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Old 12th June 2018, 08:44 AM   #8351
rertrobaer is offline rertrobaer
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Hi,

Quote:
Originally Posted by David McBean View Post
I used Ang = 2.0 x Pi in my example. It would appear that you are using Ang = 1.0 x Pi.
Ok, so this fundemantal freq is reliable.
Do you use speed of sound c=340m/s in hornresp for calculation? Is there a open bound correction added(0.5*sqrt(S2/pi)) ?

Sorry if this all has been asked already, but this thread is so very long ;-)

Retrorbaer
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Old 12th June 2018, 09:14 AM   #8352
David McBean is offline David McBean  Australia
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Hi Retrorbaer,

Hornresp assumes that the velocity of sound in air is 344 metres per second, and that the density of air is 1.205 kilograms per cubic metre. It's all in the Help file :-).

An end correction is not applicable because Hornresp takes into account the actual acoustical impedance loading the horn mouth. (The purpose of an end correction is simply to approximate the effect of a terminating impedance).

Kind regards,

David
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Old 12th June 2018, 02:18 PM   #8353
mwmkravchenko is offline mwmkravchenko  Canada
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Hornresp
I keep missing emails from the forum. The things I miss!

Thanks for all the updates David. And the improvements. Good to have the additional options in the filter wizard.
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Old 13th June 2018, 06:19 AM   #8354
David McBean is offline David McBean  Australia
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Hi Mark,

diyAudio.com has had some emailing problems recently. Hopefully everything is now back to normal.

Kind regards,

David
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Old 13th June 2018, 08:41 PM   #8355
mwmkravchenko is offline mwmkravchenko  Canada
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Hornresp
I hope so. I don't follow to many other threads than this one. Sometimes I go looking but I tend to spend my time on more beneficial endeavors.
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Old 14th June 2018, 01:09 AM   #8356
Etocynned is offline Etocynned
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Question...when modelling multiple drivers in a vented box( 4) is it safe to say they each see 1/4 of the vent area?
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Old 14th June 2018, 07:46 AM   #8357
David McBean is offline David McBean  Australia
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Hi Etocynned,

I guess you could think of it that way, but it all hinges on what you are really trying to achieve. As far as Hornresp is concerned, the multiple drivers in a vented box system are modelled as a single composite driver that "sees" the complete chamber and port tube.

Why do you ask the question - just out of general curiosity, or did you have something specific in mind?

Kind regards,

David
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Old 14th June 2018, 09:43 PM   #8358
Twellmann is offline Twellmann  Denmark
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Hi David

How do you calculate the angle horn angle?
I'm sitting here with formula for a hypex horn, trying to calculate the angle, but we are not on the same page. Do you use some numeric derivation or have you found the true derivative of the function?
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Old 14th June 2018, 11:40 PM   #8359
Twellmann is offline Twellmann  Denmark
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Smile Found it

Quote:
Originally Posted by Twellmann View Post
Hi David

How do you calculate the angle horn angle?
I'm sitting here with formula for a hypex horn, trying to calculate the angle, but we are not on the same page. Do you use some numeric derivation or have you found the true derivative of the function?
Sorry to bother you, I found the error in my script. Now I only have rounding error on the fifth or sixth decimal.
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Old 15th June 2018, 08:36 AM   #8360
David McBean is offline David McBean  Australia
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Hi Twellmann,

Glad to hear that you found the reason for the difference :-).

To answer your question - Hornresp uses the true derivative of the function to calculate the hyperbolic-exponential horn tangent angle.

Kind regards,

David
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