slot port dimensions

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=115502
Printed Date: May 21, 2024 at 9:36 AM

Topic: slot port dimensions

Posted By: dodoandduck
Subject: slot port dimensions
Date Posted: August 06, 2009 at 3:37 PM

I was wanting to know how to calculate Slot port dimensions. I have three Audiobahn AW1000v's which call for a 3" diameter port 8" in length. I'm building a shared airspace fiberglass box with 4.5 cu total airspace and want to configure a rear firing slot port. Thanks for the help.

Replies:

Posted By: i am an idiot
Date Posted: August 06, 2009 at 8:19 PM

A 3 inch circle has 7 Sq Inches of surface area. A 2 X 3.5 inch port the same length will be the same as the 3 inch round port.

Formula to figure the surface area of a circle is Pi (3.14159) X Radius Squared. 3.14159 X (1.5 X 1.5) = 7.068

Surface area of a slot = Height X Width. 2 X 3.5 = 7

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Posted By: dodoandduck
Date Posted: August 08, 2009 at 6:54 AM

Very cool. Thank you. So a slot port 2" high 10.5" wide and 8" deep would be the same as ( 3 ) 3" by 8" round ports. Appreciate the help.

Posted By: DYohn
Date Posted: August 08, 2009 at 11:40 AM

dodoandduck wrote:

Very cool. Thank you. So a slot port 2" high 10.5" wide and 8" deep would be the same as ( 3 ) 3" by 8" round ports. Appreciate the help.

This is incorrect. 3X 3" X 8" ports will tune to a higher frequency than 1X 2"X10.5"X8" slot.

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Posted By: dodoandduck
Date Posted: August 13, 2009 at 6:59 AM

Ok, so what would be the correct calculation then. Thanks for the help. I'm looking to tune to 35.424 in a 3.750 cu/ft enclosure.

Posted By: DYohn
Date Posted: August 13, 2009 at 8:30 AM

Use the calculator on this site. And realize your actual tuning will never be so precise as 35.424 Hz, although you can cewrtainly enter that into the calculator. 35 would be your target.

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