Help with round ports?

[psych0ticnemes1 5,000+ posts]

i want to use these: http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=3&ObjectGroup_ID=143&filter=external+flare&raid=25&rak=PortTubes&wt.sv2

but not sure how much port area, volume, etc. i would need...

http://www.carstereo.com/help2/Articles.cfm?id=31

says i should have 2 ports, 3.75" wide and 3.33 long in order to port an 8 cube box to 35htz... is this enough port area/volume???

IM me if it's easier: psych0ticnemes1s

Thanks

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[nissanrider06 10+ year member]

3.14r^2 will give port area, and u just add er up, if ur looking for how much u will need and port length,would have to look up im not sure, what subs?

 

[psych0ticnemes1 5,000+ posts]

inf ref 12's, 4 of them