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<blockquote data-quote="Max Warasila" data-source="post: 148023" data-attributes="member: 3845">Re: No compromises front loaded double 18” cabSo I&#039;ve been doing all sorts of math for this box today (since I&#039;m building a variation on it to compliment the DIY Mid Hi) and I&#039;ve been having a super difficult time determining why the standard math doesn&#039;t work for this box. Every calculator, program - hell even my own calculations by hand - say that two ports with an area of 43.5 square inches each should be 25&quot; long for a 32Hz tuning. However, every design I&#039;ve seen like this has a port length more along the lines of 10&quot;, which is what the calculations say would work correctly for a single port.&nbsp;What gives? What magical formula lets the effective port length for boxes of this type to be around 10&quot;, despite all math and reason? Even if the math is done for a single port, the length is ridiculous - 28&quot;! I&#039;m sorely confused at this point.</blockquote>

[QUOTE="Max Warasila, post: 148023, member: 3845"] Re: No compromises front loaded double 18” cab So I've been doing all sorts of math for this box today (since I'm building a variation on it to compliment the DIY Mid Hi) and I've been having a super difficult time determining why the standard math doesn't work for this box. Every calculator, program - hell even my own calculations by hand - say that two ports with an area of 43.5 square inches each should be 25" long for a 32Hz tuning. However, every design I've seen like this has a port length more along the lines of 10", which is what the calculations say would work correctly for a single port. What gives? What magical formula lets the effective port length for boxes of this type to be around 10", despite all math and reason? Even if the math is done for a single port, the length is ridiculous - 28"! I'm sorely confused at this point. [/QUOTE]

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