Check the listing for details. TRU SPEC Prefab Dual 6.5" Ported Subwoofer Enclosure Sub Box. Condition: New. Listed at 159.99 USD. Every Tru Spec enclosure is computer designed, CNC cut, and assembled inhouse at GPcarAudio. This Tru Spec dual 6.5" subwoofer enclosure is 0.6 cubic feet AFTER displacements including a displacement of 0.06 cuft per woofer. The internal volume and port area of this enclosure is versatile to most 6.5" subwoofers available on the market as long as your cutout is 5.95" or less, We do a 40hz tune which will give you a wide musical playable bandwidth for 6.5" drivers. This will Truly be one of the best sounding prefabs you will find.TRU SPEC PREFAB Dual 6.5 with double flush baffleMaterial: 0.75" MDF Box External DimensionsWidth × Height × Depth20.00" × 9.00" × 11.66"Material Thickness0.75"Net Internal Volume0.60 ft3Tuning Frequency40 HzPort Area8.00 inch2Cutout Diameter: 5.95"Flush Trim Diameter: 7.50" Also fits the following 6.5" Subwoofers and are close to recommended specifications:DC Audio M3 6.5" Subwoofer (this enclosure is spot on to DC's suggested specs after displacements.)CT Sounds Meso 6.5" subwoofer CT SOunds Tropo 6.5" subwoofer Massive Hippo XL 6.5" Subwoofer DS-18 Elite Z 6.5" Subwoofer Rockville W6k9 6.5" Subwoofer Skar EVL 6.5" Subwoofer Audiopipe TXX BDC4 6.5" Subwoofer Ampere Audio AA 6.5" RVE