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Old 11th November 2011, 08:48 AM   #2441
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Quote:
Originally Posted by littlemike View Post
If the file to be imported is placed in the Import directory while Hornresp is running, it may not be visible. Simplest solution is to just restart Hornresp.

Check that - I'm seeing mixed behavior on this - my Windows 7 machine does not mind at all, yet I seem to recall experiencing this with Windows XP. Perhaps a recent update remedied this?
Hi littlemike,

The file to be imported can be placed in the Import directory while Hornresp is running. If the Import Hornresp Record tool has already been opened, the file will not be shown in the list. In that case, simply close the tool and re-open to display the file name.

Imported file records are added to the end of the main Hornresp data file.

There has been no recent update to change the import functionality.

Kind regards,

David
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Old 11th November 2011, 08:51 AM   #2442
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Quote:
Originally Posted by NEO Dan View Post
Although Hornresp will generate .aks export files for use with Akabak it will not import them.
Exactly :-).

Kind regards,

David
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Old 11th November 2011, 11:02 PM   #2443
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David,
I have a little hornresp design at MCM 8" 55-2421 Isobaric post #60

Any insight would be much appreciated as I have just started playing with Hornresp.

Thanks,
rev.
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Old 11th November 2011, 11:35 PM   #2444
Zero D is offline Zero D  United Kingdom
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Question Strange Results ?

@ David McBean

Hi, Re this thread My First TH design & tb46's TH design he kindly did for me fane_001.txt

I'm hoping you can shed some light on my trying to establish why i "appear" to see conflicting etc data !

For the 1500W tests i set the Input Parameter - Eg = 109 Volts

For the 100W tests i set the Input Parameter - Eg = 28.28 Volts

For some reason Eg isn't available on the slider ?

My main concern though is, why the design "seems" to be Extemely displacement limited. Considering this a 1500W driver with Xmax of 12.75mm !

TIA
Attached Images
File Type: gif Disp - 100W.gif (17.8 KB, 274 views)
File Type: gif Resp 100w.gif (18.0 KB, 263 views)
File Type: gif Pmax-Xmax.gif (17.9 KB, 256 views)
File Type: gif Resp.gif (19.0 KB, 253 views)
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Old 12th November 2011, 06:36 AM   #2445
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Quote:
Originally Posted by revboden View Post
David,
I have a little hornresp design at MCM 8" 55-2421 Isobaric post #60

Any insight would be much appreciated as I have just started playing with Hornresp.

Thanks,
rev.
Hi rev,

You are on the right track as far as specifying a tapped horn design in Hornresp is concerned. Because the results shown appear to have been generated by input parameters different to those given, it is difficult for me to comment further.

My practical speaker-building experience is relatively limited, so I am probably not the best person to be commenting on your design anyway :-).

Kind regards,

David
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Old 12th November 2011, 07:33 AM   #2446
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Hi Zero D,

Quote:
I'm hoping you can shed some light on my trying to establish why i "appear" to see conflicting etc data !
For the 100W tests i set the Input Parameter - Eg = 28.28 Volts
Setting Eg to 28.28 volts means that the power delivered to a pure 8 ohm resistive load will be 100 watts. Because the impedance of a nominal 8 ohm loudspeaker varies considerably across its operating frequency range, the actual input power will vary from the nominal 100 watt value, as the frequency changes.

Quote:
For some reason Eg isn't available on the slider ?
When the Pmax slider is set to 100 watts the input power is maintained at a constant value across the frequency range, independent of changes in speaker impedance. This means that the value of Eg actually changes to keep the power constant. In this case only the input power is of interest, so the Eg slider is automatically disabled when the Pmax slider is activated.

To summarise the above, in the first case a constant voltage source of 28.28 volts is used, whereas in the second case a constant power source of 100 watts is used. This is why the results are different.

Quote:
My main concern though is, why the design "seems" to be Extemely displacement limited. Considering this a 1500W driver with Xmax of 12.75mm !
Hornresp assumes linear behaviour at all input voltage levels. No allowance is made for low frequency high power amplitude compression, which may be the actual case in practice.

Kind regards,

David
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Last edited by David McBean; 12th November 2011 at 07:35 AM.
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Old 12th November 2011, 12:05 PM   #2447
Kolbrek is offline Kolbrek  Norway
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Quote:
Originally Posted by Zero D View Post
Considering this a 1500W driver with Xmax of 12.75mm !
But that doesn't mean that you can get both at the same time everywhere. At some frequencies you will hit Xmax at low power, at other frequencies you will not get anywhere near Xmax with 1500W input.

Regards,
Bjørn
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Old 12th November 2011, 01:56 PM   #2448
Mark Kravchenko
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Regarding maximum output.

Take a simple look at the drivers resonant peak impedance. Usually 10 to 12 times it's rated impedance. Your amp will be putting 10 to 12 times less power into your driver in this area of it's use. Amplifiers are designed to behave as a voltage source. But they run into problems when the current across the impedance is greater than they can provide.

Always be careful what you trust in terms of speaker marketing! Much smoke and oh so many mirrors.
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Old 13th November 2011, 12:00 AM   #2449
Zero D is offline Zero D  United Kingdom
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@ David McBean

Thanks for the concise explanations, it's a lot clearer now & i now understand why i was seeing "seemingly" conflicting data. So all is well there

@ Kolbrek

Thanks i realise that though. My concern was wondering why i was seeing such poor results.

@ mwmkravchenko

Indeed, good points
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Old 13th November 2011, 07:36 AM   #2450
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Default Hornresp Update

Hi Everyone,

The maximum permissible S2 value for a Le Cléac'h horn has been increased to 999999.9 sq cm. This means that a fully-formed 180 degree horn with a cutoff frequency down to 18 hertz can now be simulated (see attached screenprints). Even lower cutoff frequencies can be accommodated if the mouth angle is allowed to be less than 180 degrees - which is probably going to be the case regardless, given that a fully-formed 18Hz horn has a maximum diameter of 10.69 metres :-).

While it is still only possible to simulate horns with a maximum mouth angle of 180 degrees, extending the foldback of a practical horn beyond that limit is unlikely to make any audible difference to the radiated sound anyway. Construction data for a 360 degree axisymmetric Le Cléac'h horn can however be obtained if necessary by exporting the "exact profile" from the schematic diagram window.

My thanks to witasso for prompting the initial discussion on this matter, and to Jean-Michel and Mark for helping me to clarify my thinking, particularly in relation to Le Cléac'h horns.

The latest Hornresp release is Version 28.80.

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

Kind regards,

David
Attached Images
File Type: png Input.png (21.8 KB, 239 views)
File Type: png Schematic.png (16.3 KB, 124 views)
File Type: png Response.png (23.6 KB, 121 views)
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