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Spreadsheet for Folded Horn Layouts...
Spreadsheet for Folded Horn Layouts...
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Old 3rd November 2017, 07:47 AM   #301
David McBean is offline David McBean  Australia
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Will be in the next update, if all goes according to plan.
The update has now been released.

Hornresp
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Old 3rd November 2017, 10:30 AM   #302
Brian Steele is offline Brian Steele  Grenada
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The update has now been released.

Hornresp
Thanks - I'm definitely going to have a play with it today!
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Old 4th November 2017, 04:04 AM   #303
Brian Steele is offline Brian Steele  Grenada
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David's update to Hornresp and some "advances" I've recently made in emulating conical and exponential expansion via parabolic segments in workbooks led me to have another look at the workbook I put together for the "Keystone' fold. It looks like the S2-S3 section can be best sim'd as a conical section, so L12=Par, L23=Con, L34=Par. In fact, the workbook now shows why that short internal panel at the top is slightly off 90 degrees to the internal panel near the rear - it improves the approximation of the L23 section to a conical expansion. I might address that in a later version of this workbook. Otherwise the "error" line in the expansion graph is basically flat, showing that the Hornresp sim data in the workbook can describe the S1-S4 section of the Keystone pretty closely.

Of course it's the L45 section that makes a lot of the difference in the response of the Keystone, and I have to find a better way to approximate that in the model. Time to have a read of that long thread again - key details I need are the size of the mouth and an idea of how far from the center of the driver the approximate center of the mouth is located.
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Old 6th November 2017, 10:04 AM   #304
USRFobiwan is offline USRFobiwan
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Spreadsheet for Folded Horn Layouts...
How can something be conical if the construction is not conical. Does this par,con,par sim actually going to comparable to the a non conical build measurement?
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Old 6th November 2017, 11:46 AM   #305
akvaro is offline akvaro  Spain
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I think conical refers to a constant expansion in the horn not a conical section, par parabolic expansion and exp exponential expansion.
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Old 6th November 2017, 12:18 PM   #306
USRFobiwan is offline USRFobiwan
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Spreadsheet for Folded Horn Layouts...
Seems like i had a brainfart this morning...
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Old 6th November 2017, 03:39 PM   #307
weltersys is offline weltersys  United States
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Originally Posted by Brian Steele View Post
Of course it's the L45 section that makes a lot of the difference in the response of the Keystone, and I have to find a better way to approximate that in the model. Time to have a read of that long thread again - key details I need are the size of the mouth and an idea of how far from the center of the driver the approximate center of the mouth is located.
Another "key detail" is the area difference between the upper and lower portion of the approximate area center of the Keystone mouth. Moving the equivalent exit area up and down on the exit panel does not have the same effect as the Keystone shape imparts. Hornresp simulates a circular exit, and though a square approximates a circle, a Keystone shape does not.

Happy reading!
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Old 6th November 2017, 04:09 PM   #308
Brian Steele is offline Brian Steele  Grenada
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Originally Posted by USRFobiwan View Post
How can something be conical if the construction is not conical. Does this par,con,par sim actually going to comparable to the a non conical build measurement?
Hornresp sims are limited to four sections (L12, L23, L34, L45) of which each section can be Parabolic, Conical, or Exponential (ok, Hornresp can do Hyperbolic too, but there are certain limitations applied), and for a horn consisting of various segments folded up into a rectangular box, parabolic expansion typically applies, and that's the approach I take for segments in the horn that represent one of the Hornresp sections referred to above, particularly if there are no folds involved.

However, if several segments and folds are being grouped together under one Hornresp section (this typically happens for the "L23" section for a tapped horn), it is possible to emulate conical or exponential expansion in some cases by careful choice of the lengths of those segments - basically approximating conical or exponential expansion by using a series of connected parabolic segments.
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Old 3rd December 2017, 10:31 AM   #309
Dhp507 is offline Dhp507
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Hi Brian , if you wanted to change the driver arrangements in the folding spreadsheets. How does one go about it?
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Old 3rd December 2017, 11:18 AM   #310
Brian Steele is offline Brian Steele  Grenada
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Hi Brian , if you wanted to change the driver arrangements in the folding spreadsheets. How does one go about it?
What do you mean? Give an example of what you're trying to do..
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