SSBOXES Chevy Silverado/GMC Sierra 2500/3500 Extended Cab Quad 8-Inch Front-Fire Ported Subwoofer Box

SSBOXES front-fire quad 8-inch ported subwoofer box is built for Chevy Silverado and GMC Sierra Extended Cab 2500/3500 HD trucks with the matching rear-seat floor layout.

Chevy/GMC 2500 and 3500 Extended Cab 4x8 Front-Fire Box

This enclosure is for customers searching for a 4x8, 4 8, or quad 8 subwoofer box for a Chevy or GMC Extended Cab HD truck. It is designed for strong truck bass with a front-fire ported layout and a heavy-duty bedliner-style coating.

Vehicle Fitment

• Fits: Chevy Silverado Extended Cab 2500 and 3500 HD models with the same seating/floor style
• Fits: GMC Sierra Extended Cab 2500 and 3500 HD models with the same seating/floor style
• Does not fit Crew Cab models
• Subwoofer layout: Four 8-inch subwoofers

Box Dimensions

• Length: 54 inches
• Width: 14.75 inches
• Front height: 10 inches
• Rear height: 7 inches
• Mounting depth: 8.75 inches
• Woofer cutouts: 7.5 inches

Port and Build Specs

• Port length: 9.5 inches
• Port width: 2.5 inches
• Port height: 3.75 inches
• Air space per sub: 0.7 cubic feet
• Box tuning: 37 Hz
• Wood type: High-quality MDF
• Finish: Black Armor bedliner-style coating
• Speaker terminals included
• Made in USA

Install Notes

Speaker wire and metal screws are not included. Confirm your exact cab style, seat layout, floor shape, and mounting depth before ordering or installing.