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King Boxes 12-Inch Dual Upfire Ported Subwoofer Box; Charcoal Sprayed Finish (15-19 Sierra 3500 HD Crew Cab)Find parts that fit my vehicle

Item SHG55250
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13 Reviews of King Boxes
Our Price

$279.00 each

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      Product Information

      Features, Description, Q&A, Specs & Installation

      Features

      • King Boxes 12-Inch Dual Upfire Ported Subwoofer Box; Charcoal Sprayed Finish
      • Houses (2) 12-Inch Subwoofers for Powerful Bass
      • Upfire Ported Design for Enhanced Low-Frequency Output
      • Charcoal Sprayed Finish for Professional Appearance
      • Heavy-Duty MDF Construction for Superior Strength
      • Fits 2015-2019 Sierra 3500 HD Crew Cab Models

      Description

      Deliver Maximum Bass Impact. The King Boxes 12-Inch Dual Upfire Ported Subwoofer Box is built for audiophiles who demand powerful, high-quality bass. Its upfire ported design channels sound directly into the cabin for deeper resonance and greater low-frequency response, ensuring your music is felt as much as it’s heard. The precise internal volume tuning optimizes subwoofer performance for tight, punchy bass without distortion.

      Built for Strength and Acoustic Accuracy. Constructed from thick MDF, this enclosure maintains rigidity to eliminate unwanted vibrations that can muddy sound quality. The charcoal sprayed finish adds a sleek, professional look while protecting the surface from wear. Engineered for the Sierra 3500 HD Crew Cab, it fits securely under the rear seat while preserving passenger comfort.

      Installation. This product installs by placing under the rear seat and connecting to a compatible amplifier and subwoofers.

      Application. This King Boxes 12-Inch Dual Upfire Ported Subwoofer Box fits 2015-2019 Sierra 3500 HD Crew Cab models.

      King Boxes AK-GMC14-12

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      Installation & What's in the Box

      Installation Info

      Installation Time

      (approx) 1 Hour

      Difficulty Level:

      Light to Moderate mechanical skill required.

      Installation Guides

        No guide available for this part yet.

      What's in the Box

      • (1) Dual Ported Enclosure
      • (2) Terminal Cups
      • (1) Wiring Jumper
      • (1) Mounting Strap Set
      4.7

      Reviews of King Boxes Interior Products (13)

      Questions & Answers

      No questions about this product yet. Ask the First Question

      Will It Fit My Sierra 3500

      • 6.0L V8 - 15, 16, 17, 18, 19
      • 6.6L V8 Duramax - 15, 16, 17, 18, 19