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<blockquote data-quote="JohnBlayz142" data-source="post: 1515488" data-attributes="member: 564752">I am about to begin constructing a box for my RE SX15. I&#039;ve built many boxes over the last couple years, all ported, but this one is my first attempt at a &quot;CRX&quot; style box with Precision Ports rather than a slot port. The box will be +/- 4cf, with +/- 35hz tuning with 3 17&quot; long, 4&quot; round ports.What I want to know is, just how big do I have to build the box to keep tuning right around 35hz? Also, I may plug one of the ports if I feel the desire for a lower tune while driving around.The only reason I am asking is because I hear there may be a discrepancy in WinISD with round ports, or something like that, so I&#039;d just like to make sure.According to my calculations, 3 17&quot; long, 4&quot; round ports will require me to build the box about 4.1cf after all displacements. Is this right? Thanks!John</blockquote>

[QUOTE="JohnBlayz142, post: 1515488, member: 564752"] I am about to begin constructing a box for my RE SX15. I've built many boxes over the last couple years, all ported, but this one is my first attempt at a "CRX" style box with Precision Ports rather than a slot port. The box will be +/- 4cf, with +/- 35hz tuning with 3 17" long, 4" round ports. What I want to know is, just how big do I have to build the box to keep tuning right around 35hz? Also, I may plug one of the ports if I feel the desire for a lower tune while driving around. The only reason I am asking is because I hear there may be a discrepancy in WinISD with round ports, or something like that, so I'd just like to make sure. According to my calculations, 3 17" long, 4" round ports will require me to build the box about 4.1cf after all displacements. Is this right? Thanks! John [/QUOTE]

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