ummmm... actually if u just build a box regardless, if you don't know what u r doing you won't be satisfied. you have to start planning... what box is for u? sealed, ported, or bandpass. besides these three designs listed here believe me there are more designs out there, like a corner loaded horn, or even a quasi sixth order bandpass. easiest to build is a sealed. go here for a deeper understanding... ( www.diysubwoofers.org ) have fun! DIYers rule!!!