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Old 2nd May 2013, 06:18 AM   #3451
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Quote:
Originally Posted by AndrewT View Post
Could the units of measurement be added to the input screens?
Hi Andrew,

This has been requested previously :-). The change has not been implemented because I want the input forms to remain as uncluttered as possible.

As far as the main input parameters window is concerned, moving the mouse pointer over an input box shows the units in the status bar panel at the bottom of the window.

Units are included on the Filter Wizard and Driver Front Volume tool sliders simply because this information is not given elsewhere.

Kind regards,

David
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Old 4th May 2013, 12:06 PM   #3452
Mark Kravchenko --- www.kravchenko-audio.com
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You don't fix what ain't broke!
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Old 7th May 2013, 02:21 PM   #3453
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The max spl view is a bit confusing, as the drive voltage changes as the impedance changes. You can of course get information you want by F3 sample, but if the graph cursor updated drive voltage, watts, attempted excursion, pascals at throat and throat velocity it might be handy.

I've been using spl graph set and a nominal 1w for years and I just realized that the max spl graph was variable in drive voltage. I know, foolish me, right?
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Old 8th May 2013, 03:58 AM   #3454
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Quote:
Originally Posted by hellonwheels View Post
The max spl view is a bit confusing, as the drive voltage changes as the impedance changes. You can of course get information you want by F3 sample, but if the graph cursor updated drive voltage, watts, attempted excursion, pascals at throat and throat velocity it might be handy.
Hi hellonwheels,

The Hornresp Maximum SPL chart shows the SPL 'performance envelope' when limited by either Pmax driver input power or Xmax diaphragm displacement.

For the black-trace section of the chart, "watts" is constant at the Pmax value.
For the red-trace section of the chart, "attempted excursion" is constant at the Xmax value.

From the Maximum SPL chart:

* Select the Sound Pressure chart to see "pascals at throat".
* Select the Particle Velocity chart to see "throat velocity".

* Select the Diaphragm Displacement chart to see "attempted excursion".

Then from the Diaphragm Displacement chart:

* Select the Pressure chart to see "pascals at diaphragm".
* Select the Velocity chart to see "diaphragm velocity".

I would prefer not to add more data to the Maximum SPL chart cursor sampling output. The chart shows the maximum SPL, which is the sample result given.

Kind regards,

David
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Old 8th May 2013, 06:44 PM   #3455
rrr969 is offline rrr969  Ukraine
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Hi! And thank you.

If flare mouth is on the rear of the cabinet like here Bigger Frugel horn (Bugelhorn?)
How should we measure "path length difference" for combined SPL response? The shortest distance between mouth/cone centres around side panel or a little more due to floor/wall elongation?
Maybe rear mouth in full-range driver (OD setup) is preferable because we can make longer 1st segment (makes nice direct radiation), big front baffle (it makes "bigger" sound IMO), we don't hear higher harmonics from flare. Am I right or front mouth horns are more gainy, sim predictable and room indifferent that they are
comme il faut?
Have I to implement S1, S2, S3 area correction (multiply to say 1.1) due to rectangular cross-section (not circular as simulated)? We really appreciate your work. Best wishes.
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Last edited by rrr969; 8th May 2013 at 07:05 PM.
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Old 9th May 2013, 05:47 AM   #3456
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Hi rrr969,

Quote:
Originally Posted by rrr969 View Post
How should we measure "path length difference" for combined SPL response?
To keep things simple, I would probably just use the following:

Path length difference = -(cabinet rear width / 2 + cabinet side depth)

For example, if the loudspeaker cabinet is rectangular, and 30 cm wide by 48 cm deep, then the path length difference would be -(30 / 2 + 48) = -63 cm (by definition, the value is negative because the distance from the rear-facing horn mouth to the listener is greater than the distance from the front-facing direct radiator diaphragm to the listener).

Quote:
Originally Posted by rrr969 View Post
Maybe rear mouth in full-range driver (OD setup) is preferable because we can make longer 1st segment (makes nice direct radiation), big front baffle (it makes "bigger" sound IMO), we don't hear higher harmonics from flare. Am I right or front mouth horns are more gainy, sim predictable and room indifferent that they are comme il faut?
If the loudspeaker is positioned close to a wall or in a corner, then a rear-facing horn should theoretically have better acoustical loading at the mouth, and therefore a stronger and a slightly smoother response. It really all depends on your overall system design aims as to whether you use a front-facing or rear-facing horn. Others having practical experience with such systems may wish to comment further.

Quote:
Originally Posted by rrr969 View Post
Have I to implement S1, S2, S3 area correction (multiply to say 1.1) due to rectangular cross-section (not circular as simulated)?
It is not necessary to adjust the S1, S2, and S3 values. The cross-sectional area is the important parameter, not whether the shape of the actual constructed section is circular or rectangular.

Kind regards,

David
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Last edited by David McBean; 9th May 2013 at 05:51 AM.
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Old 10th May 2013, 05:47 PM   #3457
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Hi, when I open HR it prompts me to download the latest version-the link takes me to a spurious site: hornresp any suggestions?

Doh-just noticed your link in sig...

Now it won't create the file?

Last edited by TheBaronGroog; 10th May 2013 at 05:49 PM.
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Old 10th May 2013, 05:51 PM   #3458
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stating the obvious: there is a new version out but don't go there to get it.
Instead, download from
Hornresp
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Old 11th May 2013, 07:35 AM   #3459
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Default Hornresp Update 3220-130511

Hi Everyone,

The Filter Wizard tool can now calculate the overall group delay of a passive filter and loudspeaker combination.

My thanks to Jean-Michel for his comment in Post #3406 which prompted me to develop a method to determine group delay values in real time.

Kind regards,

David
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Old 11th May 2013, 07:42 AM   #3460
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Hm, very nice Thank you!
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