building portted 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=126075
Printed Date: May 14, 2024 at 3:12 AM

Topic: building portted box

Posted By: jpadj22
Subject: building portted box
Date Posted: February 08, 2011 at 3:32 PM

Ok I recently bought 2 pioneer premier from my freind. The speakers look in good condition but unfortunately the box isin't.So i got to lookin around for boxes and id rather TRY and build one.Now I been doing research on this site on how to build one but im very confused.I want to know if anyone can tell me what do i need to take into consideration to get the dimesions for my box.

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No better feeling then getting a remote start to work right!

Replies:

Posted By: DYohn
Date Posted: February 08, 2011 at 6:23 PM

The first thing you need is the exact model numbers for the speakers you want to use.

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Posted By: jpadj22
Date Posted: February 08, 2011 at 7:25 PM

There the ts-W303R. Recomended enclosure .85-1.75 cubic feet.

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No better feeling then getting a remote start to work right!

Posted By: DYohn
Date Posted: February 09, 2011 at 10:02 AM

Yes... based on the specs available on the web that woofer is going to sound really boomy unless it's in a very large enclosure. In the recommended 1.75 cuft per woofer system vented at 19Hz you will get some decent SPL but not very good sounding music. You'll also push it past peak cone excursion unless you keep the power down below 75 watts per woofer.

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Posted By: jpadj22
Date Posted: February 09, 2011 at 11:07 AM

Thank for your reply Dyohn. So ill do the 1.75 cubic ft per woofer.Now i dont understand what you mean by venting the system at 19hz .I have to keep the power below 75 watts? Wow i thought i had gotten some decent woofers posted_image

. Although i dont want to have a system thats too crazy. Im a BIG DIY guy so i want to give this project a try. Im pretty handy with my hands I did alot of research on the tools i need im missing a couple but im going to buy them as soon as i feel i have enough to get this project rolling. With a little help im pretty sure i can do it thanks.

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No better feeling then getting a remote start to work right!

Posted By: DYohn
Date Posted: February 09, 2011 at 12:17 PM

Venting = porting. You need to design your port size for a 19Hz tuning frequency. See the port size calculators on this site.

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Posted By: jpadj22
Date Posted: February 09, 2011 at 1:00 PM

Thanks again. Ok so here is what i have ....

port width 1.5"

port height 2"

box volume being 1.75

tuning frequency 19hertz

My port legnth should be 11.3

So my divider in the the box should be 11.3 " long?

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No better feeling then getting a remote start to work right!

Posted By: DYohn
Date Posted: February 11, 2011 at 10:33 AM

If you ask me that port will be much too small. If you want to build a dual-chamber enclosre yes, generally it is easiest to use a slot port with a solid wall between the two chambers, but the wall cannot be the port length. The port needs to ne open to the chambers. Here's an example of what the inside of such an enclose typically looks like:

posted_image

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Posted By: jpadj22
Date Posted: February 11, 2011 at 1:45 PM

Wow!! thanks for the picture! I was thinking of doing the dual chamber enclosre like the picture above( at least i hope). Ok, so I think im ready to go thanks for all your help Dyohn. Im going to buy the materials this weekend weekend. Thanks

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No better feeling then getting a remote start to work right!

Posted By: 3ball1971
Date Posted: March 02, 2011 at 3:38 PM

Will that box design work with just one speaker?

Posted By: stevdart
Date Posted: March 02, 2011 at 9:53 PM

If you were to split the picture down the center, yes it would work. That picture shows that each woofer has its own separate vent. That means that each woofer is tuned separately from the other.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.