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<blockquote data-quote="jwjordan322" data-source="post: 8279599" data-attributes="member: 661721">OK, so this weekend I plan on building a ported box for my sub.I have a Kenwood kfcxw12, and specs are found here..<a href="http://www.crutchfield.com/App/Mobile/App/Product/Item/Specs.aspx?i=113XW12&amp;amp;tp=111" target="_blank">Kenwood Excelon KFC-XW12 12&quot; 4-ohm subwoofer at Crutchfield.com</a>... I have a couple questions. I currently have a sealed box.- how do I determine what I should tune my box port to? In looking for loudness that&#039;s not in any way harmful to the sub itself but the most bang possible and most efficient.- and I&#039;ve tried a couple calculators for ported boxes, and what does port length refer to after filling in volume, tuning frequency, port height/width,- I see 2.68 is reccomended sq/f would be going a little bigger to maybe 2.3 have negative effects or no?- and in a nutshell does the size of the port determine the tuning fq?This will be in the trunk of a cobalt facing up, port possibly facing frontwards toward the cabin unless that&#039;s not recommend.Thanks so much in advance!</blockquote>

[QUOTE="jwjordan322, post: 8279599, member: 661721"] OK, so this weekend I plan on building a ported box for my sub. I have a Kenwood kfcxw12, and specs are found here..[URL="http://www.crutchfield.com/App/Mobile/App/Product/Item/Specs.aspx?i=113XW12&tp=111"]Kenwood Excelon KFC-XW12 12" 4-ohm subwoofer at Crutchfield.com[/URL]... I have a couple questions. I currently have a sealed box. - how do I determine what I should tune my box port to? In looking for loudness that's not in any way harmful to the sub itself but the most bang possible and most efficient. - and I've tried a couple calculators for ported boxes, and what does port length refer to after filling in volume, tuning frequency, port height/width, - I see 2.68 is reccomended sq/f would be going a little bigger to maybe 2.3 have negative effects or no? - and in a nutshell does the size of the port determine the tuning fq? This will be in the trunk of a cobalt facing up, port possibly facing frontwards toward the cabin unless that's not recommend. Thanks so much in advance! [/QUOTE]

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