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17th September 2017, 03:45 PM  #7871 
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Join Date: Jan 2009
Location: Columbus, Ohio

These are examples of exponential subwoofer horns. If you are not building something similar, then you need to be modeling a parabolic enclosure.

18th September 2017, 06:05 AM  #7872 
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Join Date: Jun 2007

The second example appears to be a tractrix or spherical wave horn  the mouth flare tangent angle is close to 90 degrees.
Just to clarify, the above statement only applies to horns with two parallel sides  in which case the system needs to be modelled using multiple parabolic segments to approximate the desired overall exponential profile (see attachment). A singlesegment parabolic horn would not be a good design choice for a bass system :).
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18th September 2017, 02:35 PM  #7873 
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Join Date: Jan 2009
Location: Columbus, Ohio

The pic was to show that all sides expand in an exponential horn whether round or square. Here is a better example for a round exponential horn.
Last edited by BP1Fanatic; 18th September 2017 at 02:40 PM. 
18th September 2017, 03:45 PM  #7874  
Mark Kravchenko
diyAudio Member

Quote:
Kinda looks like a conical horn there buddy 

19th September 2017, 06:50 AM  #7875 
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Join Date: Jun 2007

More like a conical megaphone  complete with handle. A bit small to be used as a subwoofer, though :).
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19th September 2017, 02:14 PM  #7876 
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Join Date: Jan 2009
Location: Columbus, Ohio

My mistake!

21st September 2017, 12:23 PM  #7877 
diyAudio Member
Join Date: Jun 2011

A little offtopic.
Can anybody provide files to calculate the horn from here: Quarter Wavelength Loudspeaker Design ? 
21st September 2017, 02:55 PM  #7878  
Mark Kravchenko
diyAudio Member

Quote:
At least for the horn design and specification side of things. Are you looking for the mathematical derivation of a particular horn type? 

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