length of port, blow through box?

anyone know how to figure out the length of the port for a blowthrough style box? I want to learn how to build them. Everyone I know says build a sealed box their better. I just want to learn how to build different boxes. any help would be great thanks.fabricating just for entertainment

 or how to figure out how wide or tall it should be?fabricating just for entertainment

building a proper blow through is not for a novice. Since you do not know how to even figure out how to tune an enclosure properly I would not recommend designing a ported blow through.

yup, know what your sayin. it ain't easy, but it damn sure ain't rocket science. i have built plent y of sealed enclosures for friends and they are easy. just tryin to find something different to do. ported isn't tough. built a few but always had round ports never square. thanks for the insight though. that's the same thing i was told by a guy i used to street race with. he works for the local car audio shop here.fabricating just for entertainment

An enclosure is an enclosure.  What's so special about a so-called blow through box other than the enclosure sits in a truck bed?  Calculate it just like any other vented system if that's what's appropriate.Support the12volt.com