Alpine 1240D vented box

Alright...I have my spl box...I am trying to decide what I want to do for my daily box..one that will hit my low FQ not just 52db+ for spl   I am thinking of tuning at about 32 hz as this is what I tune most of my street beat boxes at.  I am trying to decide between these port deminsions    both come to 32hz                (2 x 14.5 x 31.3)  or  (1 x 14.5 x 13)      any other recomendations are welcome    the 2 inch port should give me a better sound from the ports...as I respect SQ as well as good SPL    but like I said this is not a SPL box..only for street beat,  enough to be heard a block away.  I am running only 2 for on the street powered by a alpine 1507,  but I might be running 6 when I compete.   the 2 was no where close to what I need only 152.3 DB  I need 155+  I have the feeling (6) 12's should do 

But I need 32hz for 2 subs   space is plentiful, power is plenty, boom is needed