Originally Posted by syntac
what type of material are most sub cases made out of?
MDF (medium density fiberboard) is one of the better box building materials. You have to calculate the port size with a bunch of formulas for a ported box, which can get messed up if you are off by an inch, so if you want a ported box, you might want to get a go0d audio shop to build it. Do not buy a pre-fabricated box! they suck, b/c they are not built to your speakers' specifications, build your own.
The square subs will hit harder, b/c a square has more cone area than a circle does. I have hear one 12" in a ported box that sounded damn loud, and it was only pushed by a RF punch power BD1ooo which wasn't even maxing out the sub! Definitly a go0d buy! O and you WILL have to buy a nice amp to push them hard, so be ready to spend a go0d amount of money to get a decent amp with enough RMS power to push both subs to the max. Remeber, its better to have to0 much power than not enough, b/c without enough power, the amp sends out to0 much distortion to the speakers, which causes them to fail prematurly.