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. 
Fi Audio BTL-4 15"  Subwoofer Box
Outside Dimensions- 16H x 34W x 24D
Tuning- 33Hz
Net Volume-     4.43 cuft
Construction- 3/4” Birch
Baffle Thickness- 2.25"
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 15" woofers, user caution advised*