JL Audio SB-SMRT-4-2-8W3v3 User Manual

SB-SMRT-4-2/8W3V3 INSTR_SKU# 011288

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

for the

SB-SMRT-4-2/8W3v3

SKU#94448

2008+

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
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.

®

be properly mounted to the vehicle according to these

S T E P 1

Read all of the instructions through once before starting the
work. We know you’ve seen this warning before but, if

you only follow each step as it comes, the progression
won’t make sense, if you read everything all the way
through, you’ll understand, the job will be easier.

Clean out the passengers side of the vehicle so that you have
a comfortable place to work.

S T E P 2

Remove the carpeting and, the foam underlayment as if
you were accessing the battery (refer to the vehicles owners
manual if neccessary).

INSTALLATION
D I F F I C UL T Y:

OU T
OF

45

ESTIMATED TIME:
3 HOURS

S T E P 3

Under the passengers end of the dash there is a Torx screw
that holds the dash end trim panel in place, remove it and,
the trim piece.

Continued on Next Page

SB-SMRT-4-2/8W3V3 INSTR_SKU# 011288

S T E P 4

Once the trim piece is removed, there are three Torx screws
that hold the dash end piece in place, remove those and the
end piece.

S T E P 5

Looking into the end of the dash, you will notice the
aluminum extrusion that is the frame of the dash. There is an
exposed slot, slide the included 1/4-20 Speed Clip over this
notch as shown.

S T E P 6

Looking from under the dash, near the front of the vehicle,
there is a flange just under the top of the dash that has a
factory hole . Assemble the included Top Bracket and,
1/4-20 All Threaded Rod by putting on a 1/4-20 Nut and,
Split Lockwasher then threading the rod into the bracket so
that just a few threads come out on the top side. Tighten the
1/4-20 Nut and, Split Lockwasher to the Top Bracket. Once
the Top Bracket/ All Threaded Rod have been assembled,
bolt the other end of the Top Bracket to the flange using the
included 3/8-16 x 1” Hex Head Bolt, Nut, Washers and, Split
Lock Washer then rotate the Bracket so that it rests on the
top of AC system as shown, tighten down all of this hadware.

S T E P 8

This picture is only to illustrate where the DETAIL below is
located, the enclosure and, woofer have NOT been mounted
yet. Where the arrow is pointing is where the DETAIL below
is located.

D E T A I L

Install the included right angle bracket as shown through
the slot in the dash extrusion using the included
3/8-20 Nut, Washers, 3/8-16 x 1 1/2” Hex Head Bolt, and,
Split Lockwasher. the end with the hole closest to the bend
is against the dash extrusion. Slide the bracket all the way
towards the center of the vehicle, oriented as shown.

DO NOT TIGHTEN THIS ASSEMBLY YET!

S T E P 9

Remove the woofer from the enclosure. Mount the
Elevated Bracket to the Stealthbox® as shown with the
slotted end exposed and pointing towards the top of the
enclosure, using the included 1/4-20 x 1” Hex Head Bolt, Split
Lockwasher and Washer. Snug this hardware down so that it
isn’t loose but,

DO NOT TIGHTEN THIS ASSEMBLY YET!

Page 2 • JL Audio, Inc 2009

S T E P 7

On the Bottom end of the 1/4-20 All Threaded Rod, install
the Bottom Bracket as shown (approximately 1- 1 1/4” from
the bottom), using included 1/4-20 Nuts, Washers and, Split
Lock Washer.

DO NOT TIGHTEN THIS ASSEMBLY YET!

S T E P 1 0

Attach the wire from the amplifier to the terminals on the
Stealthbox®

Continued on Next Page