BanginOnABudget

i have 2 questions. the first question is, if i have a port 15.13 inches deep and 6 inches wide, how long does it have to be for it to be tuned to 28 hz? (slot style) second, when im finding the internal displacement of a subwoofer box do i just go around the port, or include it, or what? any help is appreciated...thanks!

HU - alpine, first and only. Speakers(&mid-bass) Alpine or RF, cus i thought pioneer was junk. Subs - 5% kicker, 25% MA, 30% Hifonics, 40% RE amps...SA or HIFO wire, dosent really matter to me as long as it not F*cking lower than 24 gauge for speakers, 4 gauge for any amp minimum, and 10 gauge(wish precise trmming) for subs(damn you hifonics hfi and your 16 gauge terminals) processor - soundstream cap - rockford power source - o'rileys SuperStarts' i get for $20 when theres a sale MP3 player over CD also, thanks to pyramid for making the worlds largest, ugliest, paper weights.