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Message: <blockquote data-quote="xtullyx" data-source="post: 5109875" data-attributes="member: 602914"><p>Soo.. im thinking of building a box for an alpine type r 15" or having twisted on here build one for me.. but if i decide ultimately to build one myself what calculations and info do i need? i have my trunk dimensions, if i build a box its going to be a basic rectangle but i dont know how to calculate the size of the port...  the port size recommended for the type r is 1.3-3.0. the box i have in mind is width x height x depth = 20 x 17 x 20= 3.2 cu ft. thats the internal cu ft without taking out sub cubic feet.  do u think thats to big or just right? and what size and shape should my port be? also the thickness of the wood is 5/8, will that be thick enough?</p></blockquote><p></p>

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