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Old 29th May 2011, 07:13 PM   #1951
djn is offline djn  United States
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Gotch' ya. Thanks GM.
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Old 2nd June 2011, 08:05 PM   #1952
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Hey,

Someone asked about radial horns in Hornresp a while ago.

Made this simple spreadsheet. You have to do the design in Hornresp and from there import the length and area data to column B&C. You also have to choose your angle(G2). To make it work you also have to start the radial portion of the horn at the point where the height equals the straight-cut width. After that, back to the throat, a square to round adapter must be made. The example is for a full, 2", 180Hz Tractrix horn.

http://www.revintage.se/paul.xls

Last edited by revintage; 2nd June 2011 at 08:19 PM.
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Old 8th June 2011, 07:17 AM   #1953
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Hello David,
When exporting I want smaller increments than seems possible. Is it any way to get past this? I want 0,5cm for a 190Hz Spherical but the smallest possible is 0,66cm.
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Old 9th June 2011, 07:33 AM   #1954
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Quote:
Originally Posted by revintage View Post
When exporting I want smaller increments than seems possible. Is it any way to get past this?
Hi Lars,

The reason for the increment minimum was to limit to approximately 100 the maximum number of elements that could be specified for any horn segment. This constraint has now been relaxed so that the maximum allowable number of elements for any segment becomes approximately 1000. This should fix your problem :-).

The new Hornresp release is Product Number 2840-110609.

Thanks for bringing this issue to my attention.

Kind regards,

David
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Old 9th June 2011, 07:36 PM   #1955
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Hello, I tried modelling a Dynaudio D54 driver in a Edgar 500 Hz tractrix horn and I got a very nonlinear response. I read the Speakerbuilder article by him about midrange horns, and where he talks about how drivers become suspension dominated above a certain frequency, I began to wonder if Hornresp takes this into consideration. Does this program give accurate results when the mass roll off frequency calculation no longer applies. I admit I dont know much about how midrange drivers function.
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Old 9th June 2011, 08:36 PM   #1956
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Originally Posted by djn View Post
Here is the Polar Map for the short Altec horn. I never really looked at Polar Maps so I took some time this morning to figure it out. So, is this map saying that if I am on the 0 axis, the responce will be strongest from 150hz to 450hz? Then 3db down from that from 100hz to 600hz? I want to use these horns from 100hz to 500hz or so and they will be pointing right at me in my listening chair. So these look like a good fit....right?
If you get a newer version of hornresp, there will be an option to normalize the polar plot. That will let you look at just the pattern. It's what the pattern would be if you eq'd the response flat (which is what it should be in the frequency range that you're using the horn in). This makes it easier to match up to other speakers.
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Old 10th June 2011, 06:03 AM   #1957
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Originally Posted by dirkwright View Post
I tried modelling a Dynaudio D54 driver in a Edgar 500 Hz tractrix horn and I got a very nonlinear response. I read the Speakerbuilder article by him about midrange horns, and where he talks about how drivers become suspension dominated above a certain frequency, I began to wonder if Hornresp takes this into consideration. Does this program give accurate results when the mass roll off frequency calculation no longer applies. I admit I dont know much about how midrange drivers function.
Hi dirkwright,

Suspension compliance and resistance are taken into account by the Hornresp model.

The driver diaphragm is assumed to be a rigid plane piston - a Dynaudio D54 driver has a soft dome diaphragm.

The default SPL response shows the power response - the Directivity tool can be used to obtain the pressure response.

Kind regards,

David
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Last edited by David McBean; 10th June 2011 at 06:24 AM.
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Old 10th June 2011, 07:29 AM   #1958
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Quote:
Originally Posted by David McBean View Post
Hi dirkwright,

Suspension compliance and resistance are taken into account by the Hornresp model.

The driver diaphragm is assumed to be a rigid plane piston - a Dynaudio D54 driver has a soft dome diaphragm.

The default SPL response shows the power response - the Directivity tool can be used to obtain the pressure response.

Kind regards,

David
So, I guess it's not really possible to model this particular driver? I also don't have some of the data on the driver. I guess the best I can do is get TrueRTA to measure the response. Thanks.
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Old 11th June 2011, 07:55 AM   #1959
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Originally Posted by dirkwright View Post
So, I guess it's not really possible to model this particular driver?
Hi dirkwright,

Not accurately - at least not in Hornresp :-).

Kind regards,

David
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Old 12th June 2011, 09:42 AM   #1960
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Hey Dirkwright,
All data needed for simulations in Hornresp is in the original datasheet. Did some simulations with different hornmodels and they looked acceptable/useful. I also tried some compression and it looked even better.

How the driver/horn behaves at higher frequencies is already known so concenterate on the behaviour at lower frequencies. If you want the horn to be useful from 500Hz you should go for something like 300-3500Hz Fc.

Do you really think the sensitivity is good enough?
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