Ties  
1. Remove the crossover cover as shown  
in Figure L.  
WOOFER/  
MIDRANGE  
6
 
Mounting the Woofer/Midrange in  
Custom Locations  
2. Cut out the speaker hole at the  
Woofer/Midrange Driver  
Mounting  
mounting location and drill the three  
1
8
marked holes with a / " (3mm) drill.  
Mounting the Woofer/Midrange to  
Stock Hole Locations  
1. Access the stock speaker location and  
remove the stock speaker. The 408  
and 508GTi include mounting ring  
3. Run speaker wire to the hole location,  
making sure that either an active or  
the included passive crossover is  
connected to the speaker (see Figure K  
for wiring details).  
4. Put the speaker Fabric Displacement  
Ring under the speaker as shown in  
Figure D.  
5. Attach the foam gasket to the back of the  
woofer/midrange. Connect the speaker  
wire from the crossover terminals marked  
“ W” to the speaker by either soldering  
(preferred) or using crimp terminals.  
Connect the wire from the W+” terminal  
on the crossover to the red W” terminal  
on the woofer/ midrange. Repeat the  
same process for the W–” terminal (see  
Figure K for details).  
WOOFER/  
MIDRANGE  
adapters which allow the speaker to  
be mounted in standard 4" and 5 / "  
holes respectively.  
1
4
FABRIC  
DISPLACEMENT  
RING  
2. Attach the mounting ring adapter to  
1
4
the stock location using four #8 x 1 / "  
screws as shown in Figure C.  
3. Attach the foam gasket to the back of the  
woofer/midrange. Connect the speaker  
wire from the crossover terminals marked  
“W” to the speaker by either soldering  
(preferred) or using crimp terminals.  
Connect the wire from the W+” terminal  
on the crossover to the red W” terminal  
on the woofer/midrange. Repeat the  
same process for the W–” terminal (see  
Figure K for details).  
Figure D  
1. Snap the grille assembly of the speaker  
onto the driver and choose three hole  
locations so that the grille logo is oriented  
as desired for your installation. Use the  
Fabric Displacement Ring included in the  
package to mark the location of the three  
screw holes and the speaker cutout  
holes (cutout hole sizes are listed in the  
Specifications section). Before cutting or  
drilling make sure that there are no car  
components, electrical wiring or any  
other items that could be damaged.  
6. Mount the speaker to the hole location  
1
4
using three #8 x 1 / " screws and three  
shoulder washers as shown in Figure D.  
7. Push the grille down onto the speaker  
making sure the tabs on the speaker  
4. Mount the woofer/midrange driver to  
5
8
the adapter ring using three #8 x / "  
screws and three shoulder washers  
as shown in Figure C.  
match with the slots in the grille. Twist  
1
2
the grille about / " (12mm) clockwise to  
5. Replace the stock speaker panels.  
lock the grille into place.  
7
 
Logo Orientation on Grille  
mounting screws to secure the mounting  
plate in place as shown in Figure F.  
GRILLE  
FRAME  
The orientation of the logo on the  
metal grille relative to the grille frame can  
be adjusted. Simply remove the metal  
grille and reassemble the metal grille to  
the grille frame utilizing a different tab slot.  
b) Run wire from the 408 and 508GTi  
Crossover to the wire feed-through hole  
and connect the wire to the tweeter  
making sure to connect + to + and – to –  
by either soldering (preferred) or using  
crimp-on connectors.  
Mounting the  
408 and 508GTi Tweeter  
c) Push the tweeter down onto the  
mounting plate making sure to line up the  
bayonet tabs with the slots in the tweeter  
housing.  
METAL  
GRILLE  
The 408 and 508GTi Tweeter includes  
accessories for four different mounting  
configurations. Take a look at all the  
possibilities described in the following  
paragraphs, pick one, follow the steps and  
you’ll soon be done!  
Figure E  
d) Twist the tweeter clockwise about 14" to  
lock it into position.  
Note: The metal grille is designed so  
that it can be covered with grille cloth if  
desired. Simply, remove the metal grille  
from the grille frame as shown in Figure E.  
Then use spray adhesive to glue and wrap  
the grille cloth to the metal grille. Push the  
metal grille with cloth back in the grille  
frame. For even better interior matching it  
is also possible to use plastic compatible  
paint to match the grille frame to the  
vehicle’s interior.  
C
Tweeter Surface Mounting  
Instructions  
B
a) Using the Mounting Plate Template at  
the back of this manual. Pick a mounting  
location for the tweeter making sure that  
speaker wire can be run to this location.  
Flat surfaces work best. Drill the holes as  
shown on the template in the desired  
A
Figure F  
mounting location. Use three 3⁄  
4"  
TWEETER SURFACE MOUNT INSTALLATION  
8
 
