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Old 19th August 2011, 05:19 AM   #2161
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Quote:
Originally Posted by David McBean View Post
Select the Tools > Directivity > Response... menu command to show the pressure response.

Note that the tool only applies to finite single-segment non-negative flare horns.
I kwow the single segment trick, but is there a reason that it is impossible to use with multiple segments or reflex design ? Too complicate to be programmed? thank.
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Old 19th August 2011, 06:15 AM   #2162
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Quote:
Originally Posted by ted4412wilt View Post
the download site still says 110816 but the download works with 110818
Hi Ted,

I suspect that your Internet Browser settings are such that they do not automatically check for newer versions of stored pages each time a site is visited.

The Hornresp download site Product Number was / is definitely correct - I can guarantee it :-).

Kind regards,

David
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Old 19th August 2011, 06:18 AM   #2163
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Quote:
Originally Posted by tb46 View Post
The new version downloaded and updated fine with the correct number.
Excellent :-).

Thanks Oliver, for the confirmation.

Kind regards,

David
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Old 19th August 2011, 06:48 AM   #2164
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Quote:
Originally Posted by julienb34 View Post
I kwow the single segment trick, but is there a reason that it is impossible to use with multiple segments or reflex design ? Too complicate to be programmed? thank.
Hi julienb34,

To accurately simulate the directivity of a multiple segment horn or the combined response of a bass reflex loudspeaker would require a completely different model to that currently used in Hornresp. Boundary Element Method (BEM) techniques could be used, but the downside would be the very long calculation times. For that reason, I have no plans to change the Hornresp directivity model - even though I have done some experiments calculating directivity using BEM techniques (see attached example).

Kind regards,

David
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File Type: png Pattern.png (28.9 KB, 188 views)
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Old 20th August 2011, 02:20 PM   #2165
vadi is offline vadi  Austria
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Hi, thank you for the updates to Hornresp.

I'd like to suggest a parameter for listening distance affecting SPL levels.

As a beginner I also found the maximum SPL Watt entry a bit confusing. I wondered if it was combined Watts or individual?
For example I could use two individual amplifiers for two drivers or one amp with the drivers connected in parallel for one box (as is suggested currently by Hornresp I think)?
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Old 20th August 2011, 05:13 PM   #2166
NEO Dan is offline NEO Dan  United States
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Hi David,
Thanks for the new features!!!

@vadi

Not to be mean but it's hard enough to understand what is being posted, I for one could do without distance. I am invisioning Noobies posting .25m .25pi charts. For clarity I'd like to see the voltage and radiation angle(1pi,2pi) imprinted in the header or footer of the graphs. Besides distance is already used for pathlength difference in parts of Hornresp.

Drivers powered by individual amps and parallel connection = same output for same input voltage.
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Old 20th August 2011, 05:58 PM   #2167
vadi is offline vadi  Austria
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Thank you for the clarification, I just thought about some help text for the amplifier per with multiple speakers.
The distance could be in the header too in the graph.
These were just minor things that came to my mind.
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Old 21st August 2011, 06:39 AM   #2168
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Hi vadi,

Quote:
Originally Posted by vadi View Post
I'd like to suggest a parameter for listening distance affecting SPL levels.
The generally accepted standard normalised reference distance is 1 metre. Allowing this to be changed by the Hornresp user might lead to confusion when different loudspeaker systems are being compared. All things considered, I think it is probably safer to leave SPL results as they are - normalised to 1 metre :-).

If you wish, the SPL at distance D metres given the SPL at 1 metre, can be calculated as follows:

SPL(D) = SPL(1) - 20 * Log10(D)

For example - if the SPL at 1 metre is 100 dB, then the SPL at 10 metres will be:

SPL(10) = 100 - 20 * Log10(10)
SPL(10) = 100 - 20 * 1
SPL(10) = 80 dB

Because of the inverse square relationship, SPL falls off at the rate of approximately 6 dB for each doubling of distance away from a point source.

1 metre = 0 dB
2 metres = -6.02 dB
4 metres = -12.04 dB
8 metres = -18.06 db

Quote:
Originally Posted by vadi View Post
As a beginner I also found the maximum SPL Watt entry a bit confusing. I wondered if it was combined Watts or individual? For example I could use two individual amplifiers for two drivers or one amp with the drivers connected in parallel for one box?
The Maximum SPL watt entry is the Pmax value for a single driver.

Hornresp always assumes a single amplifier.

As indicated on page 14 of the Help file, Pmax is the rated thermal limited electrical input power of the driver. If Pmax is specified as 100 watts by the user (see attachment 1), then for two drivers in series or parallel (it doesn't matter which), Hornresp automatically sets the total electrical input power into the system to 2 x 100 = 200 watts (see sample results in attachment 2).

Kind regards,

David
Attached Images
File Type: png MaxSPL1.png (7.0 KB, 149 views)
File Type: png MaxSPL2.png (27.9 KB, 155 views)
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Old 21st August 2011, 06:58 AM   #2169
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Quote:
Originally Posted by NEO Dan View Post
For clarity I'd like to see the voltage and radiation angle (1pi,2pi) imprinted in the header or footer of the graphs.
Hi Dan,

I took the decision very early on, as a matter of principle, not to include anything on the chart windows that was already shown on the input parameters window. It would be difficult to know where to draw the line - if Eg was to be shown, then perhaps Rg should be shown also, and perhaps the driver configuration.

When a chart is printed as a hard copy however, all the input parameter values are included in the output, as part of the permanent record.

Kind regards,

David
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Old 21st August 2011, 11:49 AM   #2170
Mark Kravchenko --- www.kravchenko-audio.com
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I have a comment on the distance from the horn mouth.

Many individuals including myself have noted that a horns true response cannot be measured properly in the near field.

When measuring below about 300hz the wavelength of the frequency and the output from the horn seem to require a greater measurement distance in which to get an accurate representation of what horn does under normal useful conditions. Trying to measure 20hz at one meter generally looks ugly ragged and terrible. Take the same measurement out a distance and correct for the losses as David showed and you get a more accurate representation of what your box is doing.
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