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Question on How to Measure Port length-2 diff. designs
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<blockquote data-quote="PowerNaudio" data-source="post: 2730444" data-attributes="member: 561215"><p>the reason you measure the port that way is not because of port end correction. is because the port will be in the middle of the enclosure with a sub on each side. the subs move the mass of air from each side, so you add the port length with the dimensions of one side only, if you where going to do it the way you suggested the port length would be too long and incorrect.</p><p></p><p>also on the T port drawing that i made youll notice there is a center deflector, these are necessary, to help the air flow properly instead of having it clash against the back of the wall, which will cause turbulence and make the port perceptively longer.</p><p></p><p>port correction is subtracted from the port before you draw it, its done while you calculate the port length.</p><p></p><p>so if the port is drawn or built up as 18.75 and is 3" wide to figure the tuning you would subtract 1.5" to the 18.75" of port length.</p><p></p><p>if you are calculating port length and your port calculations equal L:18.75" x W:3" , to account for end correction, you'll add 1.5" of port length.</p></blockquote><p></p>
[QUOTE="PowerNaudio, post: 2730444, member: 561215"] the reason you measure the port that way is not because of port end correction. is because the port will be in the middle of the enclosure with a sub on each side. the subs move the mass of air from each side, so you add the port length with the dimensions of one side only, if you where going to do it the way you suggested the port length would be too long and incorrect. also on the T port drawing that i made youll notice there is a center deflector, these are necessary, to help the air flow properly instead of having it clash against the back of the wall, which will cause turbulence and make the port perceptively longer. port correction is subtracted from the port before you draw it, its done while you calculate the port length. so if the port is drawn or built up as 18.75 and is 3" wide to figure the tuning you would subtract 1.5" to the 18.75" of port length. if you are calculating port length and your port calculations equal L:18.75" x W:3" , to account for end correction, you'll add 1.5" of port length. [/QUOTE]
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