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<blockquote data-quote="Jeffdachef" data-source="post: 8329146" data-attributes="member: 650438">measure your max dimensions and calculate the Gross cubic feet of your enclosure after accounting in 3/4 mdf thickness(.75) <a href="http://www.the12volt.com/caraudio/boxcalcs.asp#rec" target="_blank">Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume</a>Whatever you get, subtract 20-25% off(roughly how much cubic feet the port will take up) and subtract sub woofer displacement whichis .07(x2) according to the manual.&nbsp; Afterwards will be your usable NET cubic feet.For example: a 42W x 20H x 17D enclosure will have 7.2 gross cubic feet, subtract 20% of it and you&#039;ll end up with 5.38 cubic feet then subtract .14 for sub woofer displacement and you&#039;ll end up with 5.24 cubic feet of usable airspace. This is just a proper ballpark, after you finish your design you&#039;ll have to recalculate everything again to get proper specs but it should be very close still.</blockquote>

[QUOTE="Jeffdachef, post: 8329146, member: 650438"] measure your max dimensions and calculate the Gross cubic feet of your enclosure after accounting in 3/4 mdf thickness(.75) [URL="http://www.the12volt.com/caraudio/boxcalcs.asp#rec"]Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume[/URL] Whatever you get, subtract 20-25% off(roughly how much cubic feet the port will take up) and subtract sub woofer displacement which is .07(x2) according to the manual. Afterwards will be your usable NET cubic feet. For example: a 42W x 20H x 17D enclosure will have 7.2 gross cubic feet, subtract 20% of it and you'll end up with 5.38 cubic feet then subtract .14 for sub woofer displacement and you'll end up with 5.24 cubic feet of usable airspace. This is just a proper ballpark, after you finish your design you'll have to recalculate everything again to get proper specs but it should be very close still. [/QUOTE]

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