Hornresp
 

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

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

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

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

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.

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

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

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

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

Thanks Oliver :-)

Kind regards,

David

Hi Ian,

After posting my last message I thought some more about how the tapped horn wizard could be made to work with a four segment system, and have already started work on implementing the necessary changes :-).

The four segment input form will be as shown in the attached screenprint. Note that only those parameter values that are changed by the operation of the wizard are now displayed (S1, S3 and S5 values are not shown).

I will let everyone know once Hornresp Version 18.30 is released. It may take me a week or so to arrange, as I am a bit short on time at the moment.

Kind regards,

David

David Please quickly. i'm waiting for as the same.


Thanks.... Thanks...Thanks:)

David, you deserve a medal :-)

Cheers

Ian

Hi Thawach and Ian,

Just letting you know that Hornresp Version 18.30 has been released. The tapped horn wizard now works with both three and four segment systems.

Kind regards,

David

McBean u are good...good...good...good...and good and good=very good. i'm waiting for...waiting for...waiting for.....=a long time


O..O..che i love u rarely.


Thanks

:D

That was a *very* short week... :-)

Thanks for all the work, it's rare indeed to get such a rapid response (or sometimes, any response) to requests for software enhancements.

Ian

Invalid result error.
 

Hi David,

After installing V18.30 I got an

"Invalid result. Change input data." error

on all tapped horn simulations.
I'm attaching an input parameter sheet for you to see. Maybe you can help. V18.20 works just great.
If you would be so kind as to take a look at this and let me know what I'm missing, I would appreciate it.

Thanks again for all the fine work, Regards

Same here. "normal" horns seem to work fine, though. Switching to the tapped horn wizard shows calculated results.
Adding a 4th segment seems to get it working again.

One other thing I just encountered:

When using the max-SPL feature, a given limitation due to excursion is labeled as "power limited". It´s late already, am I thinking right, shouldn´t it be "xmax limited"?
http://img143.imageshack.us/img143/4...8013112fd1.png

I missed 18.20, does anybody have a copy?

David, once again. Thank you!!!

It says "given no xmax limit". How can it be xmax limited?

I just had the same problem with the tapped horn feature. Just make it 4 segments instead of 3 and it works again. I like the slide feature. It took me a few tries to get agile, but then it speeded up the process of alignment tremendously.

David, you are updating at an alarming rate! :D

What more can we expect? I would be interested in a tapped horn alignment wizard (enter length and driver and the wizard sorts out optimal driver position, that sort of thing). But, to be honest, I'm getting pretty good results without it. :)

Invalid result error.
 

Thanks Ivo, that work around works.
:)

Hi everyone who like the same...same.


David tell me that now he is working hard for a new version. he can not answer everyone because he is busy because me. i think the next version will coming soon. the name may be change that the Hornresp thawach Version. David are u o..che?lol:D :D :smash:

No rush, plenty to do myself... :(

Ivo! don't too old . still young....still young will be happy.:whazzat:

It was late, I should have elaboratet more :)

Excursion of a 2x15" TH looks like this:

http://img145.imageshack.us/img145/6...8105535hk1.png

So at 60Hz there is a max.

Now using max-SPL feature with 1,8kW and 9,6mm xmax gives:

http://img237.imageshack.us/img237/5...8110035tb0.png

As far as I understand it, the xmax-feature gives a response curve depending on whether xmax or max power is reached. Input Power here was 1800 Watt, xmax was defindes as 9,6mm.
So if theoratical excursion would be 27mm when driven with 1800 watts, its more than xmax. Therefore xmax should be the limiting factor at 60 Hz. hornresp claims "power limited" though.

Looking at a simulation of a closed design with a different speaker (18") looks like this:
http://img339.imageshack.us/img339/7...8110517eu3.png
with xmax at 9,8mm and 1250 Watts. The Limitation in the low end is obvious.

Here the sample-feature gives a correct "excursion limited"
http://img211.imageshack.us/img211/7...8110630kb2.png

Re: Invalid result error.
 

FWIW I'm not having this problem, it works with all the old three segment TPs, THs I tried, as well as a couple of new four segment ones, but it doesn't always import the correct 'S2' data in both three or four segment ones, instead some value between 'S1' and 'S2', so of course the response plot is all wrong.

GM

Well, I downloaded it again and re-installed it to see if it would cure my problem, but now I can't view any of my previous three segment TPs, THs, without first adding a 4th section, plus none of the wizard's fields are working right. :(

GM

Hi Ian,

I should have spent more time on pre-release testing - two obvious errors slipped through :-). The problems have now been rectified. A subtle bug that I discovered recently in the Wavefront Simulator has also been fixed.

Kind regards,

David

Re: Invalid result error.
 

