Check the listing for details. TRU SPEC Prefab Single 8" Subwoofer Enclosure Sub Box. Condition: New. Listed at 139.99 USD. ***DUE TO THE CURRENT HIGH VOLUME OF HOLIDAY ORDERS, OUR LEAD TIMES ON TRU SPEC ENCLOSURES WILL HAVE TO TEMPORARILY BE INCREASED 14 DAYS (10 BUSINESS DAYS).***Every Tru Spec enclosure is computer designed, CNC cut, and assembled inhouse at GPcarAudio. This Tru Spec single 8" subwoofer enclosure is 0.65 cubic feet AFTER displacements including a displacement of 0.08 cuft per woofer. The internal volume and port area of this enclosure is versatile to most 8" subwoofers available on the market as long as your cutout is 7.45" or less, We do a 35hz tune which will give you a wide musical playable bandwidth while still being able to hit the lows nicely. This will Truly be one of the best sounding prefabs you will find.MADE IN THE USATRU SPEC PREFAB DUAL 8 with double flush baffleMaterial: 0.75" MDF Specifications:Box External DimensionsWidth × Height × Depth20.00" × 10.50" × 11.26"Material Thickness0.75"Net Internal Volume0.65 ft3Tuning Frequency35 HzPort Area9.00 inch2 Cutout Diameter: 7.45"Flush Trim Diameter: 9" Also fits the following 8" Subwoofers and are close to recommended specifications:DC Audio M3 8" SubwooferCT Sounds Meso 8"Skar VD 8" Skar SDR 8"Skar SVR 8"Skar EVL 8"DS-18 Elite Z 8"And many more