Tweeter Surface Angle Mounting  
Instructions  
D
A
C
a) Using the Surface Angle Mount  
Template at the back of the manual, drill  
two screw holes at the desired mounting  
location, making sure to choose the  
correct tweeter orientation. Secure the  
Surface Angle Mount Adapter with two 3⁄  
4
"
B
sheet metal screws as shown in Figure G.  
b) Secure the mounting plate to surface  
angle mount adapter using two 516" screws.  
c) Run the speaker wire from the 408 and  
508GTi Crossover to the wire through hole  
and connect the wire to the tweeter  
making sure to connect + to + and – to –  
by either soldering (preferred) or using  
crimp-on connectors.  
Figure G  
TWEETER SURFACE ANGLE INSTALLATION  
d) Push the tweeter down onto the  
mounting plate making sure to line up the  
bayonet tabs with the slots in the tweeter  
housing.  
e) Twist the tweeter clockwise about 14" to  
lock it into position.  
9
 
3
4
c) Tighten the larger ⁄ " spring mounting  
screw to lock the Flush Mounting Cup into  
the mounting hole.  
Tweeter Flush Mounting  
Instructions  
a) Use a hole saw or other tool and the  
Flush Mount Template at the back of this  
manual to make a hole for the flush mount  
cup in the desired location. Secure the  
metal spring to the Flush Mount Cup  
using one metal spring screw as shown  
in Figure H. Tighten the screw only enough  
to keep the metal spring from falling off.  
E
d) Secure the mounting plate to the Flush  
5
16  
Mount Cup using three ⁄ " screws.  
Connect the speaker wire from the  
crossover to the tweeter (see Figures I  
and K), making sure to observe correct  
polarity.  
F
D
Figure I  
e) Push the tweeter down onto the  
mounting plate making sure to line up the  
bayonet tabs with the slots in the tweeter  
housing.  
b) Push the Flush Mount Cup with the  
metal spring into the hole that was cut in  
step a.  
TWEETER FLUSH MOUNT  
INSTALLATION  
1
4
f) Twist the tweeter clockwise about ⁄ " to  
lock it into position.  
Flush Mount Cup  
A
B
C
Figure H  
FLUSH MOUNT INSTALLATION  
10  
 
Tweeter Flush Angle Mounting  
Instructions  
E
D
a) Follow steps a through c in the Tweeter  
Flush Mounting Instructions.  
b) Secure the Flush Angle Mount Adapter  
5
16  
to the Flush Mount Cup using two ⁄ "  
screws as shown in Figure J.  
c) Connect the 408 and 508GTi speaker  
wires (from the crossover) to the tweeter,  
observing correct polarity (see figure K for  
details).  
d) Press the tweeter down onto the Flush  
Angle Mount Adapter lower portion, making  
sure to line up the snaps with the slots in  
the tweeter housing.  
Figure J  
e) Snap the other portion of the tweeter  
down onto the angle adapter.  
TWEETER FLUSH ANGLE  
INSTALLATION  
11  
 
