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Old 3rd April 2010, 02:55 AM   #1
ljk11 is offline ljk11  Trinidad and Tobago
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Join Date: Feb 2005
Location: Port of Spain
Default TH folding


a bit late to the TH/Hornresp party.

Question, after starting with a driver and fiddling with Hornresp,

Is it that the Hornresp values basically fit as per this diagram
Click the image to open in full size.

And can be folded a per
Click the image to open in full size.

In this example the folding is basically done in the L23 segment.
Would simply drawing it out the first long diagram to scale on paper, then cutting and folding to suit so it fits in a box be the standard procedure ?

Also if this is a 3 segment TH, what would a 4 segment look like ?
And what about S5, when is it applicable ?



Last edited by ljk11; 3rd April 2010 at 02:57 AM.
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Old 3rd April 2010, 05:37 AM   #2
FlipC is offline FlipC  United States
diyAudio Member
Join Date: Aug 2008
Your correct.
That one be a simple single fold TH layout. As far as 3 vs 4 vs 5. Nothing set in stone.
You could have an S type layout or something like the TH Spud.

You start with the driver you build to suite.
You start with a size, you fill to suite. (ie find the best driver and layout for that size)
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Old 3rd April 2010, 06:53 AM   #3
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Be prepared to model with several drivers too. The tapped horn I'm currently working on (see other threads started by me for details) has undergone numerous renditions with some 6 or 7 drivers. I ended up coming back to one of the first drivers I had set aside, as my knowledge of horn theory and number of modeling hours grew.
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Old 3rd April 2010, 07:30 AM   #4
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Join Date: Jul 2008
Location: Pacific Northwest
Hey - I've seen those drawings someplace...

Rather than use paper, I fold in Google's Sketchup software. It is a little intimidating at first, but once you get the hang of it, there really is no other way to do it.

Simple folds can be done on paper, but as soon as you fold things more than once, you'll have to "fix" the problems created in a simple geometric fold.

Here's what you can do with Sketchup:

Click the image to open in full size.

I'll admit I had help making it look nice, but the folding and design is mine, and all of this was done in sketchup.
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Old 3rd April 2010, 11:50 AM   #5
ljk11 is offline ljk11  Trinidad and Tobago
diyAudio Member
Join Date: Feb 2005
Location: Port of Spain
yeah, I ripped the images from your tutorial elsewhere
thanks for the replies

let me confirm, so in this 6 or 7 fold box you have above,
if I were to lay out the sections in a straight line they would all correspond to L23 ?

Also I have seen some designs where the driver cutout hole is smaller than the driver
what is the reason for this ?
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Old 3rd April 2010, 06:32 PM   #6
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Join Date: Nov 2007
Originally Posted by littlemike View Post
Here's what you can do with Sketchup:
Considering the frequency range involved and the number of folds in that horn, all those slight angles may not be necessary. You can basically "digitize" the horn by creating it out of segments of increasing cross-sectional area - any response anomalies will appear way above the passband.
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