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Message: <blockquote data-quote="appleyard" data-source="post: 350835" data-attributes="member: 7751">the larger the box, the more efficient the sub gets which translate to lower power requirement to reach max. linear excursion (Xmax). So if you have small power amp and plenty of boot space, go with big box. Otherwise if space is premium, you need bigger power amp.Remember SPL is all about moving the air & not power.A port is a resonator (helmholtz) which is the same as passive radiator (sub) when coupled to a sub. So the bigger the port area, the louder it is going to be. Just imagine bigger port area as 'bigger speaker/driver'. It is the port AREA that is important and don't confuse it with port size or volume.yep, applicable to all subs.How to use WinISD? Read the Help section.point to note ... if you are not familiar with ported box design, don't do it. You will end up making the sub sound worse. Plus the damage to the sub when it unloads at lower than port tuning freq.</blockquote>

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