need help building box

[SQnissan 0]

i have a 15' Q. want a box that will get really loud. recamended size is 2.6- 4 cu ft. @ 28-33Hz. with 12- 16 sq. in. of port per cu ft. would a larger port be better than a smaller one?? i was thinking of doing 4 cu ft. @ 35 Hz. with a 6" x 10.5" port. how long would i need to make the port to tune at 35Hz??

[Fi Car Audio 64]

Depending on how many sides of the enclosure you are using (Ill assume free standing) your port would be right at 28" long. 4 cuft net after port and driver displacement. If you use 1 wall, it will shrink down 1-2" in length. 3 walls, shrinks 3".

Thanks,

Scott