Down4Sound Down4Sound PRO-FAB - Birch - 2x 8-Inch Ported Subwoofer Enclosure – 19-24 GM/Chevy Crew Cab – No Lift

Description Warranty Information 2 Reviews Description Tailored specifically for 2019-2024 GM/Chevy Crew Cab models, the Down4Sound PRO-FAB enclosure is designed to provide precise, impactful bass without requiring a seat lift. Featuring dual 8-inch subwoofer openings, this enclosure is crafted from premium birch wood and coated with a durable polyurethane bedliner to ensure longevity and performance. With its precision tuning and optimized port design, this enclosure guarantees exceptional sound quality and reliability. Compatibility: 2019-2024 GM/Chevy Crew Cab (Under Seat, No Seat Lift Required) Configuration: Dual 8-inch subwoofer openings Material: Premium birch wood with polyurethane bedliner coating for added durability Outside Dimensions: Width: 52 inches Front Height: 11 inches Rear Height: 7.5 inches Depth: 13 inches Net Airspace (After Displacements): 1.795 cubic feet Subwoofer Cutout: 7.5 Inch Port Information: Area: 10.98 square inches per port Depth: 27 11/16 inches Tuning Frequency: 33.5 Hz Recommended Subwoofer: Optimized for Down4Sound DBz 8" Subwoofers ****ALL SALES ARE FINAL**** View All Close Warranty Information Warranty Information Your new Down4Sound product is covered by 1 limited warranty if purchased from Down4Sound or an authorized Down4Sound dealer. This warranty does not cover improper installation, accidental damage, misuse, abuse, improper wiring, operation of unit outside of listed specifications, or any product that has been modified or repaired by anyone other than Down4Sound. Your warranty covers defects in materials and/or workmanship ONLY and is not an insurance policy. The warranty only covers the original owner of the amplifier. All warranty returns must be accompanied by the original sales invoice or receipt. You must contact us to request an RMA number prior to sending any returns via the RMA request form on our websi te. You are responsible for the cost of shipping your product back to us for warranty examination. If your product is covered under warranty, shipping back to you will be at no charge to you – if your product is replaced/repaired outside of warranty you must pay for return shipping and repair bill prior returning of the product or if no defect is found you are required to pay for return shipping only. At the sole discretion of Down4Sound your product will be either repaired or replaced when it is being covered under warranty. In the event of shipping damage due to improper packaging on products being returned to Down4Sound the customer is liable for the cost of all damages, necessary repairs, or replacement. Be sure to properly pack your return! * Extended additional warranty purchased on amplifiers take in affect from the date of purchase and must also be stated on orginal sales invoice or receipt. Refund/Return Policy: https://www.down4soundshop.com/shipping-returns/ Down4Sound - Hours of Operation Monday 6am - 9pm PDT Tuesday 6am - 9pm PDT Wednesday 6am - 9pm PDT Thursday 6am - 9pm PDT Friday 6am - 9pm PDT Saturday 8am - 4pm PDT Sunday Closed View All Close 2 Reviews 5 SQ meets the L Posted by Shaun "Herts" Harris on Feb 23, 2026 Ok, I purchased the box before the Subs. So i matched the Subs with the box Parameter. Very Well Build and Sound Quality is A1. I merged 2 B2Audio Rage 8s on a 1200 watt kicker. A 1/4 turn on my bass knob, Poop gets violent. This is in my 22 Silverado High Country under rear seat. Everything connected perfectly, 1 speaker terminal so if you have 2 of something- be prepared to combine the Ohms. Set-Up (2) B2Audio Rage 8s (500rms each) (1) Kicker 1200.cxa tuned myself with a voltermeter D4Sound Box - On sale @ post time If this combination doesn't impress you, cut the hair out your ears, lol. I love it! 5 Incredible Box Posted by Randal Villines on Oct 23, 2025 This box is amazing. I went from a cheap 4 sub box with terrible design to this high quality 2 subwoofer ported box. The box sounds amazing. I cut out the round subs and put in a couple of L7's and you can't beat the quality of this box. The length of the port and airspace are not just randomly fabricated, you can tell this box was made to sound amazing in our new gm trucks. I'm gonna put two Solo X 8's soon. View All Close