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QUAD VENTED 8" SUBWOOFER ENCLOSURE BOX for 2007-Up GMC SIERRA 1500/2500HD/3500HD

Product description


Quad 8" Subwoofer Enclosure for 2007-2026 GM Crew Cab (Chevy/GMC)

Upgrade your truck's audio system with this premium custom-fit, quad 8-inch subwoofer enclosure, engineered specifically to fit perfectly under the rear seats of 2007 to 2026 GMC Sierra and Chevrolet Silverado Crew Cab trucks. Designed with a clean, unbranded front fascia that seamlessly matches both Chevy and GMC interiors without logo conflicts, this enclosure maximizes your available cabin space while delivering a luxurious aesthetic and extreme, heavy-hitting bass. Utilizing a highly efficient front-firing design to house four 8-inch subwoofers, it is built to move massive amounts of air and guarantee an incredibly deep, loud, and responsive low-end punch.

Built to withstand extreme acoustic pressure and the wear-and-tear of daily use, this enclosure features heavy-duty construction with pre-installed baffle material to eliminate power-robbing box resonance. The exterior is beautifully wrapped in black aviation-grade carpet on the top and bottom, complemented by premium black faux leather on the front and sides for a sleek, custom look. Complete with premium spring-loaded push-pin terminals, optimal internal air space for a four-subwoofer configuration, and a rugged build quality, this box is the ultimate high-end housing for a massive 8-inch quad setup.

Key Features & Specifications
  • Universal GM Fitment: Clean, logo-free design engineered to fit seamlessly under the rear seats of both 2007-2026 GMC Sierra and Chevrolet Silverado 1500/2500/3500 Crew Cab trucks.
  • Subwoofer Fitment: Features four precise cutouts to accommodate a massive quad 8" subwoofer setup.
  • Enclosure Type: Front-firing acoustic design engineered for incredibly deep, loud, and impactful bass output from four subwoofers.
  • Acoustic Treatment: Internally lined with preinstalled baffle material to reduce standing waves and cabinet resonance for cleaner sound.
  • Premium Finish: Beautifully wrapped in black aviation-grade carpet on the top and bottom, with sleek black faux leather on the front and sides.
  • Wiring Terminals: Equipped with high-quality spring-loaded push-pin terminals for a secure, dependable electrical link to your amplifier.
  • Firing Direction: Front-firing woofers maximize acoustic transfer directly into the cabin, providing a highly responsive low-end punch.
  • Installation Note: Designed to fit entirely under the rear seat (requires removing the factory under-seat plastic storage tray if equipped).

Free shipping applies to orders shipped within the 48 Contiguous U.S. States. Most orders paid before 10:00AM (Pacific Standard Time) ship the same business day. Insurance and Tracking are included, and tracking info will be updated upon shipment. 

Additional shipping fees are required for all other locations (including but not limited to):
PO Boxes, APO/FPO address, AK, HI, PR, Guam, Canada, and other countries outside the USA

We will make every attempt to process and ship orders within 2 business days of your cleared payment. We will contact you, should there be a problem or delay with your order. Please allow proper delivery time for your package to arrive. 

Orders via UPS Ground arrive within 2-6 business days, depending on your distance from Southern California. Smaller or lighter weight items typically ship via USPS First Class or USPS Priority Mail.

International Buyers – Please Note:
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.

Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

You may return merchandise to Life After Bass for a refund or exchange within 30 days of purchase.

Refunds
Refunds are available within 30 days of the original date of purchase. All refunds will have a 20% processing fee assessed. However, if you choose to exchange the item, and the returned item is still factory sealed, there will be NO processing fee assessed.

Exchanges
If you purchase an item and want to exchange it for a different product, we can do so if you contact us within 30 days of the original purchase date. If the returned item is still brand new and factory sealed, you will be issued a store credit for the full price of the item. If the item comes back to us in used or open box condition, there will be a 20% processing fee deducted from the issued store credit. When items are returned, and can no longer be sold as brand new, we must then sell them at a significantly lower price. For this reason, we must assess a 20% processing fee for open box returned items.

Defective Merchandise
We will replace a defective product with the same item within the 30 days of the original date of purchase. If you prefer to exchange your item for a different product, we will issue a store credit for the full price of the item, minus the outgoing shipping costs that were paid to ship the original item to you.

Refunds are also available during the initial 30 day period. Refunds are subject to a 20% processing fee. If you prefer that we simply replace the item, then there will be no fee charged.

If the product develops a problem past the first 30 days, please contact us and we’ll do our best to assist you.

Damaged Merchandise
All packages are inspected for damage prior to leaving our warehouse. If your merchandise is damaged in transit by the shipping courier, please notify us immediately. Damaged merchandise must be replaced with the same model only. You may also return damaged merchandise for a refund; however, a 20% processing fee will apply. The processing fee will only apply if you choose to return the item for a refund. No fee will be assessed if we are able to resolve the issue by replacing your damaged merchandise.

Return Shipping
Return shipping cost (the cost to send merchandise back to our store) is comparable to your cost of driving to any store for returning an item, which is not reimbursable. Therefore, we do not reimburse any return shipping cost.

We will cover all outgoing shipping costs incurred to ship the newly exchanged item to you. The return shipping costs required to ship the item back to our store, are always paid by the customer.

Returning Items
All returned merchandise must be in original condition, and must include the original factory box (UPC bar codes and serial numbers must be intact) and factory packaging (ie. foam, plastic, wrapping, etc.), accessories (ie. remote, bass knob, wires, etc.), and all instruction manuals. The RMA number or any other inscriptions must not be written or printed on the product box or packaging. We will not process the return if any of these conditions are not followed.

Return merchandise that is lost or damaged in transit is solely the shipper's responsibility. It is important to save the tracking information and to properly ensure all merchandise is being safely returned to Life After Bass.

Return Exceptions
Although our return policy is quite flexible on most items, there are a few exceptions. The following are examples of items that can not be returned:

Items with physical damage unrelated to shipping. Physical damaged items are also not covered under warranty.

Kicker SoloX and Power Acoustik MOFO Subwoofers AND Replacement Cone Assembly (Re-cone) Kits can not be returned due to the nature of their use (SPL competition).

Blown subwoofers or speakers that have burned voice coils (or punctured holes) are not covered under warranty.

Software that has already been registered or installed cannot be returned.

We accept most major credit and debit cards, as well as PayPal.

International Buyers – Please Note:
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.

Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

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