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David McBean 22nd March 2008 07:05 AM

Hornresp
 
2 Attachment(s)
Hi Everyone,

Just letting you know that Hornresp Version 18.00 has now been released.

The Tapped Horn Wizard tool has been significantly enhanced. For a given overall horn length, flare rate and driver specification, the optimum driver position can be determined more easily than before.

Note that there are three ‘Interaction’ options. The operation of the first two should be pretty obvious from the titles. The third ‘L12 & L34 Linked’ setting enables the user to “slide” the driver along the mounting baffle / separating panel towards or away from the 180 degree bend (similar to changing the acoustic path length of a slide trombone).

Hopefully the Tapped Horn Wizard is now a far more useful tool. Enjoy :-).

Kind regards,

David

cowanaudio 22nd March 2008 10:06 AM

WOW, that's great David, thanks again for your continuing efforts!

PS I only just noticed that a large L1-2 can give a very big improvement in response shape. It causes a big notch that removes the first peak, leaving a response that is very easy to crossover. An L1-2 of 70cm works brilliantly on a 35Hz tapped horn I'm playing with. It uses up very little space because the area at that end of the horn is so small (even tapering to zero if you want.) I never noticed this effect before.

Cheers

William Cowan

David McBean 23rd March 2008 07:39 AM

Quote:

Originally posted by cowanaudio
WOW, that's great David, thanks again for your continuing efforts!
Thanks William - the new wizard certainly makes it a lot easier to “tune” a tapped horn, and it is also great fun to use :-).

Incidentally, I found an error in the code controlling the L12 and L34 scroll bars - please use Product Number 1800-080323 or higher.

Kind regards,

David

kstrain 23rd March 2008 09:04 AM

Brilliant & thanks
 
David,
the latest version is great!

My TH, finished yesterday, was designed using v17 (and a little AkAbaK). Thank you. Measurements to follow elsewhere, when I convince myself that I have something reliable to show.

The TH wizard would certainly have accelerated the process. This is particularly the case as - knowing that what I built would be an approximation - I looked for low sensitivity to L12 and L34 which are probably the most difficult parameters to hit spot on, given they are about the same order as the driver dimensions and transverse directions in the horn. Sliding the sliders and seeing minimal changes to the response was something of a relief.


Ken

MaVo 23rd March 2008 11:39 AM

A very nice idea, i like it alot. With growing CPU power, programs where you change a variable and instantly see the frequency response change, instead of clicking on "compute it", seem to be the logical next step.

David McBean 28th March 2008 06:32 AM

Thanks Ken, thanks MaVo.

Hornresp Version 18.10 has just been released - tapped horns can now have a throat chamber. The TH schematic diagram has been modified to show the throat chamber, and the two sides of the driver diaphragm are now more clearly displayed.

Kind regards,

David

David McBean 31st March 2008 08:14 AM

Hi Everyone,

Hornresp Version 18.20 has just been released - tapped horns can now have two segments between the driver entry points if required. See Note 7 on page 15 of the Help file for details.

Kind regards,

David

iand 31st March 2008 11:34 AM

Quote:

Originally posted by David McBean
Hi Everyone,

Hornresp Version 18.20 has just been released - tapped horns can now have two segments between the driver entry points if required. See Note 7 on page 15 of the Help file for details.

Kind regards,

David

Hi David

Excellent news, it's often possible to get better response with a slow flare section followed by a faster one between the tap points -- see Tom's patent, first in the list at http://tinyurl.com/2xkxav

Is there a reason the tapped horn wizard doesn't work with 4 sections? It doesn't change the horn shape, only slides the tap points along the predefined shape, so I don't see the reason.

Cheers

Ian

tb46 1st April 2008 04:05 AM

Another very useful and fun addition to a great program.
Thanks David.:)

David McBean 1st April 2008 08:36 AM

Quote:

Originally posted by iand
Is there a reason the tapped horn wizard doesn't work with 4 sections? It doesn't change the horn shape, only slides the tap points along the predefined shape, so I don't see the reason.
Hi Ian,

In a four-segment horn the tap points are defined by the values of L12 and L45. Shifting the tap points in a horn having a fixed overall length will alter the lengths of segments 1 and 4, and therefore the overall profile of the horn.

In a three-segment horn the tap points are defined by the values of L12 and L34. The Wizard automatically re-sets the profile to that of a single flare using the expansion rate of the middle segment (either Con or Exp) with the throat area being S1, the mouth area being S4 and the overall length being L12 + L23 + L34.

If this is done with a four-segment horn, it defeats the purpose of initially specifying two different-profile segments between the tap points.

The way that the input screen and simulation model are structured, the tap points cannot be defined independently - they need to be specified using segment length values.

Hope this makes sense :-).

Kind regards,

David


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