Ported Box help

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=28089
Printed Date: November 26, 2025 at 8:17 AM

Topic: Ported Box help

Posted By: gregfocker77521
Subject: Ported Box help
Date Posted: March 09, 2004 at 9:58 PM

what would be the sloted port size for a box that requires a 4" X 12" rounded port.

How would I calculate this?

Replies:

Posted By: JakeJ
Date Posted: March 09, 2004 at 11:00 PM

   Your port radius x radius x 3.14 x lenght
        2"x2"x3.14"x12" = 150.72cubic"
    Sloted port
        2" tall x6.28" wide x12" long =150.72cubic"

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Wyoming 12volt Enthusiast

Posted By: gregfocker77521
Date Posted: March 09, 2004 at 11:15 PM

then how come the boxes I always see have bigger sloted ports????

Posted By: thapimpfromchi
Date Posted: March 09, 2004 at 11:20 PM

cuz they might be bigger but not as deep. different shape of the box means different shape of the port. as long as the volume is the same, it shouldnt really matter.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Posted By: JakeJ
Date Posted: March 09, 2004 at 11:24 PM

I know this port will work in replacement of your round port. What I am not sure of is if you can decrease the length and add to the height or width. I assume you can as long as the displacement is the same (150.72 cubic")

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Wyoming 12volt Enthusiast

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