Need help with box and ports

[Sspider 5,000+ posts]

Making a ported box for my 2 (only have one right now) power hx2. here are my measurments so far.

14h x 36w x 18d = 5.25 ft3 am i right?

after displacement, we talking roughly 2.5 per sub right?\

No on to the ports, rockford give dimensions for the ports but i dont understand them.

here they are, keep in mine that they for 2.50 ft3 per sub.

they have a tuning frew for either 35, 40, or 45 hz which is better??

for the 35 it goes like this(will list that only, and if a dif is better, let me kno)

tuning freq - 35hz

f3 - 29 hz (wuts this?)

port area in sq in - 23

port length in in - 16

port area in round pvc - (2) 4"

port length - 17.8

those are it, so i have to make 2 ports with a 4", i got that, but wut length is it?

and are my dimensions g0od for the ports and stuff.

please help, thank you

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[zorak46and2 10+ year member]

rockford's instuctions are pretty well incrypted they only want dealers working on their merchandise, but from glancing at your specs they look alright, but i would not actually know for 100% unless i saw the box and the way you are building it.i would go with 35 and if you really don't know what size ports to install go ask a shop they know everything...but take the box with you to avoid any confusion

 

[Sspider 5,000+ posts]

I'm making evrything to specs, volume and port size wise, but the shape is different so that it fits in the trunk.

As for the frequency, dats wut i dont kno, and the specs for the ports are given, i just dont kno wuts wut. and if my volume calculations are correct.

 

[imral3 10+ year member]

go to this site... it contains many different audio calculators... including a PORT calculator - http://www.wssh.net/~wattsup/audio/

p.s.- i got this website from another member's post... thanks "maylar"