JL Audio Stealthbox SB-GM-AVAL/12W3v3, Stealthbox SB-GM-AVAL/12W6v2 Installation Manual

INSTALLATION
DIFFICULTY:

INSTALLATION GUIDE

for the

SB-GM-AVAL/12W3v3

SB-GM-AVAL/12W3v3

SB-GM-AVAL/12W6v2

SB-GM-AVAL/12W6v2

2001-Up

2001-Up

Chevrolet Avalanche &

Chevrolet Avalanche &

2002-Up Cadillac EXT

2002-Up Cadillac EXT

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. Also, keep in mind that your warranty coverage

extends to 1 year if your system is installed or approved by your authorized JL Audio dealer. If you

prefer to perform your own installation, please read this installation guide completely

before beginning the process.

If you choose to per form the installation yourse lf, it is absolute ly vital that
the Stealthbox

®

be properly m ounted to the vehicle according to these

instructions. Failure to mount the enclosure properly pr esents two problems:

1) The sub-bass performance will suf fer due to the movement of the enclosure
caused by the force exerted by the woof er(s).

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

STEP 1

Remove any contents from the rear seats.

Continued on Next Page

STEP 2

Bring both front seats to their for ward most position.

Collaspe the rear seats.

Remove the plastic mid-gate hinge covers.

STEP 3

With an 13mm deep socket, remove the pair of bolts that
secure each hinge to the mid-gate.

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SB-GM- AVAL_I NSTR_SKU#011017

2

5

OUT
OF

Continued on Next Page

SB-GM-AVAL_INSTR_SKU#011017

SB-GM- AVAL_I NSTR_SKU#011017

STEP 8

Place a supplied phillip head screw into each pass-through
opening of the factory strike latch.

STEP 7

With a T-30 Torx socket, remove the pair of strike latches from
the top of the mid-gate.

Each factory bolt has a spacer. Keep these factory spacers for
use in later steps.

STEP 5

Remove the mid-gate out of the truck.

STEP 4

With an 13mm deep socket, remove the pair of nuts that
secure each hinge to the floor.

Pull both hinges out of the truck.

Page 2 • JL Audio, Inc 2006

STEP 10

From ins ide the t ruck, prop t h e hinged flaps t hat are l aying
on the re ar seats. Use t h e pull out loop tie d own that a re
located in the si de-wa l l o f the bed to h o ld these flaps up.

STEP 12

Place a supplied flat washer onto each supplied hex cap
bolt . U se these b olt asseblie s t o m ount the facotry hinges to
the Stealthbox®.

STEP 11

With h e lp from a s e cond person, po sisti on the Ste a lthbox®
into mid-gate area . Allow th e strike latch e s to enter the
crossbar. Make sure that the Stealthbox® fits flush against
the rear wall.

STEP 9

Place the facotry space rs fro m STEP 7 betwee n the st rike
latch an d the Stea lthbox®. Secure the factor y str ike latch e s
to the top of the Stea lthbox®.