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Car Audio Help
Enclosure Design & Construction
port length and construction
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<blockquote data-quote="evo2k3" data-source="post: 129193" data-attributes="member: 546246"><p>ok i got the equation for port length from jl's site to work....but i get 26.6" the equation reads something like this:</p><p></p><p>L= (Av * 1.84x10^8 * 0.159^2) / ( F^2 * V)</p><p></p><p>Av = cross sectional area of port</p><p></p><p>F = tune freq</p><p></p><p>V = volume in cubic inches</p><p></p><p>now they say when you do multiple ports you DO NOT add the cross sections, but divid the volume by the number of ports and use that as the volume. so for my 3--3" ports i used 0.646 *12^3 in^3 as the volume and 7.07 as the cross section....did i do this right?</p><p></p><p>i did the same with the 1.75*14 slot....24.5 cross section and 1.937 volume....what am i doing wrong?</p></blockquote><p></p>
[QUOTE="evo2k3, post: 129193, member: 546246"] ok i got the equation for port length from jl's site to work....but i get 26.6" the equation reads something like this: L= (Av * 1.84x10^8 * 0.159^2) / ( F^2 * V) Av = cross sectional area of port F = tune freq V = volume in cubic inches now they say when you do multiple ports you DO NOT add the cross sections, but divid the volume by the number of ports and use that as the volume. so for my 3--3" ports i used 0.646 *12^3 in^3 as the volume and 7.07 as the cross section....did i do this right? i did the same with the 1.75*14 slot....24.5 cross section and 1.937 volume....what am i doing wrong? [/QUOTE]
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