The polarity (the positive / negative  
orientation of the connections) for every  
speaker and crossover to amplifier  
Wiring  
Crossover Tweeter Level  
Adjustment  
Use 2-conductor stranded type,  
insulated wire to connect the 408 and  
508GTi Woofer/Midrange and tweeter to  
the included crossover, and the crossover  
to the amplifier as shown in Figure K.  
A minimum wire gauge of 18AWG is  
recommended, with larger size suggested  
for wire runs longer than 10 feet.  
The Gti System Crossover allows you  
to adjust the level of the GTi Systems  
Tweeter. This adjustment is located under  
the crossover cover. To remove this cover  
simply press on the end of the cover  
(as shown in Figure L) and lift off. The  
adjustment of the tweeter level is done by  
setting the switch on the crossover (see  
Figure M) to the “0dB,” “–2dB” or “–4dB”  
position. Set this switch in the position that  
matches your personal preference. Both  
crossovers should have this switch set in  
the same position.  
connection must be consistent from left to  
right channel to assure proper imaging and  
optimum frequency response. This does not  
mean that the woofer/midrange should  
always be connected in the same polarity  
as the tweeter however. It is possible, that  
due to the difference in the distance the  
sound travels from the woofer/midrange to  
your ears compared to the distance from the  
tweeters in a typical system, and the short  
wavelengths of sound at the crossover  
frequency, that a connection where the  
tweeters are connected in reverse polarity  
from the woofer/midrange drivers may  
actually result in better sound. Because  
there is no way to accurately predict this  
before installation, we recommend that you  
try the connection both ways, and leave it in  
the polarity that gives the smoothest audible  
transition between the woofer/midrange and  
tweeter. When the tweeter and woofer/  
midrange drivers are mounted close to  
each other, the in-phase connection will  
usually yield the best sound.  
TWEETER WOOFER  
INPUT  
BLACK  
(–)  
RED  
(+)  
508 GTI Crossover  
Connect to  
White “W”  
Terminal  
LIFT  
PRESS  
Connect to  
Red “W”  
Terminal  
Figure K  
Figure L  
12  
 
OdB  
–2dB  
–4dB  
use may be obtained at slightly lower  
power handling levels.  
louder. Since no crossover is perfect, it is  
advisable to keep your crossover points  
away from the range where your hearing is  
most sensitive. Therefore we recommend  
that you try to keep the high-pass  
frequency below 250Hz. This lets the 408  
or 508GTi reproduce the entire range of  
frequencies covering the most important  
vocal and lead instrument fundamentals  
and their harmonics.  
Tweeter Level Adjustment Switch  
For the best performance, we  
recommend that an active crossover with  
a minimum of 12dB per octave slope be  
used for the transition point between the  
Subwoofer and the 408 or 508GTi. The  
optimum crossover frequency for this  
transition is dependent on the specific  
components used, the vehicle, and other  
installation details. As a general rule, the  
crossover frequency should be as low as  
possible to achieve the best system  
imaging. You can fine-tune the crossover  
after the installation is complete for the  
best sound. A good place to start your  
tuning process is between 60Hz and  
150Hz when using the 508GTi and  
between 80Hz and 150Hz when using the  
408GTi. In 4-way systems using a midbass  
driver such as the 600GTi, the crossover  
point may be raised higher without  
detrimentally affecting imaging as long  
as the woofer/midbass drivers can  
be mounted reasonably close to the  
woofer/midranges. This higher crossover  
frequency will allow the system to play  
Figure M  
If you prefer to use all passive  
System Connections  
crossovers, you will need to construct  
or purchase a high-pass filter for the  
subwoofer to woofer/midrange transition  
point and install it in-line ahead of the 408  
or 508GTi Crossover. For the best system  
dynamic range, we recommend that a  
minimum slope of 12dB per octave be  
used.  
The most advanced system designs  
use active electronic crossovers such as  
the JBL GTX2, GTX4 or GTX47 at both  
the subwoofer (or woofer/midbass)-to-  
woofer/midrange transition point and at the  
woofer/midrange-to-tweeter transition. Set  
the high crossover frequency at or above  
5kHz if a 12dB per octave crossover is  
There are a variety of system options  
available with the 408 and 508GTi. The  
simplest configuration is to use the 408  
and 508GTi full range. Although this will  
yield good sound, the best performance  
will be achieved in a high-end system  
which includes subwoofers and, optionally,  
midbass transducers. Because the 408  
and 508GTi are specifically designed  
for mid and high frequency operation,  
they should have their extremely low  
frequencies blocked by electrical means in  
order to achieve the best system fidelity  
and the widest dynamic range. Full range  
13  
 
