ported boxes

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=25807
Printed Date: July 19, 2025 at 4:03 AM

Topic: ported boxes

Posted By: sbrock
Subject: ported boxes
Date Posted: February 03, 2004 at 10:01 PM

In the port length calculator section it says to find the length of the port L= 14630000*(D/2)*(D/2)/fb*fb*vb*1728-1.463(D/2) I feel this is a real good formula its the one I have always used to figure of port dimension but my problem is when I type in the numbers in the blanks to find out the length I dont think it subtacts the 1.463(d/2) and I was wondering if anyoune else has discovered that and if so am I right or am I not doing my math correctly maybe someone can help me

Replies:

Posted By: kingfridae
Date Posted: February 03, 2004 at 10:41 PM

SBROCK I have wondering the same thing. The calculator on this site is nice but It seems to not do the subtraction shown in the formula... Does anyone know how to help us with this? Im hoping the 12volt moderators or someone with knowledge about this calculator can help us. It does make a difference on what frequency your box is tuned at. HELP!

Posted By: kingfridae
Date Posted: February 03, 2004 at 10:42 PM

SBROCK I have been wondering the same thing. The calculator on this site is nice but It seems to not do the subtraction shown in the formula... Does anyone know how to help us with this? Im hoping the 12volt moderators or someone with knowledge about this calculator can help us. It does make a difference on what frequency your box is tuned at. HELP!

Posted By: geepherder
Date Posted: February 04, 2004 at 12:07 AM

I just posted a question to the moderators in the Forum Help & How To's. I haven't used the port length calculator, just was reading through the new posts. We'll see what happens.

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My ex once told me I have a perfect face for radio.

Posted By: TDean
Date Posted: February 04, 2004 at 12:15 AM

https://www.carstereo.com/help/articles.cfm Check here. This may not be any better. Never used it.

Posted By: sbrock
Date Posted: February 04, 2004 at 8:39 AM

Is there not anyone esle out there who has expierenced the same problem or am I adding wrong when I work out the formula on paper because I keep coming up with the same thing and it dont match the calculator unless I leave off the -(1.463*(D/2)) I would really like to find out can someone please help me with this

Posted By: geepherder
Date Posted: February 04, 2004 at 10:42 AM

Read this post:

https://www.the12volt.com/installbay/forum_posts.asp?tid=25814&PN=1&tpn=1

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My ex once told me I have a perfect face for radio.