Hi Oliver,

You are not missing anything :-).

Thanks for bringing the error to my attention - it has now been fixed.

Product Number 1830-080408 refers.

Kind regards,

David

Hi Sabbelbacke,

Your thinking is exactly right :-).

Thanks for bringing the error to my attention - it has now been fixed.

Product Number 1830-080408 refers.

Kind regards,

David

Hi Ivo,

I suspect that it could be very difficult to develop an automated tapped horn alignment wizard along the lines that you have suggested. The latest "scroll bar" version is probably the best that I can come up with :-).

I am currently working on developing an offset driver model. Because of the magnitude of the changes required to Hornresp, it will be released as Version 19.00.

Kind regards,

David

Thanx again David!!! I just tried it, old data works again and "excursion limited" is back, too :)

Just noticed one minor thing, which might be "on purpose" after all:

If I use the "tapped horn slider wizard", leave the dialog via "save" button and don´t calculate again, there is no safety "save data" pop up like usual. Leaving the current design via "next/previous" or quitting hornresp results in loss of the new values from the wizard.

Best regards :)

Error fixed.
 

Hi David,

Thanks for the quick follow up. I second Sabbelbacke's remark on the "save data" issue. Otherwise everything seems to work just fine.

Wish I could say the same about my old simulations, as old fumble fingers managed to loose two month worth of playing. Note to self: moving a file is not the same as copying a file.

Oh well, thanks again, Regards:)

It's great already, I was just pushing it a little, since you are open to such things.

Did I spark that after all? ;)

Hi Sabbelbacke,

It is definitely not on purpose :-).

Thanks again for the great feedback, the error has now been fixed - Product Number 1830-080411 refers.

This will teach me not to work on the program when I should really be sleeping :-).

Kind regards,

David

Hi Ivo,

You certainly did :-).

Kind regards,

David

Re: Error fixed.
 

Thanks Oliver.


Your comment has reminded me of something - my next posting refers :-).

Kind regards,

David

USER NOTE - CORRUPTED HORNRESP.DAT FILES
 

Hi Everyone,

A few users have reported problems with corrupted Hornresp.dat data files. When investigated, the corruption is invariably found to be due to switching back to an earlier version of Hornresp after having opened the data file with a more recent version of the program.

Please note that the program automatically updates an existing data file as necessary with each new release. Once a data file has been opened using a particular version of Hornresp, under no circumstances should that file then again be used with an earlier version of the program. The safest course of action is to delete any earlier version of the program that you may be using, each time you download a new release.

An earlier version of the program has no way of knowing how to interpret a data file that has been modified by a later release of Hornresp.

Kind regards,

David

Hy David.

Thanx for the helpfull reminder and the quick fixup :)

Hi Sabbelbacke,

No problem :-). If you find any more bugs, please let me know.

Kind regards,

David

Hi David,
First, thanks for a great tool!

Question...
With a conical or OS, I am seeing directivity dramatically narrow just above LF cutoff. Is this because there is no baffle or mouth treatment? If not, what does cause it?
Thanks,
Paul

That seems to be characteristical for conical horns. I remember Tom Danley posting about this, but not where, maybe the audio asylum. In the unity and synergy horns this is countered with a short horn segment at the end of the horn which has a slightly wider angle than most of the horn. But it seems that hornresp cant simulate the radiation pattern for multi segment horns, so i cannot check if this is true.

Hi Paul,

It gets a bit complicated, but essentially the effect is due to the shape and size of the wavefronts in a conical horn relative to wavelength. Note that the directivity narrowing actually occurs in practice - it is not just in the simulation results that you will see it.

Kind regards,

David

Hornresp Version 19.00
 

Hi Everyone,

Hornresp Version 19.00 has just been released. Changes are:

1. Offset driver horns can be modelled. See Note 7 on page 15 of the Help file for details.

2. The tapped horn option is selected differently. See Note 8 on page 15 of the Help file for details.

3. The Multiple Drivers tool is now the Driver Arrangement tool. The number and position of drivers can be specified.

4. The profile information for the left and right side walls of a rectangular cross-section horn is now also exported, where the data can be directly calculated. See Note 14 on page 17 of the Help file for details.

5. A bug in the Tapped Horn Wizard which “froze” the program under some circumstances, has been fixed.

Kind regards,

David

Thank you David. Us hornies owe you a large debt of gratitude.

Yay for the offset driver option! Building my unity/synergy horn would have been alot easier this way. But now i can use it in my first revision :) Thanks!

Once again: THANK YOU!!!!

David,
Would you say a bit more about this? I'd like to understand the root cause a little better.
Thanks,
Paul

I only started using this program last week, and it's excellent.

I just want to say thanks and keep up the good work. :)