Question about building bandpass box

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=28873
Printed Date: May 09, 2025 at 8:56 PM

Topic: Question about building bandpass box

Posted By: Disaster092
Subject: Question about building bandpass box
Date Posted: March 22, 2004 at 9:06 PM

I have a simple question, well i hope its a simple question. I am making a dual 8" bandpass box for a project in my Co-op educational program. I have the speaker enclosures down no problem, my dilemma here is, does it make a huge difference what size the sealed front box part, the part that you can see into, the sealed part. Sorry for the redundancy, just trying to make it clear what i am talking about.

If it helps, enclosures for the subs is 0.42 cu. ft. each. And they are only little 100w DVC 4-Ohm subs.

Any help would be appreciated. Thanks alot.

Replies:

Posted By: jbjohn22jb
Date Posted: March 22, 2004 at 9:57 PM

Are you talking about the size of the port holes themselves?

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"I'm only doin' this for ya because I heard that Buffalo Bob guy shoved a road flare up yer bunghole...."
Kenwwod 315s
2 Audiobahn AWI25IT
1 Audiobahn A275HCT
1 Tsunami 1.0
1 Legacy 3.0

Posted By: thapimpfromchi
Date Posted: March 23, 2004 at 4:14 AM

No, he is talking about the Front half. Most bandpass boxes come with a plexiglass front enclosure so you can see the woofers. that is the half he is referring to. I dont have an answer for you bud, but i figured i'd clear that up for you.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Posted By: DYohn
Date Posted: March 23, 2004 at 8:30 AM

Ah, yes. You are talking about building a 4th order bandpass enclosure (one ported chamber.) The volume of the sealed portion will change the tuning of the enclosure just as much or more than the size of the port will. You must calculate the proper size for the sealed chamber based on your driver(s). Check this page (and do a search on the web for more info.)

https://www.jlaudio.com/tutorials/magic/bandpass.html