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Old 14th August 2014, 11:23 PM   #4781
tb46 is offline tb46  United States
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Hi David,

Thanks for taking another look at this.

Regards,
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Old 15th August 2014, 06:54 AM   #4782
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Quote:
Originally Posted by tb46 View Post
Thanks for taking another look at this.
Hi Oliver,

You're welcome :-).

After giving it much thought and following further testing I have decided to remove the absorbent filling material > 60 dB invalid result trap but not to include any cautionary message, as it could possibly be misleading / confusing. Invalid results are unlikely to be generated if realistic values of absorbent filling material are used.

As an example, the grey trace on the attached screenprint shows the power response for the default record with resonances masked. The light red trace on the far right of the chart shows the invalid result generated when the Fr1 value of absorbent filling material in segment 1 is specified unrealistically high value at 85000. This amount of filling would never be used in practice, and the error is so obvious anyway that it should not be an issue.

Kind regards,

David
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Old 15th August 2014, 06:57 AM   #4783
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Default Hornresp Update 3480-140815

Hi Everyone,

CHANGE

The absorbent filling material > 60 dB invalid result trap has been removed. See Post #4780 for details.

My thanks to Oliver for prompting me to re-visit this issue.

Kind regards,

David
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Old 15th August 2014, 07:44 AM   #4784
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Quote:
Originally Posted by David McBean View Post
unrealistically high value at 85000.
CORRECTION

"unrealistically high value at 85000" should read "unrealistically high at 85000".

My bad :-).
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Old 15th August 2014, 01:34 PM   #4785
tb46 is offline tb46  United States
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Default Posts #4749~~4784

Hi David,

Thanks for removing the absorbent filling invalid result cautionary message. I don't think it added anything to your excellent program. Maybe sometimes less is more? :-)

Regards,
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Old 16th August 2014, 05:46 AM   #4786
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Quote:
Originally Posted by tb46 View Post
Maybe sometimes less is more? :-)
Hi Oliver,

I totally agree. As far as I am concerned, the simpler the better :-).

Kind regards,

David
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Old 16th August 2014, 04:19 PM   #4787
kees52 is offline kees52  Netherlands
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Hi David

In tools where I can switch the rear chamber to lined, ported or rear vented has this invluence on the outcome or is this just for testing what the sound does in that chamber?

I do use the normal ap1 lpt for closed rear chamber.

thanks.

kees
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Old 17th August 2014, 06:25 AM   #4788
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Quote:
Originally Posted by kees52 View Post
In tools where I can switch the rear chamber to lined, ported or rear vented has this invluence on the outcome or is this just for testing what the sound does in that chamber?
Hi Kees,

The Tools > Chamber Type menu command can have up to three menu sub-commands, depending upon the system configuration:

Rear Lined - Input parameters are Fr and Tal
Rear Vented - Input parameters are Ap and Lpt
Throat Adaptor - Input parameters are Ap1 and Lpt

(The Throat Adaptor menu sub-command becomes Throat Ported for offset driver and tapped horn systems)

To illustrate the differences between the three options:

Step 1 - Make a copy of default record number 1 and change the value of Fr from 40000 to 40. Attachment 1 shows the schematic diagram. The rear chamber is sealed and lined. The acoustical lining has an airflow resistivity of Fr and a thickness of Tal.

Step 2 - Double-click on the Fr or Tal label to change to Ap and Lpt. Alternatively, select menu command Tools > Chamber Type > Rear Vented. Attachment 2 shows the new schematic diagram. The rear chamber is now unlined but vented. The port tube vent has a cross-sectional area of Ap and an axial length of Lpt.

Step 3 - Double-click on the Ap or Lpt label to change to Ap1 and Lpt. Alternatively, select menu command Tools > Chamber Type > Throat Adaptor. Attachment 3 shows the new schematic diagram. The rear chamber is now sealed and unlined but a conical throat adaptor has been inserted between the throat chamber and horn segment 1. The throat adaptor has an inlet cross-sectional area of Ap1 and an axial length of Lpt.

For offset driver and tapped horns, the throat adaptor becomes a port between the throat chamber and the entry point into the horn.

The three options will affect the system performance in different ways.

Kind regards,

David
Attached Images
File Type: png Attach_1.png (39.4 KB, 117 views)
File Type: png Attach_2.png (39.6 KB, 115 views)
File Type: png Attach_3.png (39.9 KB, 112 views)
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Old 17th August 2014, 06:58 AM   #4789
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Quote:
Originally Posted by David McBean View Post
The three options will affect the system performance in different ways.
The differences in 'resonances not masked' system power response:

Attachment 1 - Step 1 configuration.
Attachment 2 - Step 2 configuration.
Attachment 3 - Step 3 configuration.
Attached Images
File Type: png Attach_1.png (56.9 KB, 110 views)
File Type: png Attach_2.png (59.3 KB, 29 views)
File Type: png Attach_3.png (59.1 KB, 25 views)
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Old 24th August 2014, 01:38 PM   #4790
kees52 is offline kees52  Netherlands
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Hi David

I have it now, so the next question arrives, when export to a horn I need two panels to be straight and flat (woofer on it so exp do not fit) and the other two (weight) have to be exponential flare, like on picture, How I do this?, throat has to be for example has not to be effected to much, it is 6 x 6 cm for example. I can not figure out well.

Never mind I think I have discover it now, maybe you can confirm that, see pictures.



thanks for al your help.

kees
Attached Images
File Type: jpg ScreenHunter_186 Aug. 24 15.41.jpg (29.5 KB, 26 views)
File Type: jpg ScreenHunter_185 Aug. 24 15.41.jpg (23.3 KB, 27 views)
File Type: jpg ScreenHunter_187 Aug. 24 15.42.jpg (23.0 KB, 25 views)

Last edited by kees52; 24th August 2014 at 01:44 PM.
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