Check the listing for details. TRU SPEC Prefab Single 6.5" Subwoofer Enclosure Box Sundown SA / DC M3. Condition: New. Listed at 119.99 USD. 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 SINGLE 6.5: Sundown SA-6.5"/ DC M3 6.5" with double flush baffleMaterial: 0.75" MDF Specifications:Box External DimensionsWidth × Height × Depth16.00" × 9.00" × 8.30"Material Thickness0.75"Net Internal Volume after all displacements0.30 ft3Tuning Frequency40 HzPort Area4.00 inch2Cutout Diameter: 5.95"Flush Trim Diameter: 7.50" Also fits the following 6.5" Subwoofers and are close to recommended specifications:Sundown SA 6.5" (this enclosure is spot on to Sundown's suggested specs after displacements.)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" RVEAND MANY MORE!