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Old 23rd December 2010, 10:34 AM   #1521
epa is offline epa  Netherlands
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hi david and all

how does one calculate ATC
maybe use thes examples
VTC is 150ltrs 60*50*50


Click the image to open in full size.


tnx in advance
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Old 24th December 2010, 05:44 AM   #1522
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Quote:
Originally Posted by epa View Post
how does one calculate ATC
Hi epa,

There is no standard way to do this. It all depends on the actual physical configuration of the throat chamber in relation to the driver diaphragm. As a first approximation though, most users simply set Atc = Sd. Note that if the "resonances masked" option is used then the value chosen for Atc has no effect on the results anyway :-).

Kind regards,

David
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Old 24th December 2010, 12:19 PM   #1523
epa is offline epa  Netherlands
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Quote:
Originally Posted by David McBean View Post
Hi epa,

There is no standard way to do this. It all depends on the actual physical configuration of the throat chamber in relation to the driver diaphragm. As a first approximation though, most users simply set Atc = Sd. Note that if the "resonances masked" option is used then the value chosen for Atc has no effect on the results anyway :-).

Kind regards,

David
if i use the wizzard (chamber) it says ltc =x,xx cm
this lts has a big influens on fr.
if the speaker fire's straight its easy to check ltc with the drawing.
but if the chamder is like the examples,im not sure how check it.
i use it in this case for a tqwtp.
can i mearure ltc like the line's in my example ?
many tnx david
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Old 26th December 2010, 06:55 AM   #1524
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Quote:
Originally Posted by epa View Post
can i mearure ltc like the line's in my example ?
Hi epa,

Yes. Once Ltc is known, Atc = Vtc / Ltc.

Kind regards,

David
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Old 27th December 2010, 07:06 AM   #1525
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Default Hornresp Version 28.30

Hi Everyone,

The latest release has the following changes:

1. Loudspeaker Wizard area slider ranges are now automatically set based on the maximum cross-sectional area of the horn system. This applies to all loudspeakers, not just tapped horns.

2. The maximum value that can be entered directly into an area slider is 99999.99 and the maximum value that can be entered by scrolling is 99990.00. Previously the maximum value for tapped horns was restricted to a lesser amount due to inherent limitations in the Microsoft Visual Basic scroll bar control (a scaling technique has been developed to get around this limitation).

3. The Spacebar key scaling change feature introduced with the last release has been removed.

4. Manual / Auto settings are preserved when the Loudspeaker Wizard is closed using the Save button. The settings remain in place when the Wizard is re-opened using the same record, but are ultimately lost when a new record is selected.

My thanks again to David_Web, Mark and Oliver for their valuable feedback.

Please let me know if you find any bugs.

Kind regards,

David
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Old 27th December 2010, 11:47 AM   #1526
Mark Kravchenko --- www.kravchenko-audio.com
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I started playing with it but nothing strange yet.
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Old 27th December 2010, 01:20 PM   #1527
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Awesome!
I find it so much easier and faster to work with now.
Especially on a slower laptop like this where it's pretty slow so scroll using buttons.
The "jumping sliders" should not be an issue when people get used to it. I find the behavior pretty intuitive.

Regarding 4. Perhaps a check could be done to see if the derived value differs from the value on the input page and then turn it to manual if so. That way when someone manually changed the value on the input page that would not be lost.
Although it should not be that big of an issue but it would cover some situations.
Thanks for saving the state between auto and manual, makes is so much easier to work with. I have numerous times forgot to change it to auto and spent a little while wondering why it didn't behave like I'm used to =)

When thinking back it is amazing how much easier, more intuitive and faster you have made working with different horns and tapped pipes.
You have simply taken the difficult and complex beasts and tamed them down to ordinary peoples level. It still takes a good thought and understanding to make something really good but the part that required a math degree and numerous sheets of paper is no longer a big barrier for people that want to build a horn, tapped pipe or even a simpler BR.
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Old 27th December 2010, 02:03 PM   #1528
tb46 is offline tb46  United States
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Hi David,

I second David_Web's remarks. This is truly an enabling piece of technology.

Haven't found any bugs yet, all seems well.

Merry Christmas and a Happy New Year!

Thanks,
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Old 28th December 2010, 06:25 AM   #1529
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Quote:
Originally Posted by mwmkravchenko View Post
I started playing with it but nothing strange yet.
Thanks Mark.

Please keep looking though - there is bound to be something I have missed :-).

Kind regards,

David
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Old 28th December 2010, 07:07 AM   #1530
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Hi David_Web,

Quote:
Originally Posted by David_Web View Post
The "jumping sliders" should not be an issue when people get used to it.
Hopefully the advantages of the maximum value scaling system will more than make up for any perceived problems due to jumping sliders.

Quote:
Originally Posted by David_Web View Post
Regarding 4. Perhaps a check could be done to see if the derived value differs from the value on the input page and then turn it to manual if so.
Good idea - thanks for the suggestion. I will see what I can do.

Quote:
Originally Posted by David_Web View Post
When thinking back it is amazing how much easier, more intuitive and faster you have made working with different horns and tapped pipes.
You're welcome :-).

Kind regards,

David
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