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Old 14th January 2020, 03:16 PM   #10381
BP1Fanatic is offline BP1Fanatic  United States
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Quote:
Originally Posted by David McBean View Post
In the case of a tapped horn a throat chamber port can be specified, but it is not a fifth segment.
I knew that option. Thank you anyways David! HR is still the best software EVER!
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Old 14th January 2020, 07:32 PM   #10382
mwmkravchenko is offline mwmkravchenko  Canada
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Hornresp
Quote:
Originally Posted by David McBean View Post
In the case of a tapped horn a throat chamber port can be specified, but it is not a fifth segment.

That's all I can come up with to.


It's something. But not a real segment.



You just need a really big throat chamber!
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Old 15th January 2020, 06:42 AM   #10383
David McBean is offline David McBean  Australia
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Default Hornresp Update 5050-200115

Hi Everyone,

CHANGE

The resonance frequency issue reported by Giri in Post #10353 and followed up in Post #10370, has now been fixed.

Note that while "false positives" triggering erroneous frequencies can no longer occur, it is still possible in some circumstances for the resonance frequency to "jump" when a slight alteration is made to an input parameter value. This now only happens at the critical crossover point where the loudspeaker system transitions from exhibiting the characteristics of a parallel resonant circuit (high impedance at resonance) to one exhibiting the characteristics of a series resonant circuit (low impedance at resonance). This step-change is to be expected, and is not caused by a bug.

To illustrate the behaviour, the attachments show how the resonance characteristics transition for a given test example as L12 is increased from 27.00 (parallel) to 98.00 (series), with the crossover or "jump" occurring at the point where L12 changes from 74.70 to 74.80.

My thanks to Giri for reporting the resonance frequency issue.

Kind regards,

David
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Old 15th January 2020, 07:08 AM   #10384
Mazza is offline Mazza  Australia
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David it goes without saying you are an immensely generous chap with what you are doing here for us all.


For me the added benefit is the generous sharing of knowledge - case example "This step-change is to be expected" - I had no idea this would be expected so I learnt something then.


Thank you!
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Old 15th January 2020, 08:08 AM   #10385
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by Mazza View Post
"This step-change is to be expected" - I had no idea this would be expected so I learnt something then.
Hi Mazza,

Just to clarify - the step-change is to be expected only in the context of how Hornresp determines the theoretical resonant frequency. Your guess is as good as mine as to what actually happens to the system resonance during such an impedance transition, in a real loudspeaker :-).

Kind regards,

David
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Old 15th January 2020, 07:32 PM   #10386
Bambinz is offline Bambinz  Switzerland
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Hi David,
A questions, up to which frequency the simulation is correct?
I'am simulating a full-range MLTL with the Dayton RS100-8 and I obtain this results:
Click the image to open in full size.

The valley in the region of 600Hz that is present in the simulation, will be present also in the real speaker? Because in the real TL will be not straight.
Thank you very much!

Last edited by Bambinz; 15th January 2020 at 07:36 PM.
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Old 16th January 2020, 07:24 AM   #10387
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by Bambinz View Post
The valley in the region of 600Hz that is present in the simulation, will be present also in the real speaker?
Hi Bambinz,

It is difficult to say, not knowing what is causing the dip in the predicted response in the first place. The Hornresp simulation model assumes that the transmission line is a straight axisymmetric duct, and that the driver is a rigid plane piston. Any deviation from these assumptions in the actual built loudspeaker will mean that there will be a difference between the measured results and the predictions. How much of a difference there will be in the case of your system, I don't really know.

You question could perhaps be best answered by someone who has already built a system similar to the one you propose.

Kind regards,

David
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