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  #1  
Old 05-23-2009, 02:02 PM
 
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Post can anyone understand this?

Quote:
Originally Posted by madmat View Post
Sealed chamber is .653 CU Ft. Mag rests in the sealed chamber. Front chamber is .493 CU Ft. The port attaches to the front chamber, The port is a slot port. The box proper is 12.5 X 12.5 X 19.14" EXCLUDING THE PORT. Those are external dimensions. The port will tack on at the side of the box and extend the width by 19.614". The port will be a labyrinth in the neighborhood of 70" long. The baffle for the sub will be 10.18" (side wall to inside of baffle) from the end of the sealed part of the box. The side wall of the 2nd enclosure is 6.71" from the face of the baffle and is the beginning of the port. All material is .75". I'm including a freehand sketch of the box from the top so you'll understand the port.



Don't hate on my sketch, it took all of a minute to draw up.

By the way, the internal width and height of the box are 11" X 11".
Quote:
Originally Posted by madmat View Post
Sorry, the port is 11" X 2.519". The port walls will extend into the box 8.481" and be 2.519" apart. I thought I'd put the port dimensions in my post.
Quote:
I don't have a cut sheet. The dimensions are all on that post aside from the port which is down a bit on the last post I made.

The internal dimensions are in here:

Image: http://img.photobucket.com/albums/v4...t_2001/Box.jpg

aside from the port. For the port you'll have to extend the box width by 19.614". The opening to the port will be a 2.51" slot cut into the small chamber's end wall.

Lay out the box on a sheet of MDF from the top view I drew. After laying out the box based on the above screen cap simply go out another 19.614" and ad a wall that's 9.41" alternating with the gap on the end opposite from the last gap... as I've drawn. The walls will be 2.51" apart. and the side of the box will have a 2.51" opening at the end facing forward.

Image: http://img.photobucket.com/albums/v4..._2001/Box2.jpg

Those are the external dimensions of the box sans port.

I hope you can make sense of it and how I'm adding the port on.
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  #2  
Old 05-23-2009, 02:07 PM
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Yup it's a 4th order bandpass crossed with a transmissionline.
{{{ Just Kidding }}}

It's a fourth order bandpass with a really long port.

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Old 05-23-2009, 02:16 PM
 
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i understand that, but im trying to understand how to build it and their is no cutsheet and no real picture so im not really sure how the hell to build it...
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Old 05-23-2009, 02:25 PM
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I wasted a bit of time making an explanation of it..
Cut sheet?
who needs a cut sheet?
Just start building sumthin
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Old 05-23-2009, 02:30 PM
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Wow, can probably get away with using 1/8th of that port length.
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Old 05-23-2009, 02:32 PM
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The JBL PDF has a great 4th order design. It would be alot easier to build.

Last edited by iamsonic; 05-23-2009 at 03:08 PM.
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Old 05-23-2009, 02:33 PM
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Actually the sketch is consistant with the written description.

Last edited by iamsonic; 05-23-2009 at 03:04 PM.
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Old 05-23-2009, 02:53 PM
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http://manuals.harman.com/JBL/CAR/Bo...0Enclosure.pdf

The JBL PDF has a great 4th order design. it is equal to mad mats deign in the output and clarity you will receive.

Last edited by iamsonic; 05-23-2009 at 03:02 PM.
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Old 05-23-2009, 02:57 PM
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Quote:
Originally Posted by HHR_Ed View Post
Wow, can probably get away with using 1/8th of that port length.
Not for the tuning you can't.
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Old 05-23-2009, 02:57 PM
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Quote:
Originally Posted by iamsonic View Post
I actually think the sketch is not consistant with the written description.
Yes it is.
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