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22nd January 2013, 01:47 AM  #3111 
diyAudio Member
Join Date: May 2004
Location: Pensacola, Florida

Yet Another Alternative Horn Curve
Hi David
For an additional option you may want to consider Cornu's spiral. It is a plane curve whose curvature is proportional to its arc length, and whose Cartesian coordinates are given in parametric form by the Fresnel integrals. Also known as a clothoid; Euler's spiral it is similar in form to JMLC’s method of determining horn wall geometry. I suspect that one may well be a parameterization of the other. For details see: Euler's spiral Regards, Bill 
22nd January 2013, 06:13 AM  #3112 
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Join Date: Jun 2007

Hi more10,
To change from Lec to Rad, doubleclick on the Lec label in edit mode and then press R. Kind regards, David
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22nd January 2013, 06:22 AM  #3113 
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Join Date: Jun 2007

Or perhaps it could make you a strong cup of coffee instead :).
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22nd January 2013, 06:39 AM  #3114 
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Join Date: Jun 2007

Hi David_Web,
The radius horn mouth flare tangent angle is given by the Fta parameter. The Horn Segment Wizard enables Fta to be specified as an input value if so desired. Kind regards, David
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22nd January 2013, 06:49 AM  #3115  
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Join Date: Jun 2007

Quote:
Many thanks for bringing this to my attention  it will be fixed in the next release. Kind regards, David
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22nd January 2013, 07:06 AM  #3116  
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Join Date: Jun 2007

Quote:
Thanks for the suggestion  I suspect that it might be a little too esoteric for Hornresp though :). Kind regards, David
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22nd January 2013, 09:12 PM  #3117  
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Join Date: May 2009
Location: New Zealand

Quote:
It is very close to an exponential profile. See here: Ever think of building a Cornu Spiral horn? Now you can! 

23rd January 2013, 06:51 AM  #3118 
diyAudio Member
Join Date: Jun 2007

Hornresp Update 3100130123
Hi Everyone,
1. Schematic diagram horn profiles are now perfectly symmetrical for all screen resolutions and text size settings. Previously, onepixelwidth "quantisation error" discrepancies could sometimes be seen. The change is purely cosmetic, and the calculated results are not affected in any way. The attached screenprints show an example of the "old" and "new" profiles. Note the subtle differences  particularly near the throat. 2. The radius horn segment wizard bug reported by David_Web has been fixed. Kind regards, David
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24th January 2013, 06:34 AM  #3119 
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Join Date: Jun 2007

Hornresp Update 3100130124
Hi Everyone,
A small spurious spike present at high frequencies in the throat acoustical impedance chart results for some radius horns, has now been eliminated. See old / new comparison screenprints attached. Kind regards, David
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24th January 2013, 10:51 AM  #3120 
diyAudio Member
Join Date: Jul 2004
Location: Gone on holiday again. back soon.

David and others,
could you talk us through what the "shape" of those plots is telling us? There are some small ripples on the flanks, what do they mean? There is an asymetry over the peak, what does that mean? Why does the black have a more pronounced ripple at ~900Hz What is the difference in the red and the black? Why the difference in slopes before and after the peak? Red is slow before and fast above, whereas black is fast below and slow above? Why is the red at zero at both limits whereas the black is zero at low limit and 1 at the high limit? Is it exactly 1? Why 1, what does that mean?
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regards Andrew T. Sent from my desktop computer using a keyboard 
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