Noob needs woofer advice =D

[spellwords]

I am having a b of a time figuring this program out... all it is, is a box size/volume calculator correct?

[revboden]

it's a bit more than just a volume calculator, check this out. WinISD Pro Tutorial and Download (A detailed guide on how to use WinISD Pro) - Home Theater Forum and Systems - HomeTheaterShack.com

[chris661]

To be honest, I think I'd consider buying something like this. For $100, you'll be hard pressed to buy speakers, amps, wood, veneer etc to match it (the finish isn't likely to be as good unless you're experienced at such things). It won't be matched specifically to what you want from it (won't go near 25Hz -are you sure?-, to name one setback), but for the sake of an easy life, I'd consider that. No need to read further if you decide to buy commercial gear.

Still with me? Good.
The DIY side allows you to choose drivers and cabinet alignments that will do exactly what you want to do. It won't be the cheapest or quickest option, as there will be lots of agonising over which driver/amp combo to use, whether or not the extra inch of height is worth the extra Hz extension it produces, and then experiementing with stuffing/lining the cabinet, and adding bricks in case there's too much cabinet volume.

So,
The Subwoofer DIY Page
DIY Audio Articles
DIY Audio Articles
THOR - subwoofer
Read the related links on those pages, ask questions if you don't understand.

Chris