TH folding

[ljk11]

Hello,

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


And can be folded a per


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 ?

Thanks,

Lennard

[FlipC]

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)

[letsbangout]

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.

[littlemike]

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:



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.

[ljk11]

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 ?

[Brian Steele]

Originally Posted by littlemike

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.