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<blockquote data-quote="Mike Caldwell" data-source="post: 216454" data-attributes="member: 170"><p>As David said for any modern'ish 18 two 4 inch ports are not going to work.</p><p></p><p>A quick run of the numbers figuring your box with 10 cubic feet of internal volume the two four inch ports</p><p>will just work with the 151's, that's a 40hz tuning and a port length of 1 1/4 inches.</p><p></p><p>With an Eminence Sigma or bumping up to a Definimax they want at least four four inch ports</p><p>about 5 1/2 inches long.</p></blockquote><p></p>
[QUOTE="Mike Caldwell, post: 216454, member: 170"] As David said for any modern'ish 18 two 4 inch ports are not going to work. A quick run of the numbers figuring your box with 10 cubic feet of internal volume the two four inch ports will just work with the 151's, that's a 40hz tuning and a port length of 1 1/4 inches. With an Eminence Sigma or bumping up to a Definimax they want at least four four inch ports about 5 1/2 inches long. [/QUOTE]
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