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Old 23rd April 2011, 08:04 AM   #1851
reemoo is offline reemoo  United States
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David,

You are amazing! Just what I wished for.
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Old 23rd April 2011, 08:10 AM   #1852
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Quote:
Originally Posted by reemoo View Post
Just what I wished for.
Hi reemoo,

Some wishes do come true then, it would seem :-).

Kind regards,

David
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Old 23rd April 2011, 02:05 PM   #1853
AndrewT is offline AndrewT  Scotland
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It is Easter anniversary, miracles can happen!
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Old 27th April 2011, 07:49 AM   #1854
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Default Hornresp Update

Hi Everyone,

A check box has now been added to the Hornresp polar map to enable results to be shown normalised to the on-axis response, if required.

My thanks to John Sheerin for raising the issue.

Kind regards,

David
Attached Images
File Type: png Polar1.png (110.7 KB, 247 views)
File Type: png Polar2.png (111.8 KB, 238 views)
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Old 27th April 2011, 09:55 AM   #1855
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Hello David,
Many suggestions now. But couldn´t you make the "checked pattern(?)" in the printouts with thicker lines? Can´t see them in my printouts. Have tried several printers.
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Old 27th April 2011, 02:47 PM   #1856
Jmmlc is offline Jmmlc  France
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Hello David,

The on-axis normalization button is a great tool!

Here attached a comparison between a Le Cleac'h horn and an OS waveguide of the same dimension.

Doesn't need any coment...

Best regards from Paris, France

Jean-Michel Le Cléac'h




Quote:
Originally Posted by David McBean View Post
Hi Everyone,

A check box has now been added to the Hornresp polar map to enable results to be shown normalised to the on-axis response, if required.

My thanks to John Sheerin for raising the issue.

Kind regards,

David
Attached Images
File Type: gif polars_.gif (106.6 KB, 215 views)
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Old 27th April 2011, 03:21 PM   #1857
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That's a bit misleading - you're comparing an OS horn with no round over at the mouth to your flair which does have a round over. Of course the polar map will be smoother for the LC flair in this case, but if you actually build an OS flair with a sharp corner at the mouth you are missing the point. What is obvious is that the OS even without a proper mouth termination has pretty much constant directivity within its usable bandwith while the LC flair has continuously increasing directivity.
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Old 27th April 2011, 03:52 PM   #1858
AndrewT is offline AndrewT  Scotland
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posts1854 and 1856.
Please tell us how to read what those pics are telling us.
And tell us, when we need to create them and how to create them.
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Old 27th April 2011, 04:16 PM   #1859
Jmmlc is offline Jmmlc  France
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Hello John,

I agree that's a little bit misleading so the comparison between Hornresp results and real mesurements should be more interesting:

Real measurements for a Le Cléac'h horn:

http://www.horns.pl/images/horns/jmlc200t.jpg

polar: http://www.diyaudio.com/forums/attac...dir_matlab.png

real measurement for an OS waveguide having the recommanded round over at the mouth

http://www.diysoundgroup.com/images/large/OSWG_12.jpg

polar: http://www.diysoundgroup.com/images/large/OSWG_Sono.jpg

No comment again...

Best regards from Paris, France


Quote:
Originally Posted by John Sheerin View Post
That's a bit misleading - you're comparing an OS horn with no round over at the mouth to your flair which does have a round over. Of course the polar map will be smoother for the LC flair in this case, but if you actually build an OS flair with a sharp corner at the mouth you are missing the point. What is obvious is that the OS even without a proper mouth termination has pretty much constant directivity within its usable bandwith while the LC flair has continuously increasing directivity.

Last edited by Jmmlc; 27th April 2011 at 04:42 PM.
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Old 28th April 2011, 06:01 AM   #1860
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Quote:
Originally Posted by revintage View Post
But couldn´t you make the "checked pattern(?)" in the printouts with thicker lines?
Hi Lars,

Just to clarify - by "checked pattern(?)" do you mean the chart gridlines?

Kind regards,

David
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