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Old 15th October 2011, 11:42 AM   #2301
NEO Dan is offline NEO Dan  United States
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Thanks David it's working nicely
So this means "everything?" is calculated at once?
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Old 16th October 2011, 04:35 AM   #2302
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Originally Posted by NEO Dan View Post
So this means "everything?" is calculated at once?
Hi Dan,

In effect, yes.

System efficiency, sound pressure and particle velocity are now calculated at the same time as the other results - it is no longer necessary for the chart to be displayed to generate the results.

Kind regards,

David
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Old 16th October 2011, 09:56 PM   #2303
sannax is offline sannax  Norway
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When calculating a LeCleach and exporting the data, is the value "y" radius or diameter?
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Old 16th October 2011, 10:28 PM   #2304
sannax is offline sannax  Norway
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Edit: doublepost
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Old 17th October 2011, 07:20 AM   #2305
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Originally Posted by sannax View Post
When calculating a LeCleach and exporting the data, is the value "y" radius or diameter?
Hi sannax,

Y is the radius in mm.

This can be readily confirmed by checking that Y at X = 0 is equal to Sqrt(S1 / Pi).

To make things a bit clearer I will change the column headings from X and Y to Length and Radius in the next release. This will then also make them consistent with the headings used for the other two Le Cléac'h horn schematic diagram export options.

Thanks for asking the question.

Kind regards,

David
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Old 17th October 2011, 04:09 PM   #2306
tb46 is offline tb46  United States
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Default Post #2300

Hi David,

Just downloaded V2870-111016, and all looks better.

Thanks for the continuing effort.

Regards,
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Old 17th October 2011, 04:12 PM   #2307
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Does anyone have any advice on folding up a midbass horn? The horn I created in your software is too big for my living room as a straight horn. I'm trying to figure out how to take this straight horn and make it into a La Scala type of horn. The problem I'm having is where to cut the flare such that the cut part fits into the width of the mouth of the horn. See here:
Folding a Midbass Horn
for more details.
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Old 17th October 2011, 07:55 PM   #2308
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Originally Posted by weltersys View Post
You don't seem to be thinking in terms of wavelength.
The wavelength of 35 Hz is about 32 feet long, 1/4 wavelength is 8 feet. The center to center distance between the mouth openings is only 26.5 inches, just over 2 feet.

The two cabinets have almost exactly 6 dB of gain when placed together and powered by the same voltage, if they were not actually "closely coupled", the gain would be less and the frequency response would be different.

The Keystone design mouth to frontal area ratio is a bit higher (smaller mouth compared to frontal area) than a DSL TH-115 or TH-118, or similar designs.

The DSL TH-115, with over 50% of the frontal area used by the mouth, also has no change in the LF corner when used in multiples.

The Keystone is similar in mouth to frontal area as the more usual tall single fold TH like the William Cowan 60 hertz tapped horn Hornresp simulation that David McBean chose to use as an example.

Art Welter
Is 1/4 wavelength the standard for determining "tightly coupled" in terms of 1/4 space, 1/2 space, etc? In other words, if the mouth of the horn is within 1/4 wavelength of any flat surface, then that surface "counts" as long as it's strong and basically air tight? So, if the mouth of a horn is within 1/4 wavelength of the wall of a room, and the horn is sitting on the floor, then that horn is radiating into 1/4 space?
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Old 17th October 2011, 08:21 PM   #2309
sannax is offline sannax  Norway
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Quote:
Originally Posted by David McBean View Post
Hi sannax,

Y is the radius in mm.

This can be readily confirmed by checking that Y at X = 0 is equal to Sqrt(S1 / Pi).

To make things a bit clearer I will change the column headings from X and Y to Length and Radius in the next release. This will then also make them consistent with the headings used for the other two Le Cléac'h horn schematic diagram export options.

Thanks for asking the question.

Kind regards,

David
Thanks David!

Chris
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Old 18th October 2011, 07:16 AM   #2310
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Originally Posted by dirkwright View Post
Is 1/4 wavelength the standard for determining "tightly coupled" in terms of 1/4 space, 1/2 space, etc?
Hi dirkwright,

For what it's worth - Hornresp assumes that there is no air gap at all between horn mouth and the surface(s) defining the solid angle 'Ang' into which the horn radiates.

Any opening will compromise the theoretical design to some degree. 1/4 wavelength seems rather large to me - I am not sure that it would be considered to be "small compared to a wavelength", which is the (somewhat ambiguous) requirement normally specified.

Kind regards,

David
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Last edited by David McBean; 18th October 2011 at 07:19 AM.
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