on isobaric dual reflex banpass

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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=112141
Printed Date: July 01, 2025 at 5:22 PM

Topic: on isobaric dual reflex banpass

Posted By: boost infection
Subject: on isobaric dual reflex banpass
Date Posted: March 05, 2009 at 8:50 PM

Newbie question

I wanted to build a Isobaric dual reflex bandpass setup for my bmw 5 series. I know when loading in an isobaric setup the box is cut in half( 1 woofer in 2 cubes now becomes , 2 woofers in 1 cube). My problem is the the port stay the same in both camber?

Example: woofer is in a vented 2.5 cube box and , 2 4inch ports x 8.75 long.

Thanks

Replies:

Posted By: paidnfull
Date Posted: March 06, 2009 at 2:24 PM

I would have to say there is a whole lot more math to it than just cut the box in half. I also believe that you use the airspace for one full sub. You just don't need the airspace for the extra sub.

This type of enclosure is probably not recommended by many. Most people don't like the dual reflex enclosure or isobaric. You are trying to combine them which I can't possibly see working out the way you want it to. Unless you know someone who is extremely knowledgeable about building these type of enclosures, I would stay away from it.

Only benefit to the isobaric enclosure is you can double the power to the enclosure, but you gain no cone area.

Dual-reflex enclosures or bandpass, you sacrifice so much of the frequency range of the enclosure it will likely be loud, but somewhat of a one note wonder.

See what other people say, but thats my opinion. Hope it helps

Posted By: boost infection
Date Posted: March 06, 2009 at 4:26 PM

Thanks for the reply. I wanted to try something different in my car. I am trying to do more research on this.