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<blockquote data-quote="Umbra" data-source="post: 8464673" data-attributes="member: 658055">Sundown&#039;s recommendation for ported volume is how much internal volume the box will have after accounting for displacement. The displacement is the space the driver takes up, the space the port takes up, and the space the walls and bracing take up You&#039;ll subtract these from the gross volume to get the net volume.Figure out the dimensions for the area you want to stick the box.Download the Torres Tuning Calculator and play around with it to find a design that works for you: <a href="http://www.stevemeadedesigns.com/board/topic/38791-torres-box-tuning-calculator-updated-818/" target="_blank">Torres&#039; Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum</a>Torres does a ton of calculations on the fly and accounts for all the displacements you enter.As far as port area goes you&#039;ll want something like 12-16 square inches per cubic foot - too little and you&#039;ll get port noise.As far as port ratio goes you&#039;ll want something like 1:4 or less - too narrow and you&#039;ll get also get noise.If you want an A+ design there are a bunch of designers on here that&#039;ll sell you a custom design plans for a modest fee.</blockquote>

[QUOTE="Umbra, post: 8464673, member: 658055"] Sundown's recommendation for ported volume is how much internal volume the box will have after accounting for displacement. The displacement is the space the driver takes up, the space the port takes up, and the space the walls and bracing take up You'll subtract these from the gross volume to get the net volume. Figure out the dimensions for the area you want to stick the box. Download the Torres Tuning Calculator and play around with it to find a design that works for you: [URL="http://www.stevemeadedesigns.com/board/topic/38791-torres-box-tuning-calculator-updated-818/"]Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum[/URL] Torres does a ton of calculations on the fly and accounts for all the displacements you enter. As far as port area goes you'll want something like 12-16 square inches per cubic foot - too little and you'll get port noise. As far as port ratio goes you'll want something like 1:4 or less - too narrow and you'll get also get noise. If you want an A+ design there are a bunch of designers on here that'll sell you a custom design plans for a modest fee. [/QUOTE]

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