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Old 18th October 2008, 07:55 AM   #221
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Hi MaVo,


Quote:
Originally posted by MaVo
In your help file for the system design function, you write that it designs an optimum system for the given frequency range and driver. Now, I observed that the frequency response often has these little and regular peaks, while handmade designs can have a flatter frequency response within the same size restrictions.
Many thanks for the feedback. From the tests I did originally, I thought that the System Design tool came up with the best overall compromise in terms of size (system volume) versus performance (efficiency, SPL response, diaphragm displacement, etc) - that is why I decided to use the word "optimum". In view of your comments however, perhaps I should reconsider this position :-).


Quote:
Originally posted by MaVo
Hornresp v20 looks like a great improvement, I got random crashes on my amd/winxp system with v19 and before, especially while running other software in the background, which seem to have stopped now.
That is great news, thanks for letting me know.

Kind regards,

David
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Old 18th October 2008, 08:18 AM   #222
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Hi David,

Did a couple of TH sims this morning and it all worked fine, once I worked out how to use some of the new features. My last version was from early May or thereabouts.
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Old 18th October 2008, 09:11 AM   #223
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Quote:
Originally posted by Brett
Did a couple of TH sims this morning and it all worked fine.
That sounds good, thanks Brett.

Kind regards,

David
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Old 18th October 2008, 11:48 PM   #224
brsanko is offline brsanko  United States
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Why does the combined response always drop off after 1khz?
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Old 19th October 2008, 01:54 AM   #225
defwing is offline defwing  New Zealand
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Seems to give same results on Windows Server 2008 64bit(Basically Vista) as 32bit XP so that part seems fine.

Great software, thanks for giving your time and expertise to a free project.
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Old 19th October 2008, 07:48 AM   #226
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Quote:
Originally posted by brsanko
Why does the combined response always drop off after 1khz?
Hi brsanko,

Mainly because the driver diaphragm is modelled as a rigid plane piston, and directivity effects are not taken into account. See Note 2 in the Hornresp Help file for further details.

Note however that it is theoretically possible to produce a more extended response - it all depends on the input parameter values.

Kind regards,

David
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Old 19th October 2008, 07:52 AM   #227
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Quote:
Originally posted by defwing
Seems to give same results on Windows Server 2008 64bit(Basically Vista) as 32bit XP so that part seems fine.
That is excellent news, thanks defwing.

Kind regards,

David
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Old 22nd October 2008, 01:40 PM   #228
MaVo is offline MaVo  Germany
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Hi David, concerning your automatic horn design tool:

I have been researching some old lab posts and discovered one in which Thomas Danley has written some numbers for an optimal driver for horn loading. Compared to the numbers your system design tool (from specifications) computes, his advice goes for heavier membranes, with a difference factor of about 2-3 times your numbers. Except this difference, the relationship of compression factor and frequency band with membrane weight and motor strength seem to follow the same guidelines in both your and his math. (for ease of use i ignore mms and mmd, since the difference is about 200-300%).

For a 15inch driver, 28-112hz, 1:1 compression, your model proposes a 65g membrane, while Tom would use 178g.

Here is the post i refer to: http://www.live-audio.com/messages/archive4/126294.html

Could you explain where this difference comes from? Well, i think you wont know his math, but maybe you could make a guess or give some hint how you arrive at these numbers?
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Old 22nd October 2008, 02:01 PM   #229
Kolbrek is offline Kolbrek  Norway
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I think Tom Danley calculates the mass from upper corner frequency alone, while in Hornresp other relations are taken into account too.

Bjørn
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Old 22nd October 2008, 03:09 PM   #230
MaVo is offline MaVo  Germany
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All i know is that he uses a custom computer program. I suppose his math is exact. Which doesnt mean Davids isnt, since they could mean different things with "optimal". I dont know.
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