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Old 13th January 2013, 03:41 PM   #3091
Mark Kravchenko
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Default A little Show and tell overture

I do quite a bit of design work for different clients. From time to time we do take the designs to prototype and then production. I like to share the following screens. It is simulating and measurement of a very interesting variant on a mass loaded transmission line. No large labyrinth required, just a variant on the venting.

Sim.png

Meas2.png

Magnitude of the impedance are not always the same. But they are in remarkably similar locations. Desired tuning frequency at the zero crossing point is spot on. Not bad for a program designed to simulate horns being used to simulate a whacky type of port!

It shows to me that the fundamental theory behind Hornresp is spot on. I describes what air is doing under the influence of a driver. Almost universal in it attribution to speaker design.

What did i do before Hornresp?

Lots of calculating!

And many more mistakes.
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Old 14th January 2013, 04:56 AM   #3092
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Quote:
Originally Posted by maxmercy View Post
I wish to echo that sentiment. Hornresp is a wonderful tool and gives me nearly WYSIWYG results when designing front loaded bass horns.
Thanks maxmercy :-).

Kind regards,

David
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Old 14th January 2013, 05:02 AM   #3093
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Quote:
Originally Posted by mwmkravchenko View Post
It is simulating and measurement of a very interesting variant on a mass loaded transmission line.
Hi Mark,

Thanks for sharing. It is always nice when the measured results line up reasonably well with the predictions :-).

Kind regards,

David
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Old 14th January 2013, 10:18 AM   #3094
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Yes. Hornresp is scary accurate considering the numerous variables that we don't simulate.

Here is a TH I made with the lovely B&C 15PE40 measured at the opening.
Click the image to open in full size.
*edit* grey trace is with added resistance to show it behaving differently than creating the hump.

Not entirely sure why there is a hump in the response as it's spot on below the passband meaning it's not room gain. Not a bad one though.
I have not made any far field measurement yet so I can not separate it from the room.

According to AkAbak it gives gain in the entire passband by over 2 when comparing excursion of the driver vs opening. Something a BR can't do.

Last edited by David_Web; 14th January 2013 at 10:20 AM.
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Old 14th January 2013, 05:38 PM   #3095
more10 is online now more10  Sweden
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I also want to thank you David for this wonderful tool. I use it whenever I can for my projects. Simulations are very accurate!

My friend Asto found out that you can use Hornresp for Helmholz calculations (and visualisation), this is how to do it:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I would like to add Helmholz Q calculation to the wishlist.
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Old 14th January 2013, 09:07 PM   #3096
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The Helmholtz trick is brilliant!

Also I think I found a possible reason for the hump seen in my last post.
IIRC the amp I used to measure had a coupling cap as it was SE chipamp.
Adding a cap in AkAbak did get a rising response similar to the green trace. That + maybe some room interaction could be the key to the mystery.
You have to have a pretty large cap for the change vs bare wire to be insignificant.
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Old 15th January 2013, 06:59 AM   #3097
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Quote:
Originally Posted by David_Web View Post
Here is a TH I made with the lovely B&C 15PE40 measured at the opening.
Hi David_Web,

Thanks for the feedback.

The measured versus predicted comparison looks good - particularly after seeing the explanation for the hump in your follow-up post :-).

Kind regards,

David
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Old 15th January 2013, 07:21 AM   #3098
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Quote:
Originally Posted by more10 View Post
My friend Asto found out that you can use Hornresp for Helmholz calculations (and visualisation), this is how to do it:]

I would like to add Helmholz Q calculation to the wishlist.
Hi more10,

Thanks for detailing this process.

The port output can of course be shown on the main SPL response chart if so desired - it is not essential to use the Loudspeaker Wizard tool.

I have no plans to provide specific quality factor information in Hornresp. A good indication of the port Q can be gained from your chart, however.

Kind regards,

David
Attached Images
File Type: png Port.png (29.6 KB, 120 views)
File Type: png Output2.png (64.5 KB, 42 views)
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Old 20th January 2013, 08:11 AM   #3099
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Default Hornresp Update 3100-130120

Hi Everyone,

Hornresp can now model radius horns. See Horn flare for background information. To select Rad flare in edit mode, press R when the L12 length parameter has the focus. Three sample profiles are attached.

Could you please let me know if you find any bugs.

Kind regards,

David
Attached Images
File Type: png Radius1.png (46.4 KB, 48 views)
File Type: png Radius2.png (46.2 KB, 41 views)
File Type: png Radius3.png (45.2 KB, 36 views)
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Old 20th January 2013, 11:22 AM   #3100
more10 is online now more10  Sweden
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Click the image to open in full size.

When hitting

Click the image to open in full size.

As you can see, the L12 field is not editable:

Click the image to open in full size.
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