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Ground Shaker  GS-NGM28B

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

Item #99023

Condition:   Brand New

Product Highlights

  • 8 inch subwoofer
  • dual sealed box
  • GMC Sierra sub
  • Ext-Cab audio enclosure
  • black bass box

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

$300.00

Reg. Price $380.00  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-NGM28B 8" Black 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?
  • • 8" Black Dual Sealed Sub Box
  • • Owner's Manual
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Dual Subwoofer Power, Perfect Fit

This dual subwoofer enclosure features a 7 1/8" cutout diameter and two individual chambers, each with 0.89 ft³ of air volume, delivering deep, punchy bass. With a total air volume of 1.78 ft³ and a sturdy 40 lbs build, it provides powerful sound without taking up extra space. The 6 3/4" mounting depth allows for easy installation while maximizing bass performance for every ride.

Spacious Design, Big Bass

Measuring 8 1/4" in height, 54 1/4" in length, and 13 1/2" in depth, this dual subwoofer enclosure fits neatly under your vehicle’s rear seat for a sleek, factory-style look. Its generous internal space maximizes airflow, producing richer and deeper bass. Designed for both performance and convenience, it delivers powerful sound without compromising cabin space.

 

Kicker_KM
Kicker_KM
Built Tough, Sound Perfect

Constructed from 5/8" high-quality MDF wood, this dual subwoofer enclosure ensures long-lasting durability and stability. Its rugged trunk liner carpet finish, sealed with premium Titebond silicone and glued with Titebond wood glue, creates an airtight design for deep, distortion-free bass. Equipped with 2 binding post terminals, it delivers reliable connections and consistently powerful, crystal-clear sound.


SPECIFICATIONS


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

FEATURES


Specifications:

  • Cutout Diameter: 7 1/8"
  • Total Air Volume: 1.78 ft³
  • 2 Individual Chambers
  • Volume Per Subwoofer: 0.89 ft³
  • Weight: 40 lbs
  • Mounting Depth: 6 3/4"

 

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 design
  • 2007 models fit only old body style
  • Will not fit trucks with V-shape hump (use JCHV models for V-shape 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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