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<blockquote data-quote="IgnoreMe" data-source="post: 4126806" data-attributes="member: 551352">26.46close enough. the difference is usally because winisd will change the tuning (if you go back to the box tab) to like 34.8hz or something which will change the length and make them somewhat different.so in this case you would use&nbsp; 26.5&quot; (always easier to go to the closest 1/4&quot;, hell you can go to 1/8&quot; if you want, but i usually dont) and be done with it. now if this is going to be a standard slot port that uses the side of the box as 1 side of the port then you also need to subtract half of the port width from the port length.in our example, you have a port length of 26.5 and a width of 4&quot;. so your port length needs to be 24.5&quot;. this is called end correction and is used because having only one flange that is open (ie one side) causes the air to follow the side of the box that makes up the other side of the port. so you have to shorten the calculated port length, to get the physical port length. the subwoofer will &quot;see&quot; the calculated port length when its all said and done.hope i didnt confuse you.</blockquote>

[QUOTE="IgnoreMe, post: 4126806, member: 551352"] 26.46 close enough. the difference is usally because winisd will change the tuning (if you go back to the box tab) to like 34.8hz or something which will change the length and make them somewhat different. so in this case you would use 26.5" (always easier to go to the closest 1/4", hell you can go to 1/8" if you want, but i usually dont) and be done with it. now if this is going to be a standard slot port that uses the side of the box as 1 side of the port then you also need to subtract half of the port width from the port length. in our example, you have a port length of 26.5 and a width of 4". so your port length needs to be 24.5". this is called end correction and is used because having only one flange that is open (ie one side) causes the air to follow the side of the box that makes up the other side of the port. so you have to shorten the calculated port length, to get the [I]physical[/I] port length. the subwoofer will "see" the calculated port length when its all said and done. hope i didnt confuse you. [/QUOTE]

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