Need help choosing a subwoofer

[basshead7890 128]

$500 is my budget including shipping and in a 4 to 4.5 cubic feet box powered by a hifonics brz2400.1d . I was looking at the 15" btl, 15" xcon, and the 15" zcon for $30 more. I'm going for spl, i just want it to be loud.

also i look at 2 ssd 15 is a slightly smaller box then recommended.

what are you suggestions/recommendations ?

Edited June 29, 2011 by marq7890