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

JBL 508 GTi User Manual / Operation Manual ▷ View online

Woofer/Midrange Driver
Mounting
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
adapters which allow the speaker to
be mounted in standard 4" and 5
1
/
4
"
holes respectively. 
2.
Attach the mounting ring adapter to 
the stock location using four #8 x 1
1
/
4
"
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).
4.
Mount the woofer/midrange driver to
the adapter ring using three #8 x 
5
/
8
"
screws and three shoulder washers 
as shown in Figure C.
5.
Replace the stock speaker panels.
Mounting the Woofer/Midrange in 
Custom Locations
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.
2.
Cut out the speaker hole at the
mounting location and drill the three
marked holes with a 
1
/
8
" (3mm) drill.
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).
6.
Mount the speaker to the hole location
using three #8 x 1
1
/
4
" 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
match with the slots in the grille. Twist
the grille about 
1
/
2
" (12mm) clockwise to
lock the grille into place.
7
FABRIC 
DISPLACEMENT 
RING
WOOFER/
MIDRANGE
Figure D
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 7
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.
Logo Orientation on Grille
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. 
Mounting the 
408 and 508GTi Tweeter
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!
Tweeter Surface Mounting
Instructions
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
mounting location. Use three 
3
4
"
mounting screws to secure the mounting
plate in place as shown in Figure F.
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.
c) Push the tweeter down onto the
mounting plate making sure to line up the
bayonet tabs with the slots in the tweeter
housing.
d) Twist the tweeter clockwise about 
1
4
" to
lock it into position. 
8
A
C
B
TWEETER SURFACE MOUNT INSTALLATION
Figure F
GRILLE
FRAME
METAL
GRILLE
Figure E
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 8
Tweeter Surface Angle Mounting
Instructions
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
"
sheet metal screws as shown in Figure G.
b) Secure the mounting plate to surface
angle mount adapter using two 
5
16
" 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.
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 
1
4
" to
lock it into position. 
9
A
B
D
C
Figure G 
TWEETER SURFACE ANGLE INSTALLATION
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 9
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.
b) Push the Flush Mount Cup with the
metal spring into the hole that was cut in
step a. 
c) Tighten the larger 
3
4
" spring mounting
screw to lock the Flush Mounting Cup into
the mounting hole.
d) Secure the mounting plate to the Flush
Mount Cup using three 
5
16
" screws.
Connect the speaker wire from the
crossover to the tweeter (see Figures I 
and K), making sure to observe correct
polarity.
e) Push the tweeter down onto the
mounting plate making sure to line up the
bayonet tabs with the slots in the tweeter
housing.
f) Twist the tweeter clockwise about 
1
4
" to
lock it into position. 
10
C
A
B
Flush Mount Cup
FLUSH MOUNT INSTALLATION
Figure H 
D
F
E
Figure I
TWEETER FLUSH MOUNT
INSTALLATION
408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 10
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