i will be getting 4 rockford punch hx2's and me and my friend are gunna make my box. its our first one so i was thinkin of makin it sealed but ive hearad ported boxes are much louder and im goin mostly for spl, how much harder are ported boxes to make then sealed, and if you could help me with this, they recommend 2 cu ft per sub for a ported box but wont the ports affect that and how do u (tune) your box or how do u determain the length and width of the tube? sorry this is long im just lookin for some guidence