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Old 6th September 2010, 10:45 AM   #1421
Jmmlc is offline Jmmlc  France
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Hello Mige0,

The best approach is IMHO the Kirkeby filtering as used by Angelo Farina in his Aurora Plugins.

The linearization must be performed inside a chosen interval of frequency. In such a software as Hornresp it is better to have some automatisation so the limit frequencies inside which the linearization has to be performed have to be automatically estimated.

See an example of the parametering used in Aurora in order for the Kirkeby plug-in.
http://pcfarina.eng.unipr.it/Aurora_...p_image002.jpg

You should perform a search on Internet with the words:
"Nelson/Kirkeby frequency-domain regularisation"

An example of paper is here:
http://kom.aau.dk/project/navcom/Cou...6_mm3_note.pdf

Best regards rfom Paris, France


Quote:
Originally Posted by mige0 View Post
One thing I miss (or have not focused too much until now) is the possibility to optionally equalize to flat FR before performing a wavelet / spectrogram analysis.

This would highlight the differences in CMP behaviour for different designs even better IMO.
I mean - the most natural thing done until now and being done in the future is to equalize for flat FR (or any house curve of desire), and it might be pretty revealing to have a tool at hand that shows to what extend the results still differ from ideal in the time domain (spectrogram) due to CMP.
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Old 6th September 2010, 06:39 PM   #1422
mige0 is offline mige0  Austria
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Location: Austria, at a beautiful place right in the heart of the Alps.
Thanks for the links, Jean-Michel, will give Kirkeby a try and see what I can get out of it


Michael
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Old 7th September 2010, 12:56 PM   #1423
Jmmlc is offline Jmmlc  France
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Hello Michael,

I think the following paper is a good start:

http://web.uvic.ca/~hgiesbre/499/far...226-AES122.pdf

the Kirkeby algorithm is described.

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 23rd September 2010, 08:24 PM   #1424
witasso is offline witasso  Poland
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Dear Mr McBean:
There is a problem with exporting data from hornresp at Schematic diagram / export horn data / horn cross-section dimensions on option other than Con (Exp and Uni).
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Old 26th September 2010, 06:32 AM   #1425
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Quote:
Originally Posted by witasso View Post
There is a problem with exporting data from hornresp at Schematic diagram / export horn data / horn cross-section dimensions on option other than Con (Exp and Uni).
Hi witasso,

Thanks for the feedback. I have not been able to generate the error message you are seeing - the functionality works fine for me. Could you please post a screenprint of your Input Parameters window so that I can conduct some further tests using the same data as you.

Do you have the latest release of Hornresp, Product Number 2800-100918?

Kind regards,

David
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Old 28th September 2010, 08:17 AM   #1426
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Quote:
Originally Posted by David McBean View Post
I have not been able to generate the error message you are seeing.
Hi witasso,

On further testing I have found that I can generate the same error as you, under some conditions.

I will let you know when the bug is fixed.

Kind regards,

David
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Old 28th September 2010, 08:36 AM   #1427
witasso is offline witasso  Poland
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Dear Mr McBean:
I encountered problems searching the exact conditions when this phenomenon appears and no access to the web few days, sorry.
Many thanks for testing for the error.
Regards.
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Old 28th September 2010, 12:25 PM   #1428
Elias is offline Elias  Finland
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Hello,

I was always wondering why they name it 'Kirkeby method' since it's a straight Wiener-Kolmogorov deconvolution, known for 70 about years??


- Elias


Quote:
Originally Posted by Jmmlc View Post
The best approach is IMHO the Kirkeby filtering as used by Angelo Farina in his Aurora Plugins.

The linearization must be performed inside a chosen interval of frequency. In such a software as Hornresp it is better to have some automatisation so the limit frequencies inside which the linearization has to be performed have to be automatically estimated.

See an example of the parametering used in Aurora in order for the Kirkeby plug-in.
http://pcfarina.eng.unipr.it/Aurora_...p_image002.jpg

You should perform a search on Internet with the words:
"Nelson/Kirkeby frequency-domain regularisation"

An example of paper is here:
http://kom.aau.dk/project/navcom/Cou...6_mm3_note.pdf

Best regards rfom Paris, France
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Old 29th September 2010, 06:46 AM   #1429
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Default Hornresp Bug Fix

Quote:
Originally Posted by David McBean View Post
I will let you know when the bug is fixed.
Hi witasso,

Hopefully the bug you found has now been fixed. The latest Hornresp release is Product Number 2800-100929.

Thanks again for the feedback.

Kind regards,

David
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Old 8th October 2010, 06:10 PM   #1430
djn is offline djn  United States
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Hi All, I am here asking for help...nay, begging for help. I have a new pair of speakers that are neither fish nor fowl. I have some ideas of what direction to take them but I am just plain stupid when it comes to computer programs and in particular Hornresp.

Here are pix of the speakers. They are large horns with a Fostex FE126e driver in them. They run full range with the Alpha 15a woofs in "H" frames. They actually sound very nice. Open, detailed, live, but from 200hz (where the 126e kicks in) to around 3.5khz the signal is much lower in volume than above 3.5khz, where it REALLY kicks in.

I don't know is this is a result of the horn design or the driver. I do know the 126e has a fairly substantial peak in the higher freqs.

My options are to find a better, flatter driver like the Mark Audio Alpair7, or, turn these into true midbass horns by whacking the back plate off and putting a 10 or 12 or 15" driver back there with the proper compression ratio.

Before I do that though, I figure I show know what these will do as a horn modeled in HornResp.

They are conical flairs with open baffle

The mouth is 22.75" wide by 46" tall.

They are 22.75" straight line deep

The throat (without the back plate) is 6.5" wide by 5.5" tall.

I know this is a subwoofer forum, but can one of fine gentleman help me figure out what to do with these. Thanks in advance......much appreciated.
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