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<blockquote data-quote="Phreaker" data-source="post: 2175141" data-attributes="member: 567899">I was trying to help and design someone a box for four 10&quot; AA Assassins and decided on 84sqin of port area and we were going to use 20.25&quot; of port length for a 32Hz tuning....I got thatlength by looking at the port length of a 5ft^3 box but didn&#039;t even remember that box tununing will rise everytime you up the port area.What would be the proper port length for a 5ft^3 box tuned to 32Hz with a 4&quot; x 21&quot; port (84sqin of port area)..?I used this port calculator <a href="http://www.carstereo.com/help/Articles.cfm?id=31" target="_blank">http://www.carstereo.com/help/Articles.cfm?id=31</a>and I plugged in 4&quot; to the port height and 21&quot; into the port width and it gave me 18.78&quot; for port length,then I plugged 21&quot; into height and 4&quot; into width and it gave me 27.28&quot; of port length....which would be correct?Here is the box plan...<a href="http://img158.imageshack.us/my.php?image=52ft332hzwith84sqinofportarealg0.jpg" target="_blank"><img src="http://img158.imageshack.us/img158/1184/52ft332hzwith84sqinofportarealg0.th.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></blockquote>

[QUOTE="Phreaker, post: 2175141, member: 567899"] I was trying to help and design someone a box for four 10" AA Assassins and decided on 84sqin of port area and we were going to use 20.25" of port length for a 32Hz tuning....I got thatlength by looking at the port length of a 5ft^3 box but didn't even remember that box tununing will rise everytime you up the port area. What would be the proper port length for a 5ft^3 box tuned to 32Hz with a 4" x 21" port (84sqin of port area)..? I used this port calculator [URL="http://www.carstereo.com/help/Articles.cfm?id=31"]http://www.carstereo.com/help/Articles.cfm?id=31[/URL] and I plugged in 4" to the port height and 21" into the port width and it gave me 18.78" for port length,then I plugged 21" into height and 4" into width and it gave me 27.28" of port length....which would be correct? Here is the box plan... [URL="http://img158.imageshack.us/my.php?image=52ft332hzwith84sqinofportarealg0.jpg"][IMG]http://img158.imageshack.us/img158/1184/52ft332hzwith84sqinofportarealg0.th.jpg[/IMG][/URL] [/QUOTE]

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