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[Kevin Pippen]

Hello,

Please excuse me if this question has already been asked... I am curious to know what builders have used for the corner half-circular piece between the first and second horn segments inside the Labsub?... I was wondering if it's pre-kerfed MDF, luan (bendy board) or something similar?... I would also like to know the recommended thickness for this piece?... Any ideas or suggestions are greatly appreciated...  

http://web1.prosoundweb.com/lsp/LAB_18mm_drawing_1.pdf

I thank you in advance for your comments and/or suggestions...

Kev

EDIT: Edited for clairity...

[Al Limberg]

Hi Kevin,
After I post this someone will undoubtedly chip in with the proper name for the product that evidently resided in some of the dead brain cells here. It is a tubular concrete mold readily available from a concrete products supplier.  It is basically a heavy, perhaps 3/16"-1/4" thick cardboard sort of material.  A 21 1/2" long piece, cut in thirds length-wise, is sufficient for 3 Labs.

Al

[Ivan Beaver]

Sonotube

[Kevin Pippen]

Hello Al and Ivan,

After I posted this question the wife and I went to Lowe's to pick-up some things,...and while we were there I looked at these and wondered if they would work...  They have a couple different diameters and thicknesses...

What's the best way to fasten this stuff?...

Many thanks!

Kev

[Ivan Beaver]

Construction adhesive on the backside and staples (1/2") to anchor to the wood.

[Kevin Pippen]

Hi Ivan,

Would you recommend notching the birch so it would pop in place?...

Kev

EDIT: I can remember and old Adiare Audio subwoofer plan that called for sonotube...

[Al Limberg]

Thanx Ivan!

?;o)
Al

[Nimrod Webber]

Also gently peal off the outer plastic skin of the Sonotube to allow proper grip of the glue.

This is how I did mine.

[Kevin Pippen]

Kevin Pippen wrote on Sun, 20 January 2008 17:20

Would you recommend notching the birch so it would pop in place?...

Hello Nimrod,

Excellent! That's exactly what I was wondering...  Thank you for posting the picture!

Kev

[Tim McCulloch]

Click on Nimrod's link to his PSW profile, and click on "show all posts."

He's taken on a couple of interesting projects and documents them with well written text, drawings, and photos.  Plus he's nice guy, too!

Have fun, good luck.

Tim Mc

[Kevin Pippen]

Because the first to second horn segment (first turn) of my project is fairly close to the compression chamber (2.7:1 compression) I wanted to explore all of the possibilities... I found this company that specializes in cylinder, molded, bendy, and aircraft plywood... http://bd-international.com

Any thoughts?...

Kev

[Nimrod Webber]

Kevin Pippen wrote on Sun, 27 January 2008 15:39

Because the first to second horn segment (first turn) of my project is fairly close to the compression chamber...

Isn't 'your project' a standard Labhorn?  

Even if not, for similar application the Sonotube section is a perfect solution.
It is widely obtainable, already has the exact radius (for the Labhorn, at least), cheap, very strong, easy to fit/fabricate, bonds with your favorite wood glue ...

What more could you ask for...

 

[Kevin Pippen]

Nimrod Webber wrote on Mon, 28 January 2008 04:11

Isn't 'your project' a standard Labhorn?

Hello Nimrod,

Nope,...It's for a design I have been working on for quite some time... I'm in the final design stage and I'm moving forward with the construction of eight cabs... I decided to post my construction questions here as well as speakerplans.com because most of the principles still apply... I like preparing for how things are going together before I arrive at that turning-point (pun intended)...

Thank you for your advice, comments, and suggestions...    

Kev