Newbie questions. Software and and aeroports

[soberfornow 10+ year member]

I would like to build a box, but I have only ever built sealed boxes. I would like to build one and using a aeropport. Can somebody suggest on what program i should be buying. I don't want to spend something really expensive. Are there any programs that are free? . IF not I will buy. Looking to build something for a 15" subwoofer. Infact I have a 15" kicker comp right now that is sealed. I would like to build a box with it, but to see how i like the sound of ported. If it sound great I will build another box for a better set up. Thanks for any suggestions.

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[soberfornow 10+ year member]

Anyone?

 

[mylows10 5,000+ posts]

precision port has a calculator for their ports you can use