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Old 13th May 2013, 02:08 PM   #231
kees52 is offline kees52  Netherlands
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Yes it makes a smooth response, like in the lab12 is done.
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Old 18th May 2013, 01:50 PM   #232
kees52 is offline kees52  Netherlands
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Hi All The Tapped horn is ready, box is folded and very precise also.

nice graph.

good luck with building.

kees
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Old 19th May 2013, 01:23 AM   #233
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jbell's set of four tapped horns

Post #155:

"As to corner reflectors: it seems that they should be used sparingly, and mainly for structural reasons; screamerusa's experiments provide interesting food for thought, and it will take experimenting to optimize the placement and size of corner reflectors. The only thing that is certain about reflectors is that they reduce the internal volume, and that is generally not a good thing."
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Old 19th May 2013, 11:12 AM   #234
kees52 is offline kees52  Netherlands
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I have measure the corner volume, the reflectors smallest part is some bigger then needed so it wil not reduce the volume. the same with folding i did step by step measure the height
in the foldings a la hornresp output, and so the panel has automatic correct placement. I did start with the volvotreters folding scheme and then work out the proper length.

But I was forgotten the conus correction, it has to be done, I did not now.

regards
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Old 19th May 2013, 11:54 AM   #235
AndrewT is offline AndrewT  Scotland
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If you have an expansion from the 20.6 just before the corner to 21 just after the corner, then you should continue that expansion smoothly (in comparison to the wavelengths) through the corner.
We have seen from earlier experiment that a throttle has a disproportionate effect if implemented in the wave route. Similarly a short and small expansion that returns to the normal area has a lesser effect, much less it seems.

Using that evidence, then the minimum width in the route around the corner must be >=20.8, at half way around.
Smaller will appear as a throttle, whereas bigger should have a minimal effect.

But at the wavelengths we are handling, does the addition of the corner corrector give a measurable, or audible improvement? Or does it just look "right"?

I recall one of our experts stating that a bass horn could have parallel sections (no expansion) that "stepped" up the area, in discrete stages from throat to mouth and it would perform just the same as a smoothly expanded horn shape. Can someone remember who and exactly what was stated?
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Old 19th May 2013, 12:13 PM   #236
nuconz is offline nuconz  United States
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Quote:
Originally Posted by kees52 View Post
Hi All The Tapped horn is ready, box is folded and very precise also.

nice graph.

good luck with building.

kees
it looks really nice. are the box dimensions the same as for the original on page 1? so are sides a, b, c, d, e, f the same length and width?
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Old 19th May 2013, 01:03 PM   #237
kees52 is offline kees52  Netherlands
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Hi

The dimensions are not the same, I did need to do different for better respons, in picture is
the dimensions given, or download the sketchup zip file.

I need to correct the tapped horn because I have not correct the conus volume, Now I don,t now
exactly how to do this, some make a panel, others do shifting S2 to the edge of the woofer making
S1 bigger etc, but if someone can explane how to do this best i like it to hear, the conus volume of
the woofer is 2.3712 liter 23712 cc.

regards

kees
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Last edited by kees52; 19th May 2013 at 01:06 PM.
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Old 19th May 2013, 06:35 PM   #238
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Default Lab 12 single fold

Does any one have a different fold on this TH. I already built one like on the first page of the thread, and would like another. I need it to be taller and not as wide. I want to stand it in the corner. Maybe a single fold. How would you join the plywood in such a long box?

I just searched this thread again and found what I am looking for on post #181. I want to know if one on page 1 and this one, on post #181 would work in the same room or would there be any issues? Thanks, Bill

Last edited by snailtrax; 19th May 2013 at 07:04 PM.
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Old 19th May 2013, 08:09 PM   #239
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Quote:
Originally Posted by snailtrax View Post
Does any one have a different fold on this TH. I already built one like on the first page of the thread, and would like another. I need it to be taller and not as wide. I want to stand it in the corner. Maybe a single fold. How would you join the plywood in such a long box?

I just searched this thread again and found what I am looking for on post #181. I want to know if one on page 1 and this one, on post #181 would work in the same room or would there be any issues? Thanks, Bill
Bill,

Path length is longer on the page one version, it goes lower and would require the top cabinets to be delayed longer than the shorter path length version on page 181.

That said, if they are not next to the tops, they are not aligned anyway.

The 181 post is only 96", requiring no joining.
I have simply done lap joints with a backing piece of wood screwed on when I needed to join plywood. The little space the added lap reduces is generally of no consequence in a large cabinet.

Art
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Old 20th May 2013, 11:00 AM   #240
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Quote:
Originally Posted by weltersys View Post
Bill,

Path length is longer on the page one version, it goes lower and would require the top cabinets to be delayed longer than the shorter path length version on page 181.

That said, if they are not next to the tops, they are not aligned anyway.

The 181 post is only 96", requiring no joining.
I have simply done lap joints with a backing piece of wood screwed on when I needed to join plywood. The little space the added lap reduces is generally of no consequence in a large cabinet.

Art
Has anyone folded one that would match?
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