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Ground Shaker  GS-NGMP28B New

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

Item #99030

Condition:   Brand New

Product Highlights

  • 8 inch subwoofer
  • dual ported 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.

$295.00

Reg. Price $395.00  Save $100.00
  Free 2-Years Warranty Included!

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Ground Shaker GS-NGMP28B 8" Black Dual Ported 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 Ported Sub Box
  • • Owner's Manual
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Dual-Ported Bass Power

This dual-port subwoofer enclosure features a 7 1/8" cutout diameter and two individual chambers, each with 0.81 ft³ of air volume for deep, rich bass. Tuned at 36 Hz with two precision slot ports, it delivers powerful low-end performance that fills your vehicle with clear, punchy sound. Weighing just 39 lbs with a 6 3/4" mounting depth, it offers easy installation without compromising space.

Perfect Fit, Maximum Bass

Measuring 8 1/4" in height, 54 1/4" in length, and 13 1/2" in depth, this dual-port subwoofer enclosure fits perfectly under your vehicle’s rear seat for a clean, factory-style look. Its spacious internal design maximizes airflow, producing deeper, richer bass for an immersive audio experience. Engineered for both convenience and performance, it delivers powerful sound without taking up valuable cabin space.

 

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Durable Build, Deep Bass

Crafted from 5/8" high-quality MDF wood, this dual-port subwoofer enclosure is built to last while providing a solid foundation for powerful sound. The rugged trunk liner carpet finish, sealed with premium Titebond silicone and glued with Titebond wood glue, ensures an airtight design for rich, distortion-free bass. With 2 binding post terminals, it delivers secure connections and consistent, high-performance audio every time.


SPECIFICATIONS


  • Speaker Size : 8 Inches
  • Number Of Subwoofers : 2
  • Construction : 5/8 MDF
  • Volume : 1.62 Cu. Ft.
  • Enclosure Type : Ported
  • Vehicle Make : GMC Sierra

FEATURES


Specifications:

  • Cutout Diameter: 7 1/8"
  • Total Air Volume: 1.62 ft³
  • Tuning Frequency: 36 Hz
  • 2 Individual Chambers
  • Volume Per Subwoofer: 0.81 ft³
  • 2 Slot Ports (H-3.5" W-1.5" L-11.5")
  • Weight: 39 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: 39
  • 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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