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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: 2729031" data-attributes="member: 561215"><p><a href="http://www.putfile.com/pic.php?img=4929175" target="_blank"><img src="http://img1.putfile.com/thumb/3/6516444811.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>here is your image modified to help you understand it a bit better.</p><p></p><p>the values that i give you are assuming that the red line is 3", because you didnt provide any values for it. but you can go as small as 1.5" for the red line because the port is open on both ends which will still provide the proper port area for the port. any less and you will change the characteristics of the port.</p><p></p><p>so the math would be 15" + 1.5" + 1.5" + .75"=18.75"</p><p></p><p></p><p>for the end correction of my T port drawin. it would be 10.25+5.75+1, only if you taken into account the K factor before you made the drawing. you would calculate the port length and then add 1" to the physical length of the port to get the perceived length of the port.</p><p></p><p>now if you are designing the port then once you calculate the port length you would take the 1" "on a 2" wide port" from the length of the port, to properly account for the K factor "port end correction".</p><p></p><p>about your T port. my drawing is a true T port "no baffle separating each port". your drawing is not a T port, but two L shaped ports back to back, so you would calculate your T port length and width of the port at the end of the port, just like you would for a regular L shaped port. and 12+7+1.5 is incorrect. assuming that the port end is 3" from the nearest wall and 3" wide. it would be: 12" + 7" + 1.5" + 1.5" + .75 + 1.5"= 24.25" of perceived port length</p><p></p><p>when you draw your port you don't draw the port with port end correction, because port end correction is a perceived length. its not the physical length of the port. you draw the physical length of the port. the same way it would be built.</p><p></p><p></p><p>yes to figured the perceived length of the port you would add 21.25+18.75+2 (half of the width) that will get you the perceived length, so you can find the tuning of the port. when you draw your port or build the enclosure. your port should look just like on the drawing.</p><p></p><p>well i hope that helped clear it up for you.</p><p></p><p>if not then ask away.</p></blockquote><p></p>
[QUOTE="PowerNaudio, post: 2729031, member: 561215"] [URL="http://www.putfile.com/pic.php?img=4929175"][IMG]http://img1.putfile.com/thumb/3/6516444811.jpg[/IMG][/URL] here is your image modified to help you understand it a bit better. the values that i give you are assuming that the red line is 3", because you didnt provide any values for it. but you can go as small as 1.5" for the red line because the port is open on both ends which will still provide the proper port area for the port. any less and you will change the characteristics of the port. so the math would be 15" + 1.5" + 1.5" + .75"=18.75" for the end correction of my T port drawin. it would be 10.25+5.75+1, only if you taken into account the K factor before you made the drawing. you would calculate the port length and then add 1" to the physical length of the port to get the perceived length of the port. now if you are designing the port then once you calculate the port length you would take the 1" "on a 2" wide port" from the length of the port, to properly account for the K factor "port end correction". about your T port. my drawing is a true T port "no baffle separating each port". your drawing is not a T port, but two L shaped ports back to back, so you would calculate your T port length and width of the port at the end of the port, just like you would for a regular L shaped port. and 12+7+1.5 is incorrect. assuming that the port end is 3" from the nearest wall and 3" wide. it would be: 12" + 7" + 1.5" + 1.5" + .75 + 1.5"= 24.25" of perceived port length when you draw your port you don't draw the port with port end correction, because port end correction is a perceived length. its not the physical length of the port. you draw the physical length of the port. the same way it would be built. yes to figured the perceived length of the port you would add 21.25+18.75+2 (half of the width) that will get you the perceived length, so you can find the tuning of the port. when you draw your port or build the enclosure. your port should look just like on the drawing. well i hope that helped clear it up for you. if not then ask away. [/QUOTE]
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