I have a ported box that is 3 ft long, 17 inches deep, and 13 inches wide. The subs i am planning on using are the soundstream Arachnids that are 12" and 4ohm with 250 rms. the model # is (sw-12se). the amp i think i am going to use is the soundstream picasso 2 channel which has 180 watts x 2...