used and at or above 3.5kHz if you are  
using an 18 or 24dB per octave crossover.  
In this configuration, the crossovers  
supplied with the 408 and 508GTi are  
not used. For tweeter protection, a 1.5A  
fast acting fuse should be installed in  
series with the tweeter. The maximum  
recommended RMS amplifier power  
routed directly to the woofer/midrange is  
150 watts for the 408GTi and 200 watts for  
the 508GTi. The maximum recommended  
RMS amplifier power routed directly to the  
tweeter is 125 watts.  
JBL loudspeakers will produce reasonable  
volume levels in the automotive environment ensure that the amplifier will not attempt to  
speaker. This margin of reserve power will  
using very little amplifier power. However,  
the use of a low-powered amplifier to attain  
very high volume levels could lead to  
overdriving the amplifier. This will generate  
high distortion levels which can easily  
damage loudspeakers, even if the rated  
power of the amplifier is below the rated  
maximum power handling of the  
deliver more power than its design allows.  
Your dealer will be happy to point out  
which high power JBL amplifiers are  
optimum for your application and listening  
habits.  
Following these guidelines will provide  
virtually distortion free sound reproduction  
and long loudspeaker life.  
loudspeaker!  
As a general rule, do not turn up the  
volume control past the point where you  
hear distortion in the form of either signal  
distortion from an overdriven amplifier or  
mechanical noise from an overstressed  
speaker. For the best performance and  
system reliability, you should select an  
amplifier with an output rating greater than  
the maximum power likely to be used to  
generate the desired volume levels. If you  
want your system “Loud + Clear,” we  
suggest that you step up to a JBL power  
amplifier which has an RMS power rating  
equal to, but not exceeding, the Maximum  
Recommended Amplifier Power listed in  
the specifications of your specific JBL  
In Case of Difficulty  
The most common difficulties are  
noise, distortion, and intermittent  
connections.  
Speaker Break-In  
The 408 and 508GTi Woofer/  
Midranges use many high strength  
System noise is usually not the fault  
of the 408 and 508GTi. Hiss or “alternator  
whine” is most often the result of faulty  
grounding of the system electronics or  
improper setting of amplifier level controls.  
An exception to this is if the passive  
crossover networks are mounted near a  
source of radiated noise, the network may  
pick up this noise with sufficient power to  
drive the 408 and 508GTi. For this reason,  
be careful not to mount any passive  
materials which require a break-in period  
before they will achieve top performance.  
The drivers need to be broken in at a  
medium volume level for about 1 hour  
before maximum performance is achieved.  
A Note on Power Handling  
As a result of their high efficiency, all  
14  
 
crossovers near wires carrying high  
currents such as battery cables or wires  
leading to ammeters or tachometers.  
Distortion is usually the result of  
overdriving one or more components in  
the system. The problem is most likely  
insufficient amplifier power, or improper  
setting of gain controls. Refer to the  
instructions which came with the  
electronics for assistance. The 408 and  
508GTi will not play as loudly, or handle  
the full rated power, when used without a  
subwoofer and associated high-pass  
crossover. When using the 408 or  
508GTi full-range, be careful to limit the  
volume level to that which can be  
reproduced without audible distortion  
from the speaker.  
If you want to talk to us about any  
problems, call JBL Customer Service at  
1-800-336-4JBL (4525) between 9AM  
and 5PM eastern time.  
15  
 
