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I N S T A L L A T I O N   G U I D E 

for the 

SB-B-3SER/CPE/SDN(E90\92)

SKU#94281

2006-Up Sedan

2007-Up Coupe

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 2 years 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 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

Remove anything stored in the trunk so that you are working 
in a clean environment.

Unpack the Stealthbox® and test for proper operation 

before continuing!

The wiring for the Stealthbox® should go from the seam 
between the seatback and the floor to the amplifier location.

Along the bottom of the rear deck from the trunk, there are 
two recessed areas (as indicated by arrows at left) with two 
bolts going up into the deck in each recess.

Continued on Next Page 

S T E P   2 

The outer-most bolt in each recess must be removed.

SB-B-3SER/CPE/SDN INSTR_SKU# 011256 

INSTALLATION  

D I F F I C U L T Y :

1

5

OUT   

OF

ESTIMATED TIME:

            30 MIN

S T E P   3

Using each of the black oxide 3/8"-16 x 1 1/2" bolts assemble 
a split lock washer, flat washer, bracket, 1" spacer, through the 
hole in the bracket (the slot will mount the Stealthbox® to 
the bracket).

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