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Old 18th May 2011, 05:36 AM   #1881
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Quote:
Originally Posted by revintage View Post
Do you have any ideas on how to use data from Hornresp to design radialhorns?
Hi Lars,

When exporting the horn data, simply set the Width Flare to 'Con'.

Kind regards,

David
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Old 18th May 2011, 05:50 AM   #1882
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Hi kahvis,

Quote:
Originally Posted by kahvis View Post
Is that true the 1. tapped horn have a better impulse response than 2.?
If that's what your Hornresp simulations are indicating, then I expect it may well be the case.

Quote:
Originally Posted by kahvis View Post
I have noticed that the shorter S1 - S2, give the better impulse response, but is that important difference in subwoofer frequences like 100hz and below?
I wouldn't have thought so, but I am not an expert on such matters :-).

Kind regards,

David
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Old 18th May 2011, 06:29 AM   #1883
kahvis is offline kahvis  Finland
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Quote:
Originally Posted by David McBean View Post
Hi kahvis,
If that's what your Hornresp simulations are indicating, then I expect it may well be the case.
It seems in the hornresp schematic view that tapped horn simulating is more optimized for a offset drivers. In the picture the 1. tapped horn have a driver in the throat of tapped horn. Then S1 - S2 is almost zero?

Thanks for helping
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Old 18th May 2011, 07:32 AM   #1884
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Quote:
Originally Posted by kahvis View Post
In the picture the 1. tapped horn have a driver in the throat of tapped horn. Then S1 - S2 is almost zero?
Hi kahvis,

Correct.

To simulate the 1. tapped horn configuration, set L12 = 0,01 cm.

Kind regards,

David
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Old 18th May 2011, 10:48 AM   #1885
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Quote:
When exporting the horn data, simply set the Width Flare to 'Con'.
Hi David,
This should be to much of a approximation. This as length will be another due to the area will be larger for the same length at 0 degrees as the mouth is curved. The sides of the Con will be too long.

If we use a flare like tractrix where design is made from the mouth and backwards to the point where it is square, a radial will work. After that adding a square to round section to the driver. This should be done to give a smooth transition to the radial section. Otherwise a JBL 2328 could be added. I don´t thin it will be good idea to place the driver directly to the radial section.

Altec 511 is a rough example of an old exponential design.

These are my thougths(guesses) about it.

This was hard to explain in English. Hope it is understandable.
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Old 18th May 2011, 02:06 PM   #1886
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Quote:
This as length will be another due to the area will be larger for the same length at 0 degrees as the mouth is curved. The sides of the Con will be too long.
Sorry, something is wrong here. Have to give it some more thought. Probably the area should be the same but the sides shorter?

For me it "feels" right that the length is the same at every angle.

Last edited by revintage; 18th May 2011 at 02:26 PM.
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Old 19th May 2011, 07:58 AM   #1887
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Quote:
Originally Posted by revintage View Post
For me it "feels" right that the length is the same at every angle.
Hi Lars,

There is no reason why the mouth fronts of the top and bottom panels of the radial horn specifed by Hornresp couldn't be curved or 'rounded' and the mouth sides shortened accordingly, if so desired. Either way, the horn planar area expansion rate will still be correct.

The attachments refer to an exponential horn having S1 = 25 sq cm, S2 = 2700 sq cm and L12 = 50 cm.

The flare profiles shown in attachment 2 assume S1 = 5H x 5W and S2 = 30H x 90W.

If you want curved wavefronts to expand at an exponential rate however, then that is a different story :-).

Kind regards,

David
Attached Images
File Type: png Radial_1.png (10.5 KB, 94 views)
File Type: png Radial_2.png (39.5 KB, 94 views)
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Old 19th May 2011, 08:42 AM   #1888
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Hi David,
The question was how to get a profile that is the same from side to side in a Con horn. Is this a feature I have missed? What I get is a varying profile that is to long(stretched) at the sides.

It is not a curved wavefront I want, it is a curved(radial) hornfront making the profile the same from side to side. This also mean the area is measured radial in the horn. It is, as I understood it right, how a radialhorn is defined. It might though be acoustically wrong.

This is tractrix spreadsheet I found. I haven´t analyzed it though.
Attached Files
File Type: zip bi-radial.zip (124.8 KB, 5 views)

Last edited by revintage; 19th May 2011 at 08:54 AM.
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Old 19th May 2011, 08:56 AM   #1889
Kolbrek is offline Kolbrek  Norway
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Here's a drawing from the Quadratic Waveguide whitepaper by Hughes, showing how a radial horn is defined.

Bjørn
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File Type: gif RadialHorn.gif (23.8 KB, 90 views)
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Old 19th May 2011, 08:58 AM   #1890
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Quote:
Originally Posted by revintage View Post
This also mean the area is measured radial in the horn.
Hi Lars,

In that case, Hornresp will not give you what you want :-).

I misinterpreted your definition of radial horn - my mistake, sorry.

Kind regards,

David
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