port diameter & length

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=75494
Printed Date: May 16, 2025 at 2:02 AM

Topic: port diameter & length

Posted By: 05colorado
Subject: port diameter & length
Date Posted: April 01, 2006 at 6:11 AM

BOX dimensions: 50"w x 17"h x 15"d

2 x 4"port 7"long <=======================?

2 x rockford fosgate HX2 15" subs

rockford fosgates webpage reccomends that port size and length, should the length be longer, I am trying to achieve low and loud bass

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Replies:

Posted By: DYohn
Date Posted: April 01, 2006 at 9:54 AM

This is what Rockford recomends for two of these woofers in one enclosure? Hmm. Well the enclosure seems large enough (5.8 cuft gross) but the port seems off as it is tuning to about 18Hz. What is the fs, Vas and Qts of one of those woofers?

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Posted By: boardinbum
Date Posted: April 01, 2006 at 6:20 PM

Actually, I think I graphed this woofer up once. And you did have to tune it down to about 18hz and there's a nice rounded slope that peaks at about 50hz.

Posted By: 05colorado
Date Posted: April 01, 2006 at 9:46 PM

boardinbum wrote:

Actually, I think I graphed this woofer up once. And you did have to tune it down to about 18hz and there's a nice rounded slope that peaks at about 50hz.

so how do i get that

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chrome...its whats for dinner

Posted By: boardinbum
Date Posted: April 02, 2006 at 12:43 AM

First off, I want to make sure this is right. Which sub is it you have? The RFD2115 or the RFD2215?

Posted By: boardinbum
Date Posted: April 02, 2006 at 12:45 AM

Actually, DYohn, he had it tuned at ~35hz.

Posted By: 05colorado
Date Posted: April 02, 2006 at 1:56 AM

I have the RFD1215 's

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chrome...its whats for dinner

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