Bandpass with Pr not Ports?

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=52005
Printed Date: May 18, 2025 at 4:25 AM

Topic: Bandpass with Pr not Ports?

Posted By: Poormanq45
Subject: Bandpass with Pr not Ports?
Date Posted: March 16, 2005 at 1:12 PM

I've been reading about bandpass enclosures, and it seems that their one major flaw is that they have a very audible port mode. Anyway, I was thinking, could a Passive radiator be used instead of ports in the bandpass enclosure? I mean, this would get rid of any unwanted port noise, AND if the PR was properly sized with enough Xmax, there wouldn't be any problem with suspension noise.

How does this sound? Is it phesible?

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Replies:

Posted By: stevdart
Date Posted: March 16, 2005 at 1:24 PM

Try it and let us know how it works out.

Posted By: Poormanq45
Date Posted: March 16, 2005 at 1:30 PM

Thank you for the response posted_image

.

I was just wondering. Sinse on home stereo speakers a Passive radiator is sometimes used in place of a port. I was wondering if the same thing could be done with a bandpass enclosure?

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Posted By: stevdart
Date Posted: March 16, 2005 at 1:39 PM

The PR is not used in place of a port...it's an entirely different setup with an entirely different frequency response. You'll notice those PR speaker systems come in some pretty big enclosures compared to vented systems. You have any speaker design software that you can play around with so you can model out these ideas you have?

Posted By: Poormanq45
Date Posted: March 16, 2005 at 1:56 PM

Hmm, I have WinISD, but I haven't played with that in awhile.

Hmm, I understand that PRs are different the Ports in a few ways, but arn't PR systems still classified as vented enclosures?

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Posted By: kfr01
Date Posted: March 16, 2005 at 2:03 PM

See https://www.diysubwoofers.org/prd/

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