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Help w/Precision ports
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<blockquote data-quote="sak384" data-source="post: 4808517" data-attributes="member: 594627"><p>I am in the process of building a ported box for (2) 12" JBLGTIMKII's using precision ports. Included with the ports is a formula to calculate the length needed.</p><p></p><p>.................2</p><p></p><p>Lv=8466.4R</p><p></p><p>....._______.......-1.463R</p><p></p><p>..................2</p><p></p><p>...... (Vb)Fb</p><p></p><p>Lv=port length in inches</p><p></p><p>Vb=volume of box in cubic feet</p><p></p><p>Fb=tuning frequency</p><p></p><p>R= radius of port (1/2 of port diameter)</p><p></p><p>My subs call for 2.25 cubic feet,tuned to 39hz, with 4" port length of 13.31"</p><p></p><p>Before i cut these ports ii would like to double check and this does not work for me. Anyone understand this...</p><p></p><p>please ignore the dots used as spacing cause the editor adjusts them all the way over</p></blockquote><p></p>
[QUOTE="sak384, post: 4808517, member: 594627"] I am in the process of building a ported box for (2) 12" JBLGTIMKII's using precision ports. Included with the ports is a formula to calculate the length needed. .................2 Lv=8466.4R ....._______.......-1.463R ..................2 ...... (Vb)Fb Lv=port length in inches Vb=volume of box in cubic feet Fb=tuning frequency R= radius of port (1/2 of port diameter) My subs call for 2.25 cubic feet,tuned to 39hz, with 4" port length of 13.31" Before i cut these ports ii would like to double check and this does not work for me. Anyone understand this... please ignore the dots used as spacing cause the editor adjusts them all the way over [/QUOTE]
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