Never ever buy a prefab ported box. Ported enclosures have several variables that affect their final performance, and the chances of you stumbling across a pre-fab ported box with the right combination that is suited to your specific sub is remote, at best. For sealed systems, basically you just need the right internal volume, decent prefab boxes are generally fine. But ported boxes, well just dont make that mistake again. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif