INSTALLATION WARNINGS AND TIPS
ABOUT THESE 
INSTRUCTIONS
Installation of automotive stereo components can require extensive experience with a variety of mechanical and 
electrical procedures. Although these 
instructions explain how to install 
Grand Touring Series component systems in a general sense, they do not 
show the exact installation methods 
for your particular vehicle. If you do 
not feel you have the experience, do 
not attempt the installation yourself, 
but instead ask your authorized JBL 
car audio dealer about professional 
installation options.
LOUD MUSIC AND 
HEARING
Playing loud music in an automobile 
can hinder your ability to hear traffic, 
as well as permanently damage your 
hearing. The maximum volume levels 
achievable with JBL speakers, combined with high power amplification, 
may exceed safe levels for extended 
listening. We recommend using low 
volume levels when driving. JBL 
accepts no liability for hearing loss, 
bodily injury or property damage 
as a result of use or misuse of this 
product.
REAR DECK 
PRECAUTION
In some cars, fuel tanks may be 
located directly beneath the rear 
deck. Before installation, make sure 
there is adequate speaker basket 
clearance before considering this 
location!
ABOUT THE CONTENTS
The Grand Touring Series component 
system includes:
•5-1⁄4" or 6-1⁄ 2" or 6" x 8" (5" x 7") 
woofer
• Grille and mounting adapter(s)
• 1" tweeter with surface/flush 
I-Mount
™ 
(patent no. 5,859,917) kit
• Crossover network with mounting 
screws
NOTE: The supplied crossover network is designed to work with the 
above-listed transducers. Do not substitute another crossover network or 
use other speakers when connecting 
the system (see Figures 8A and 8B).
INSTALLATION TIPS
• Always wear protective eyewear 
when using any tools.
•Turn off all audio components and 
other electrical devices before you 
start. Disconnect the (–) negative 
lead from your vehicle’s battery.
• Keep speakers in their package 
until final installation. When moving 
a speaker, always rest it with the 
cone or dome facing up. Never use 
force to install any speaker.
• Check clearances on both sides of 
a planned mounting surface before 
drilling any holes or installing any 
screws. Remember that the screws 
can extend behind the surface.
•At the installation sites, locate 
and make a note of all fuel lines, 
hydraulic brake lines, vacuum lines 
and electrical wiring. Use extreme 
caution when cutting or drilling in 
and around these areas.
• Before drilling or cutting holes, use 
a utility knife to remove unwanted 
fabric or vinyl, to keep material 
from snagging in a drill bit or saw.
• For door installations, check the 
clearance with the windows 
throughout the range of the window’s travel, and verify that a 
mounted speaker will not interfere 
with the window crank or power 
window mechanism. 
• If mounting speakers elsewhere, 
check for clearance around rear 
deck torsion bars, glove box or 
other structural elements.
• Do not mount speakers where they 
will get wet.
• If possible, select a mounting site 
for the crossover network that is 
near the speakers and provides 
easy access for connections.
Figure 1. Mounting the GTO506c 
woofer with the grille.
Figure 2. Mounting the GTO606c 
woofer with the grille.
Figure 3. Mounting the GTO606c 
woofer in a standard 6" opening.
NOTE: The GTO606c uses an 
adapter to fit a variety of different 
6" openings. Select an appropriate 
adapter ring and secure it to the 
vehicle using the sheet-metal 
screws provided, then attach the 
speaker to the ring with the 
machine screws.
Figure 4. Mounting the GTO606c 
woofer in a 165mm speaker location.
The GTO8606c woofer mounts 
similarly in 6" x 8" or 5" x 7" openings.