Check the listing for details. TRU SPEC Prefab Dual 8" Ported Subwoofer Enclosure Box Sundown SA 8". Condition: New. Listed at 169.99 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).***Tru Spec Prefabricated enclosures are simple, straight to the point, subwoofer specific enclosures dialed in precisely to manufacturer's specifications after displacements. These subwoofer specific enclosures will be versatile to many other subwoofers as well, so you do not have to use the noted driver on the enclosure, see list below of suitable drivers that will also work well in this enclosure. MADE IN THE USATRU SPEC PREFAB DUAL 8: Sundown SA 8" with double flush baffleMaterial: 0.75" MDF Specifications: Box External Dimensions Width × Height × Depth 26.00" × 11.00" × 14.79" Material Thickness 0.75" Net Internal Volume 1.30 ft3 Tuning Frequency 35 Hz Port Area 18.00 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