Phoenix Gold Phorum

im new to here and i apologize for the first thing i do is being making a request. i have this sub and i really need help on figuring out a box. i called phoenix hoping to get a different box spec but he didnt seem very interested into takin the time i dont know why. Anyways i was wondering about building a box for sql, i want loud but also for it to sound good at the same time and the specs call for 4inch circle ports and that dont seem like it would let a sub with this much power do its potential with such a small opening to breath. i wanted to go with the 2.75 enclosure and the specs say the 25hz is the musical tuning but i wanted to go with a rectangle port instead. if anyone could help me it will be greatly appreciated and ill post pics as soon as i get it built.

Also to introduce myself, my name is Josh and hello all