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2014 - UP GMC Sierra Crew Cab Truck Dual 12 Sub Box Subwoofer Enclosure

Was $264.99 Save: $115.04 (43%)
Based on 1 reviews
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Adding bass to a truck can be a very complicated problem to tackle, especially when building a box! We offer pre-built enclosures that are ready to be dropped into your 2014 - UP GMC Sierra that offers unbeatable performance and sound quality that simply cannot be matched. This is a dual 12" down firing model enclosure.

Our boxes are made from precision cuts of MDF. They are then liquid nailed, nailed and completely sealed. We then wrap them with high quality carpet that matches most vehicle interiors. All Boxes feature high grade spring loaded terminal cup(s) for the absolute best connection possible. All the custom series enclosures are made to fit precisely into your vehicle to the get the max performance from every extra inch of wasted space.

We guarantee you will not only see a difference in the quality of the boxes we build, but you will hear the difference and that is what is it is truly all about.

2014 - UP GMC Sierra Crew Cab Truck Dual 12" Sub Box Subwoofer Enclosure


  • 2014 - UP GMC Sierra Crew Cab Truck Custom Dual 12" Subwoofer Enclosure Sub Box
    • Mounting Depth: 6-1/2"
    • Air Space: 0.74 Cubic Feet per Sub
    • Sealed Enclosure
  • Constructed with High Quality MDF
  • High Quality Twist Knob / Banana Plug Terminal Cup (Bare Wire 'up to 10GA')
  • High Quality Black Carpet
  • Overall Dimensions: 49-1/2" L X 16-1/2" W X 9-3/4" H
  • Enclosure installs under the rear seat, subs fire downward

This box fits:

  • 2014 - UP GMC Sierra Crew Cab Truck
This item is New
1-Year Manufacturer's Warranty
Proposition 65 Warning for California Consumers

WARNING: This product can expose you to chemicals including Formaldehyde (gas) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to

Ratings and Reviews


1 product ratings

Subwoofer Enclosure

Sep 3, 2021

Enclosure arrived in a quickly manner, The holes for the subwoofers was cut a whole lot better than my last enclosure. My last enclosure had the holes cut a little bit big which caused a few issues with the mounting process. This is the third enclosure I have purchased through you'll. Unfortunately my subwoofers are tearing the enclosures apart.

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Frequently Asked Questions for this Product:

When will my order ship?
Most orders placed before 3:00 PM CST will ship within 24 hours. If you need a product by a specific time please contact us at 1-877-275-4434 before ordering.
When will I receive my tracking number?
Most tracking numbers are sent out around 5:30 PM CST of the following business day. Please allow 24-business-hours after ordering before requesting tracking information.
How fast will I receive my product?
Depending on your location it may take 3-4 business days for your order to arrive. Your tracking number will tell you the exact day your order will arrive. If you need an order by a specific date we recommend you call us at 1-877-275-4434

Return Policy
You may return this item in its original condition within 30-Days for a refund, minus a 20% restocking fee, and minus any shipping charges we paid to get the item to you.