port length

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kamberkash

Copper - Posts: 89

Joined: March 11, 2007

Location: Kentucky, United States

Posted: July 22, 2007 at 3:22 PM / IP Logged

Enclosure volume = 2.5 cu. ft.

40 square inches of port area. how long would i make the port to tune the box to 32 hz?

thanks in advance.

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kamberkash

Copper - Posts: 89

Joined: March 11, 2007

Location: Kentucky, United States

Posted: July 22, 2007 at 3:30 PM / IP Logged

or could anyone give me the formula to figure this out??? (sry about the dbl post.)

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: July 22, 2007 at 4:06 PM / IP Logged

40 sq-inches is equivalent to a 7.14" round port. (40 divided by pi = 12.75. Square root of 12.75 = 3.57" which would be the radius. 3.57 X 2 = 7.14" diameter) Using the port length calculator on this site ( LINK to the left) = port length 36.927" That's a lot of port length in a small enclosure. I recommend making your port opening half that size, then your length will be just under eight-inches.

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kamberkash

Copper - Posts: 89

Joined: March 11, 2007

Location: Kentucky, United States

Posted: July 22, 2007 at 5:51 PM / IP Logged

the manufacturer suggest 12-16 sq. in. of port area per cu. ft of volume. what would be the drawbacks of using a 19.625 sq. in. port that is 17 in. long? would there be any audible difference, meaning port noise. i could just run the port along the outside walls of the enclosure to get it to fit because i want to avoid port noise if at all possible. also i have another question. when taking the port into consideration for enclosure volume, i would really need a box that is 2.5 cu. ft plus the volume of the port, correct?

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DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: July 22, 2007 at 6:06 PM / IP Logged

kamberkash wrote:

the manufacturer suggest 12-16 sq. in. of port area per cu. ft of volume. what would be the drawbacks of using a 19.625 sq. in. port that is 17 in. long? would there be any audible difference, meaning port noise. i could just run the port along the outside walls of the enclosure to get it to fit because i want to avoid port noise if at all possible.

That would work fine. I doubt you will have significant port noise.

kamberkash wrote:

also i have another question. when taking the port into consideration for enclosure volume, i would really need a box that is 2.5 cu. ft plus the volume of the port, correct?

Correct.

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port length

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