408 GTi - JBL Car Audio User Guide / Operation Manual. Page 7

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

Figure D

408/508 MANUAL.QXP  7/17/98 11:21 AM  Page 7