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Old 13th June 2011, 12:29 PM   #1971
Mark Kravchenko
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Quote:
I can convert it to pints though.
How many pint's before you forget it anyway?

Nice points you guys are making.

Running simulations on more difficult drivers and the tips to do so are very useful.

And I can vouch for the similarity between the two types of Dynaudio midranges. As far as I can remember the greatest difference was the shape of the face plate. One was flared with a partial horn loading and one used a flat face plate.

Mark
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Old 13th June 2011, 06:31 PM   #1972
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Quote:
Originally Posted by revintage View Post
Vas=0,1dm3 is what I have found. But using the std formula I get 0,626dm3 (or is 0,0626dm3)?
Thanks so much!

I used 0.1 and got a throat area of 3.6 cm2, mouth area of 368 cm2. I used those in Hornresp and got the same kind of horrible response. If I reduced the throat size to something like 1 cm2, the response improves a lot. I'm pretty sure that Bruce's horn has a 2" square throat. I need to measure this beast in real life.
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Old 13th June 2011, 07:27 PM   #1973
AndrewT is online now AndrewT  Scotland
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Since I am not of "continental" upbringing, then could you explain what a decimetre has to do with metric.
As far as I know it is neither cgs units (SI) nor MKs units (metric)

If decimetre is allowed as a well known and used but "continental" exception, then does the volume unit become cubic decimetre or dm^3 or something else?
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Old 14th June 2011, 07:26 AM   #1974
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Quote:
Originally Posted by mwmkravchenko View Post
How many pint's before you forget it anyway?

Nice points you guys are making.

Running simulations on more difficult drivers and the tips to do so are very useful.

And I can vouch for the similarity between the two types of Dynaudio midranges. As far as I can remember the greatest difference was the shape of the face plate. One was flared with a partial horn loading and one used a flat face plate.

Mark
I have the D54, which has the partial horn loaded faceplate. The D54 AF has flat faceplate. I have the data sheets for both and the T/S parameters are slightly different.
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Old 17th June 2011, 06:18 PM   #1975
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Default Run-time error 11 divide by 0

Hi, idont know where to post this
it is for david, ive found a bug, get this error simulating a rear vented horn, at the wizard, selecting the Ang to 0 PI in the slider...

my HR ver 28.40 prod # 2840-110505

thanks for such a great tool!!
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Old 18th June 2011, 06:36 AM   #1976
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Originally Posted by polakenfold View Post
Hi, idont know where to post this
it is for david, ive found a bug, get this error simulating a rear vented horn, at the wizard, selecting the Ang to 0 PI in the slider...
my HR ver 28.40 prod # 2840-110505
Hi polakenfold,

Many thanks for the feedback - you have posted it in exactly the right place :-). Amazingly by sheer coincidence this very same bug was reported to me via e-mail on 2 June 2011 by another user. The fault was fixed in Product Number 2840-110603 released on 3 June. All you need to do to overcome the problem is to download a new copy of Hornresp :-).

The latest version is Product Number 2840-110609.

Kind regards,

David
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Old 19th June 2011, 08:13 AM   #1977
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Quote:
Originally Posted by David McBean View Post
The latest version is Product Number 2840-110609.
Hi Everyone,

I canít resist tweaking things - the latest Hornresp release is 2840-110619.

When the Eg slider in the Loudspeaker Wizard is set to zero the Rg slider is now disabled and a "Constant Velocity" reminder message is displayed, as shown in the attached screenprint.

Kind regards,

David
Attached Images
File Type: png Wizard.png (22.8 KB, 191 views)
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Old 21st June 2011, 04:36 AM   #1978
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David,
I have a question about the port used for rear loading (or the port of a reflex enclosure).

From searching this thread I have determined that end correction is included in the port length displayed. Is this correction included when exporting to AkAbak script? AkAbak does not include end correction by default. It is not required for the "outside" end of the port because the "radiator" takes care of it, but it appears that I need to add end correction for the "inside" end of the port. Do you agree, or have I totally misunderstood the physics?
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Old 21st June 2011, 08:18 AM   #1979
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Hi Don,

Quote:
Originally Posted by Don Hills View Post
I have determined that end correction is included in the port length displayed.
The Lpt value shown is the actual physical length - it does not include the "inside" end correction, which is automatically added-on by Hornresp as required, internal to the program.

Quote:
Originally Posted by Don Hills View Post
Is this correction included when exporting to AkAbak script?
No (because as stated above, the Lpt value is the actual physical length, not the length including the "inside" end correction).

Quote:
Originally Posted by Don Hills View Post
AkAbak does not include end correction by default.
Correct.

Quote:
Originally Posted by Don Hills View Post
It is not required for the "outside" end of the port because the "radiator" takes care of it, but it appears that I need to add end correction for the "inside" end of the port.
Correct, when using AkAbak.

Kind regards,

David
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Old 21st June 2011, 11:03 PM   #1980
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Thanks, David.
In summary, if I build an enclosure with the port length as specified by Hornresp, it should measure similarly to the simulated enclosure. But in AkAbak, I have to manually add one end correction to the length provided by Hornresp in order to get a correct simulation.

This was one of those "Doh!" moments. (I'm writing a guide which details how to simulate a Weems-style DCR in AkAbak, using a reflex box export from Hornresp as a template. End correction is important to accuracy of the simulation because there are multiple ports.)
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