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Old 1st February 2011, 01:07 PM   #1601
Mark Kravchenko --- www.kravchenko-audio.com
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In this particular case there is a version of this driver is available in both a sealed and non-sealed versions.
But as John says a large rear enclosure intuitively makes sense as there will be very little effect on the drivers parameters.
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Old 1st February 2011, 01:08 PM   #1602
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Hey David,

It was quite a while since we where arguing about Tractrix at Audioasylum.

I am trying to make use of my "not so very suitable for horn" Altec 414-8As.

Have done some trial&error simming a "hornreflex" midbass to be use up to ca 350Hz.

A 150Hz LeCleach or Spherical horn in front of the driver and a bassreflex at the rear. I will use it in 1*Pi as the horn will be placed on the floor against the sidewall. Two issues:

Can not use "Directivity SPL" when running "Combined response".

Can not add damping in the box.

Any ideas how to approximate this?

Click the image to open in full size.

Last edited by revintage; 1st February 2011 at 01:10 PM.
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Old 2nd February 2011, 01:16 AM   #1603
NEO Dan is offline NEO Dan  United States
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Hi David,
I was attempting a ported rear chamber with entry at the throat in an OD configuration by checking the throat ported option, this does not to appear to be working correctly. The behavior displayed is that of a sealed box, however if I select the rear vented option it appears to work. Is it broke or is it a Pilot error? Maybe I don't understand the throat ported option's function? <---likely

Thanks for putting out such a great tool!
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Old 2nd February 2011, 07:29 AM   #1604
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Hi Lars,

Quote:
Originally Posted by revintage View Post
It was quite a while since we where arguing about Tractrix at Audioasylum.
We weren't arguing, we just agreed to disagree :-).

From a purely theoretical / mathematical standpoint I still can't see how a horn defined by the tractrix curve can be considered to be an exponential horn. The effective profiles may be similar near the throat, but the formulas defining the expansions are fundamentally different, and based on totally different assumptions regarding wavefront shape.

Quote:
Originally Posted by revintage View Post
Can not use "Directivity SPL" when running "Combined response".
That is because Hornresp has no way of knowing how the two sound sources are positioned in relation to each other.

Quote:
Originally Posted by revintage View Post
Can not add damping in the box.
That is correct.

Quote:
Originally Posted by revintage View Post
Any ideas how to approximate this?
Sorry, no :-).

Kind regards,

David
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Old 2nd February 2011, 07:47 AM   #1605
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Quote:
Originally Posted by NEO Dan View Post
Is it broke or is it a Pilot error?
Hi NEO Dan,

I think you might be misinterpreting the meaning of the Hornresp Ap1 parameter :-).

The throat port is the opening in the panel the driver is mounted on, through which the sound from the diaphragm travels into the throat of an offset driver or tapped horn.

See my post #1464 on page 147 of this thread for further details.

Kind regards,

David
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Old 2nd February 2011, 08:39 AM   #1606
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Quote:
Quote:
Originally Posted by revintage
Can not add damping in the box.

That is correct.
Hi again,
Thanks, sorry we couldnīt solve the two issues. The resonace points will anyway be at the same frequencies with or without damping. Will try damping by trial&error as I have an old 150Hz tractrix in my garage. Just to add the box.
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Old 2nd February 2011, 08:57 AM   #1607
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For the influence of damping, try AjHorn or Akabak. In my experience, Try&Error is still a "must" when it comes to damping in a bass horn...
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Old 5th February 2011, 01:46 PM   #1608
Helmuth is offline Helmuth  Netherlands
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Hi David,

Horn response gives a error54 and the projects are gone.

Here the screen shot. What can I do about this problem? It is also not possible to make a new project.
Attached Images
File Type: png Schermafbeelding 2011-02-05 om 15.41.57.png (36.1 KB, 176 views)
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Last edited by Helmuth; 5th February 2011 at 01:49 PM.
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Old 5th February 2011, 01:55 PM   #1609
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@Helmuth
Could you supply some more information about the OS, the filesystems, etc.. on which you ran hornresp? Semms itīs having trouble saving itīs data. Is hornresp stored on the harddisk or are you running it from a USB-Drive?
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Old 5th February 2011, 02:00 PM   #1610
Helmuth is offline Helmuth  Netherlands
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I have osx with virtualbox and windows xp. HORNRESPONSE is on HD and it shout dynamically increase disk-size needed for virtual operating system.
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