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Message: <blockquote data-quote="BOOMINGRANDPA" data-source="post: 8639299" data-attributes="member: 671921"><p>thats whats what wins program said i just did it online port calc it came up like 42.5hz but still.. they never subtract sub disp because they don't know what sub you have, many don't even subtract the port... here's port calc just put in box size after sub disp, click slot port sqaure or round put in port area (4x5" or whatever) and tuning u want,  it'll show u how long port has to be to get to tuning u want. so 33hz that port would have to be 27" long which means box would have to be much larger just to maintain the 1.5cf <a href="http://www.mobileinformationlabs.com/HowTo-1Woofer-Box-CAL%20Port%20lenth%201.htm" target="_blank">Port Length Calculator</a></p></blockquote><p></p>

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