Need Some Help With Ports

[kdemarcus]

i have a 18 and making my own box and i want to run about 30hz but i dont know how big that is i have no idea who to do this shit i need some help please

[FCsteve]

what kind of 18 ?

[Decaf]

what make, model 18

car, amp

size of box/max dimensions ?

[kdemarcus]

its a rockford 18in i have a 980 amp and a honda accord

[Decaf]

max dimensions?

[kdemarcus]

what is that?

[Decaf]

that max size, (length height depth) that you can fit a box into ur trunk

[kdemarcus]

the box i want to make well be 3cubs but my truck is about a foot and a half high and about 3 and half wide and about 5 to the back sets i dont want to go no crazy right on the dot box but i want it 2 hit hard i think i might go with a closed box because u can put more power to the sub that way what do you think??

[Decaf]

what model rf 18"

[gotFI?]

box calculator here http://www.reaudio.com/speaker_box/LPort_Box_Calc.html