Specifications:  
408GTi  
508GTi  
Frequency response:  
8022kHz  
6022kHz  
Recommended minimum High-Pass Crossover  
Frequency for Medium Power Operation:  
80Hz  
60Hz  
Continuous Power Handling With 12dB  
Passive Network High Passed at  
Recommended Minimum Frequency:  
100 Watts  
150 Watts  
150 Watts  
200 Watts  
Continuous Power Handling with 12dB Passive  
Network High Passed at 150–200Hz  
(Midrange Operation):  
Continuous Power Handling When Used  
Without High-Pass (Full-Range Operation):  
75 Watts  
20 Watts  
150 Watts  
89dB  
100 Watts  
20 Watts  
200 Watts  
91dB  
Minimum Recommended Amplifier Power:  
Maximum Recommended Amplifier Power Rating:  
Sensitivity (2.83 Volts / 1 Meter):  
Impedance  
4 Ohms  
4 Ohms  
Dimensions – Woofer/Midrange Transducers  
Overall Maximum Diameter  
(Mounting Tab to Frame Edge):  
Height:  
43/8" (111mm)  
218" (54mm)  
178" (48mm)  
334" (95mm)  
518" (130mm)  
238" (60mm)  
2116" (53mm)  
434" (121mm)  
Mounting Depth:  
Cutout Size:  
Dimensions – Tweeter  
Overall Diameter:  
1
1516" (50mm)  
11516" (50mm)  
Height:  
1116" (18mm)  
1116" (18mm)  
Height With Angle Adapter:  
Flush Mount Cutout Diameter:  
Flush Mount Depth:  
112" (38mm)  
218" (54mm)  
1516" (23mm)  
112" (38mm)  
218" (54mm)  
1516" (23mm)  
Dimensions – Crossover Network (LxWxH):  
510/16" x 33/16" x19/16"  
(143mm x 81mm x 40mm)  
1 lb. 7 oz. (0.66kg)  
2.5 oz. (71 grams)  
510/16" x 33/16" x 19/16"  
(143mm x 81mm x 40mm)  
1 lb. 10 oz. (0.75kg)  
2.5 oz. (71 grams)  
Woofer/Midrange Weight:  
Tweeter Weight:  
16  
 
Thiele-Small Specifications:  
Free Air Resonance (Fs):  
Electrical Damping (Qes):  
Mechanical Damping (Qms):  
Total Damping (Qt):  
408 GTi  
508 GTi  
125Hz  
100Hz  
0.52  
0.51  
5.17  
5.14  
0.47  
0.4  
Equivalent Volume of Compilance (Vas):  
Effective Cone Area (Sd):  
Center to Peak Linear Excursion (Xmax):  
Voice Coil DC Resistance (Re):  
Voice Coil Inductance (Le):  
Voice Coil Diameter:  
0.0388 cu. ft. (1.10 liters)  
9.3 sq. inches (0.0060 m2)  
0.126 inches (3.2mm)  
3.4 ohms  
0.1059 cu. ft. (3.0 liters)  
14.26 sq. inches (0.0092 m2)  
0.126 inches (3.2mm)  
3.4 ohms  
0.22mH @ 1kHz  
2 inches (51mm)  
0.400 inches (10.2mm)  
0.200 inches (5.1mm)  
6.2 T/M  
0.22mH @ 1kHz  
2 inches (51mm)  
0.400 inches (10.2mm)  
0.200 inches (5.1mm)  
6.2 T/M  
Voice Coil Length (Winding Length):  
Air Gap Height:  
BL Product:  
Effective Moving Mass (Mm):  
0.28 oz. (8.0 grams)  
0.32 oz. (9.0 grams)  
Note: The Thiele-Small specifications shown apply only after a break-in period of approximately 2 hours.  
JBL continually strives to impove its products. New materials, production methods and other refinements may result in a change from published  
specifications and description. The changes will equal or exceed the original specifications, unless otherwise stated.  
17  
 
11  
Drill /32" (8.7mm)  
holes for wire feed through  
Drill 3/32" (2.9mm)  
hole in two places  
TWEETER  
SURFACE  
ANGLE  
MOUNT  
TEMPLATE  
Tweeter is angled  
in this direction  
19  
 
11  
Drill /32" (8.7mm)  
holes for  
wire feed through  
TWEETER  
MOUNTING  
PLATE  
TEMPLATE  
3
Drill /32" (2.4mm)  
holes for  
mounting screw  
21  
 
Cut Hole Using  
21/8-21/4" (54mm)  
hole saw  
TWEETER FLUSH  
MOUNT TEMPLATE  
23  
 
JBL Consumer Products, Inc.  
80 Crossways Park West  
Woodbury, NY 11797  
8500 Balboa Blvd.  
Northridge, CA 91329  
1-800-336-4JBL  
A Harman International Company  
NMGP/N:306385-001  
5/94  
 

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