Subwoofer Box Built for the Below Listed woofers. Designed to optimize the performance of your  woofers. Built to last with quality in mind. These will outperform the standard prefab in sound and durability. 
4 Sundown Audio X 12's Subwoofer Box
Outside Dimensions- 34"W x 17"H x 38"D
Tuning- 47Hz
Net Volume-     3.66 cuft Sealed/ 4.53 cuft Ported
Construction- 3/4”  Birch
Baffle Thickness- 1.5"
Terminal Type- SMD 1 Channel Heavy Duty Speaker Terminal (Grade 8) (3/4" PVC Black) (Round)
Outside Finish- Bare Wood or Bedliner
Inside Finish- Bare Wood
FREE SHIPPING! LIFETIME WARRENTY! QUALITY GUARENTEE! 
****BUILT TIME- 2-6 WEEKS FROM TIME OF ORDER!*****
Enclosure is Based on Reccomended Manufature Specs
*May work for other 12" woofers, user caution advised*