BLACK 12" DUAL PORTED SUB BOX, FITS SILVERADO EXTENDED & CREW-CAB 2019-2025 SPECIFICATIONS: -CUTOUT DIAMETER: 11 1/8" -TOTAL AIR VOLUME: 1.76 CUBIC FT. -TUNING FREQUENCY: 36-Hz -1 SLOT PORT (DIMENSIONS: H-2 1/2” W-5 1/2” L-10”) -WEIGHT: 46 LBS. -MOUNTING DEPTH: 6 1/2" DIMENSIONS: -HEIGHT: 9 1/2” -LENGTH: 49 1/2" -DEPTH: 17" CONSTRUCTION: -5/8" MDF WOOD -GLUE -2" STAPLES +MAINLY SEALED WITH HIGH QUALITY SILICONE+ INSTALLATION: -FITS UNDER REAR SEAT -DOWN FIRING NOT ALL SUBS WILL FIT DUE TO THE CUTOUT DIAMETER OR MOUNTING DEPTH SO PLEASE CHECK THE DIMENSIONS TO MAKE SURE THIS BOX SUITS YOUR SUBS