how to figure square port length

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beyma guy

Member - Posts: 16

Joined: July 18, 2004

Location: United States

Posted: May 20, 2005 at 12:23 PM / IP Logged

need to figure out how to figure square port length i want the box to be tuned to 35 hz and its 3 cubic feet

my system

4 beyma ast05 tweeters

4 beyma w6 mid drivers

2 beyma nd 105 mid drivers

2 clif design competion 12subs

2 cd1.1lx amps

2 cd4.4lx amps

1 cd5.2lx amp

hu is a pioneer dehp8500 mp

j_darling2007

Copper - Posts: 210

Joined: January 21, 2005

Location: United States

Posted: May 20, 2005 at 12:38 PM / IP Logged

We need to know 1)how big you want the square, OR 2) How long you want the port. Then we can tell you the other dimension to make the port.

There are 3 kinds of people in the world, those who can count and those who can't

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: May 20, 2005 at 12:51 PM / IP Logged

Square (or rectangular) ports are the same length as round ones of the same opening area. You simply need to calculate the equivalent area of your square as if it was round; meaning, for example, a 4" round port is approximately 12.6 square inches in area. An equivalent rectangular port would be 6.3" X 2". The length of the two would be the same (for 33Hz in 3 cuft, approx. 7.5" long.)

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soundmasta

Silver - Posts: 246

Joined: November 17, 2004

Location: United States

Posted: May 25, 2005 at 8:18 AM / IP Logged

got on audiobahns websit and cheat. they have a great port calc. in their tech section.

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how to figure square port length

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