Dual 12" Subwoofer Enclosure Compatible with 2014-2018 Chevrolet Silverado & GMC Sierra Double Cab Trucks by Skar Audio Compatible with 2014-2018 Chevrolet Silverado & GMC Sierra Double Cab Trucks Dual 12" Sealed Subwoofer Enclosure with Down-Firing Design | Air Space: 1.15 Cubic Ft Finished in a Premium Automotive Grade Black Trunk-liner Carpeting | Fits Under the Rear Seat in Cab - No Modifications Required Subwoofer Cut-out: 11.125" | Subwoofer Mounting Depth: 5.125" Features Independent Wiring Terminal Cups with 12-Gauge OFC Speaker Wire Internally Pre-soldered