JL Audio Stealthbox SB-M-3-SPD/10W3v3, Stealthbox SB-MA-3-SPD/10W3v3, Stealthbox SB-MA-3-SDN/10W3v3 Installation Manual

I N S T A L L A T I O N G U I D E

for th e

SB-M-3-SPD/10W3v3

SKU# 94378/ 94379

20007+ Mazda 3/ Mazda Speed 3

Thank you for choosing a JL Audio Stealthbox® for your automotive sound system. With proper

installation, your new vehicle-specific enclosed subwoofer system will deliver years of listening pleasure.

We strongly recommend that you have your new Stealthbox® installed by your authorized JL Audio

dealer. The installation professionals employed by your dealer have the necessary tools and experience

to disassemble and reassemble your vehicle properly. If you prefer to perform your own installation,

please read this installation guide completely

before beginning the process.

If you choose to perform the installation yourself, it is absolutely vital that
the Stealthbox

®

be properly mounted to the vehicle according to these

instructions. Failure to mount the enclosure properly presents two problems:

1) The sub-bass performance will suffer due to the movement of the enclosure
caused by the force exerted by the woofer(s).

2) A loose enclosure presents a serious safety hazard in the event of a collision
or sudden deceleration.

S T E P 1

In the Mazda3, remove carpeted floor panel by unsnapping
at rear-most edge then remove tool panel.

In the Speed3, remove the foam floor riser.

Continued on Next Page

S T E P 2

Remove bolt securing spare tire with lug wrench provided in
tool panel then remove spare tire.

S T E P 3

Remove sealant material from around mounting boss at
center of spare tire well.

SB-M-3-SPD/10W3v3 INSTR_SKU# 011255

INS TALLATIO N
D I F F I C U LT Y :

35

OU T
OF

EST IMATED TIME:
23 HO URS

Continued on Next Page

SB-M-3-SPD/10W3v3 INSTR_SKU# 011255

S T E P 7

Remove Stealthbox® from packaging and install 3/8 X 2.25
mounting studs into threaded inserts at bottom of enclosure.
Thread driver’s side stud in, leaving about 1 1/2-inches
extended. Thread passenger side stud in, leaving only about
1/2-inch extended.

S T E P 6

Locate rivet in floor of spare tire well at approximately 10
o’clock position. Drill out rivet with 1/4-inch drill bit, then
enlarge to 1/2-inch (may need to be drilled from under the
car). Place wax square provided onto floor of spare tire well in
approximately 2 o’clock position as shown in illustration.

S T E P 5

Place sealant sheet provided over modified area as shown

S T E P 4

Carefully drill out spot welds using appropriately sized drill bit
and pry mounting boss from spare tire well floor. Install (4)
#8-32 x 1 screws, nuts, washers to seal holes left by removed
spot welds.

Page 2 • JL Audio, Inc 2008

S T E P 9

Extend the mounting stud on passenger side of enclosure to
1 1/2-inches.

S T E P 1 1

Place enclosure back into mounting position with both
mounting studs extended through holes drilled in floor.

S T E P 1 0

Route woofer wiring to Stealthbox® enclosure location and
connect to terminal cup at bottom of enclosure. If the rest
of the system is completed, test the Stealthbox® to ensure
it’s working.

S T E P 8

Place the enclosure into the mounting location with driver’s
side stud extended through hole previously drilled in spare
tire well floor. Press down on the enclosure to make an
impression in the wax square. Remove the enclosure to
reveal the impression in the wax square. Drill 1/2-inch hole in
location indicated by impression in wax square.