Port Size 4 Wedge

I am runing 2 15W3-D4s. The box has 3.3 ft to 3.5 ft of air for each 15.
( They are walled off from each other.)

For each side of the Box ( one 15) I have room for :
one or two 3" ports no longer then 24" each  
Or
One 6" Port no longer then 12"

(Anything else would be is blocked off.)

Can any one tell me how many ports & how long they should be, to get the lowest bass 

Thank you

El Sandman

Alright, my comp crashed on me as I was finishing this post...grrrr. So here's version 2.

The JL site recommends something along the lines of 2 - 3" ports 11.6" long. By that, we're getting a port  volume around 164 cu. inches PER DRIVER. The rest of their tech data isn't exact, but follows pretty well along those lines. I threw it into winISD, and it looks like 2 ports, 11.2 inches long are going to net you a tuning around 22 Hz. That should really thump! The longer the ports you make, the lower the tuning. But you will lose response. It looks like a 16Hz tuning will get you like 3dB or so less than a 22 Hz tuning.You don't really start losing dB hard until about the 21-22Hz mark, so it looks like The JL sheet has exactly what you want. The most output down the absolute lowest you can get is going to be 2-3" @ 11.6" or so. (In other words, I just spent 20 minutes proving that the guys at JL really do tell you the best box size to use ). If you're tuning for SPL, you can probably go up with the tuning point without losing much, but you said you wanted the really LOW bass...so this is what you get.  ;)