JL Audio Stealthbox® SB-GM-AVAL/12TW3 (Open-box, Like New)

Custom fit subwoofer enclosure for select 2002-2013 vehicles from Chevrolet, Cadillac

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• Loaded Vehicle Specific Stealthbox Subwoofer Enclosure with Dual JL Audio 12TW3-D4
• 800 Watts RMS Power Handling
• Stealthbox seamlessly replaces the factory mid-gate

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Current Promotions (2 offers)

Get the most out of your system with premium sound damping. NVX sound damping is 2.3mm thick, making it great for increasing SPL, stopping rattles, quieting vibrations, and more. Simply click "Add Both to Cart" to redeem. This offer cannot be combined with any other coupons or offers.

JL Audio Stealthbox® SB-GM-AVAL/12TW3 (Open-box, Like New)

100% off

Priced separately $1,964 98

Promo Savings of $89 99

Total price:

$1,874 99

Get the most out of your Loaded Enclosure with the NVX SDTK20. Eliminates road noise, quiet vibrations, and increase the sound quality and output of audio system, 50%. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

JL Audio Stealthbox® SB-GM-AVAL/12TW3 (Open-box, Like New)

50% off

Priced separately $1,934 98

Promo Savings of $30 00

Total price:

$1,904 98


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Item Condition - Like New:
A Open Box, Like New product is an apparently untouched product in perfect condition that includes all accessories and packaging. The original protective wrapping may be missing, but the original packaging is intact and pristine. There are absolutely no signs of wear on the item or installation. Instructions are included. Warranty details are included in the item description or comments. Item is suitable for presenting as a gift and savings should be abundant!


Subwoofer Features:

  • Two JL Audio 12TW3-D4 Subwoofer
  • Power Handling:
    • RMS: 800 watts total / 400 watts each
  • Recommended power range: 400 - 800 watts RMS
  • Wired to a 4 ohm load
  • Injection molded, mica-filled polypropylene cone
  • Rubber surround
  • No pole vent: permits mounting close to rear wall of enclosure.
  • Very small sealed enclosure volume requirements
  • Very long linear excursion capability
  • DMA-optimized motor designs
  • Patented "concentric tube" architecture
  • Patented "floating cone attach method" technology
  • Cast alloy frame
  • Aluminum-alloy dust cap and rear cap with JL Audio logo
  • Precision-built in USA at JL Audio's Miramar, Florida factory
  • Magnet: Single stacked
  • Frequency Response: 22-200 Hz
  • Sensitivity: 84.11 dB
  • Xmax: 15.2 mm
  • Matching Amplifier: JL Audio XD1000/1v2
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Enclosure Features:

  • Compatible with select 2002-2013 vehicles from Chevrolet, Cadillac
  • Forward-firing design
  • Sealed fiberglass enclosure
  • Steel mesh grille included
  • Stealthbox® seamlessly replaces the factory mid-gate
  • Maintains folding function to allow access between cabin and bed
  • Black texture coated finish
  • Rear glass storage is lost
  • Will not fit Hummer H2 SUT
  • Binding post terminals for secure and sturdy connection and installation
  • OEM Color: All
  • Color Match Grade: Excellent

Color Matching your Stealthbox®:

Some JL Audio Stealthboxes are not designed to perfectly match OEM colors. Some colors will contrast with OEM colors in order to provide a stylish setup. If you are looking for the closest color match, please select the JL Audio Stealthbox® color that is as close to your OEM color as possible and indicate your vehicle's interior color when ordering

Carpet Color Grade Identification
Perfect Actual exact factory color and texture (dye lot may differ slightly)
Excellent Precise color match, different texture
Good Very close to factory shade/tone
Fair Same basic color, different shade/tone
Poor Same basic color, substantially different shade/tone
Contrasts Not intended to match any factory color. Usually black. Good choice if no Good or better color match exists

Message from JL Audio: Our goal is to provide all Stealthbox® products in colors that match well with factory interiors. Because of availability issues with carpet colors, some Stealthbox® colors are not precise matches at this time. The match grades above give you an indication of how precise our color match is for each Stealthbox® model.

JL Audio SB-GM-AVAL/12TW3 owner’s manual

Compatible Vehicles

Please use our Fitment Guide to determine specific compatibility for the submodel and audio features

  • 2002 Cadillac Escalade EXT
  • 2002 Chevrolet Avalanche 1500
  • 2002 Chevrolet Avalanche 2500
  • 2003 Cadillac Escalade EXT
  • 2003 Chevrolet Avalanche 1500
  • 2003 Chevrolet Avalanche 2500
  • 2004 Cadillac Escalade EXT
  • 2004 Chevrolet Avalanche 1500
  • 2004 Chevrolet Avalanche 2500
  • 2005 Cadillac Escalade EXT
  • 2005 Chevrolet Avalanche 1500
  • 2005 Chevrolet Avalanche 2500
  • 2006 Cadillac Escalade EXT
  • 2006 Chevrolet Avalanche 1500
  • 2006 Chevrolet Avalanche 2500
  • 2007 Cadillac Escalade EXT
  • 2007 Chevrolet Avalanche
  • 2008 Cadillac Escalade EXT
  • 2008 Chevrolet Avalanche
  • 2009 Cadillac Escalade EXT
  • 2009 Chevrolet Avalanche
  • 2010 Chevrolet Avalanche
  • 2011 Chevrolet Avalanche
  • 2012 Chevrolet Avalanche
  • 2013 Chevrolet Avalanche

Specifications & Details

Subwoofer Specifications
Subwoofer Design
Round / Circle
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
RMS Power Handling
400 watts
Total RMS Power Handling
800 watts
Woofer Surround
Woofer Composition
Mica Injected Polypropylene - MIPP
84.11 dB
Frequency Response
22 - 200 Hz
Xmax (millimeters)
15.2 mm
Subwoofer Size
Enclosure Specifications
Number of Subwoofers
Box Style/Shape
Vehicle Specific
Number of Terminals
Terminal Type
Binding posts
Box Exterior Color
Box Finish
Texture coated finish
Final Wired Impedance
Type of Enclosure
Box Type
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Item Details


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