I have 2 of these subs. Just wondering what sort of box I should build for it. I have a crappy sealed right now and it's doing the subs no justice. I have BassBox pro and I've looked at RE's http://www.reaudio.com/speaker_box/LPort_Box_Calc.html and I have no idea what to put into the parameters. Anyway, wondering what kind of box I should build for it. I listen mostly to rap BTW. Here's a pic of the "specs". Also, are these double 2 ohm or dual 4ohm? Somewhere it said dual 4 but i think the thing says 2ohm. Please help. This box will be going into an 01 Impala btw.