18 ported box
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=102248
Printed Date: October 29, 2025 at 11:12 PM
Topic: 18 ported box
Posted By: audiohookup
Subject: 18 ported box
Date Posted: February 16, 2008 at 11:59 AM
I would like to apologize for having to ask about this topic. I personally wouldn't use a sub that doesn't have info on optimal box size and what not. The sub I'm building a vented box for is a Pyle PL1890BL. I've entered in the specks from Pyle's web site to Winisd. It says I need a 299 ft^3 Box. What is wrong with that picture? I changed the box size to 29"x19"x14" MDF of .75" thick = internal volume of 3.48126. I have no idea about woofer displacement. Tuning the box to 45hz using a 4" port Winisd says I need a port length of 1.82" (doesn't seem long enough)gives me an 8+DB gain from 45hz to about 60hz. Can anyone help I'm looking for port length for a 4" port and does that length include .75" wood thickness? And woofer displacement I'm sure that will be needed to get the port length right.I'm also using a .5" shelf brace with holes in it.
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Christian
Replies:
Posted By: audiohookup
Date Posted: February 16, 2008 at 4:27 PM
Well I went with a 10.25" long port. I don't know if this is the optimal length but it hits pretty hard. Just finished sealing up the top baffle. So I wont get to hear it in the car till tomorrow. I still would like to know why winisd was telling me to build a 299 cubic foot box.
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Christian
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