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Ground Shaker  GS-NGMTW3212B

12" Black Tw3 Dual Sealed Sub Box for 1999-2006 & 2007 Classic GMC Sierra Ext-Cab

Item #99058

Condition:   Brand New

Product Highlights

  • 12" TW3 Subwoofer
  • Dual Sealed Box
  • GMC Sierra Audio
  • Classic Ext-Cab
  • Truck Bass Upgrade

  Free 2-Years Warranty Included!
60 DAYS Returns Accepted.
FREE Lifetime Tech Support.
FREE Shipping (No Minimum).
60 DAYS Price change protection.

$345.00

Reg. Price $425.00  Save $80.00
  Free 2-Years Warranty Included!
60 DAYS Returns Accepted.
FREE Lifetime Tech Support.
FREE Shipping (No Minimum).
60 DAYS Price change protection.

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Ground Shaker GS-NGMTW3212B 12" Black Tw3 Dual Sealed Sub Box for 1999-2006 & 2007 Classic GMC Sierra Ext-Cab

We are an Ground Shaker authorized dealer so you get up-to-date, fully warrantied products. Shipping is free to the lower 48 states on everything you order!

What's Inside?
  • • 12" Black Tw3 Dual Sealed Sub Box
  • • Owner's Manual
Kicker_KM
Big Bass, Perfect Fit

Built for serious sound, this sub box features an 11 5/8" cutout and dual individual chambers for balanced, powerful performance. With 1.78 ft³ total air volume and 0.89 ft³ per subwoofer, it delivers deep, clean bass that transforms your listening experience. At 40 lbs with a 6 1/2" mounting depth, it’s a solid, reliable upgrade for your truck audio system.

Low Profile, Big Performance

With dimensions of 8 1/4” H × 54 1/4” L × 13 1/2” D, this sub box is engineered to fit neatly under your rear seat while maximizing space. Its sleek, low-profile design keeps your truck interior clean without sacrificing powerful bass output. Upgrade your audio system with a perfect balance of fit, style, and performance.

 

Kicker_KM
Kicker_KM
Built Tough for Powerful Sound

Constructed from 5/8" high-quality MDF wood and finished with a durable trunk liner carpet, this sub box is made for strength and long-term reliability. Sealed and glued with premium Titebond materials, it ensures an airtight enclosure for deeper, cleaner bass. Dual binding post terminals provide a secure, hassle-free connection for a smooth and powerful audio upgrade.


SPECIFICATIONS


  • Speaker Size : 12 Inches
  • Number Of Subwoofers : 2
  • Construction : 5/8 MDF
  • Volume : 1.78 Cu. Ft.
  • Enclosure Type : Sealed
  • Vehicle Make : GMC

FEATURES


Specifications:

  • Cutout Diameter: 11 5/8"
  • Total Air Volume: 1.78 ft³
  • 2 Individual Chambers
  • Volume Per Subwoofer: 0.89 ft³
  • Weight: 40 lbs
  • Mounting Depth: 6 1/2"

 

Dimensions:

  • Height: 8 1/4”
  • Length: 54 1/4”
  • Depth: 13 1/2”

 

Construction:

  • 5/8" high-quality MDF wood
  • Carpeted with durable trunk liner finish
  • Sealed with high-quality Titebond silicone
  • Glued with high-quality Titebond wood glue
  • 2 Binding post terminals

 

Installation:

  • Fits under rear seat
  • Upward firing
  • 2007 fits only old body style
  • Will not fit trucks with V-shaped hump (use JCHV models for V-shaped hump)
  • UPC:
  • Weight: 40
  • Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for replacement within 2 Year(s) from the original date of purchase with proper return authorization.

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