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Old 5th August 2011, 07:31 PM   #2091
AndrewT is offline AndrewT  Scotland
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Just go back a few posts and you'll see D.McB's announcement.
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Old 5th August 2011, 08:33 PM   #2092
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Quote:
Originally Posted by AndrewT View Post
Just go back a few posts and you'll see D.McB's announcement.
I'm asking how far back before version 18 do I need to go to have the S2-S3 driver orientation for a 5 segment TH. I have the latest Hornresp, and it's great but...
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Old 7th August 2011, 07:29 AM   #2093
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Originally Posted by tb46 View Post
It would be nice to have the compare feature with the new windows.
Hi Oliver,

I was wondering how long it would take for someone to raise this point :-).

I will see what can be done for the next release...

Kind regards,

David
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Old 7th August 2011, 07:40 AM   #2094
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Hi Dan,

Quote:
Originally Posted by David McBean View Post
Unfortunately it would now require a considerable amount of work (particularly with the Loudspeaker Wizard) to make the position of the 4-segment drive points optional
As advised via e-mail, I am currently working on adding the requested feature back into Hornresp as a fully-integrated option.

Kind regards,

David
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Old 7th August 2011, 03:58 PM   #2095
NEO Dan is online now NEO Dan  United States
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Quote:
Originally Posted by David McBean View Post
Hi Dan,



As advised via e-mail, I am currently working on adding the requested feature back into Hornresp as a fully-integrated option.

Kind regards,

David
Thanks David!
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Old 8th August 2011, 04:38 PM   #2096
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Quote:
Originally Posted by David McBean View Post
Hi Everyone,

The new sampling functionality requested by littlemike has now been added to Hornresp. Simply click on any chart to sample at the selected frequency, drag the red marker line to sweep frequencies, or press the Esc key to exit.

Note that the original Sample tool has not changed. It can still be accessed by either:

1. Selecting the Tools > Sample... menu command.
2. Pressing keys Alt, T and S.
3. Pressing the F3 function key.
4. Double-clicking on the chart window area.

Product Number 2860-110805 refers.

Kind regards,

David
Thank you VERY MUCH!
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Old 10th August 2011, 09:13 PM   #2097
epa is offline epa  Netherlands
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i like the sampling to
need to learn the other features and how to interped them.
tnx again david.
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Old 14th August 2011, 12:52 PM   #2098
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Default tractrix horn reactance annulling

Hello, I have a question or two about reactance annulling in tractrix horns as simulated in your software. Are we supposed to adjust the rear chamber volume to flatten out the electrical impedance peak? It seems that if I use a value for Vrc that is calculated from one of the existing formulas, like Leach's, the electrical impedance curve still shows a peak, but the low frequency SPL response is really good, whereas if I change Vrc (by making it smaller), the peak goes away but the low frequency SPL response goes down a few dB. If I make the rear chamber larger than the calculated value, above a certain value of Vrc, the low frequency response (-3dB point) is not affected any more but the long cut off curve changes slope. It seems to me that the calculated value for Vrc is about right for the -3dB point, but the electrical impedance peak remains. Why do we worry about the electrical impedance peak in horn loudspeakers anyway? I'm missing some kind of information on that. Also, why can't we just make up a passive RLC notch filter to cancel out the electrical impedance peak?

I've attached two images that show the SPL and electrical impedance curves for a horn where the only difference is the size of Vrc. The dark curves are for a small Vrc and the light ones are for a large Vrc.
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File Type: jpg 12PE32 60Hz tractrix SPL comparo.JPG (43.4 KB, 80 views)
File Type: jpg 12PE32 60Hz tractrix impedance comparo.JPG (41.8 KB, 80 views)
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Old 14th August 2011, 02:49 PM   #2099
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Of course, the displacement at resonance does go very high with the larger Vrc as shown in the attached image.
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File Type: jpg 12PE32 60Hz tractrix displacement comparo.JPG (41.9 KB, 74 views)
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Old 14th August 2011, 02:52 PM   #2100
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The group delay is worse with a smaller Vrc though. The dark curves are for a small Vrc and the light ones are for a large Vrc.
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File Type: jpg 12PE32 60Hz tractrix group delay comparo.JPG (38.9 KB, 70 views)
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