l7 15 ported enclosure

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=101289
Printed Date: May 13, 2025 at 1:51 PM

Topic: l7 15 ported enclosure

Posted By: bman365
Subject: l7 15 ported enclosure
Date Posted: January 17, 2008 at 6:06 PM

I haven't stretched the fabric yet, so I don't know how much air space I will have but I'm shooting for around 4-4.5 ft^3 for one L7. So with a 4 ft^3 box, how big should the port be to tune it to 33hz. I want the width of the port opening to be 14.75 in.

Replies:

Posted By: bman365
Date Posted: January 17, 2008 at 6:09 PM

Forgot to add that I want it to be a rectangle type port.

Posted By: jmelton86
Date Posted: January 17, 2008 at 6:16 PM

https://www.the12volt.com/caraudio/boxcalcs.asp#por

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: bman365
Date Posted: January 17, 2008 at 7:19 PM

thats for round ports only..

Posted By: bman365
Date Posted: January 18, 2008 at 1:26 PM

What causes port noise? Too thin of a opening? I want my opening around 3.5"x14.75"..I wont get port noise with that will i

Posted By: jmelton86
Date Posted: January 21, 2008 at 6:59 PM

From what I understand, too small of ports have bad noise. This is why you see huge ports often. Maybe someone can reiterate.

Do a search on the subject an you'll find calculators for round/square port conversion.

-------------
2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: ice32
Date Posted: January 21, 2008 at 9:14 PM

Circle port length to slot port calc

use that in combination with the link that jmelton gave you and you should get the tuning freq u want for a square/rectangle port

I'm not sure but from what I've read apparently port noise is from lack of port area

P.s
This might be a bit more of what you want.

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