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Old 3rd August 2009, 06:32 AM   #721
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Hi sumsound,


Quote:
Originally posted by sumsound
It would be pretty odd to have an amplifier that delivers constant wattage to any load.
So true :-).


Quote:
Originally posted by sumsound
Is there a way to see what maximum output is for constant voltage, with respect to xmax?
Calculate the results for a given value of Eg and then check the Diaphragm Displacement chart to see if the excursion has exceeded the Xmax value for the driver you have specified. After a few iterations using different values of Eg you should be able to find the maximum constant voltage that can be applied to the loudspeaker without exceeding Xmax at any frequency.

Remember though, in practice a normal audio signal voltage will not be constant at all frequencies :-).

Kind regards,

David
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Old 30th August 2009, 05:50 AM   #722
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Default Hornresp Version 23.10

Hi Everyone,

Hornresp Version 23.10 has just been released. Product Number 2310-090830 refers.

The Horn Segment Wizard tool can now also be used with Le Cléac'h horn designs.

Kind regards,

David
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Old 30th August 2009, 06:49 AM   #723
soongsc is offline soongsc  Taiwan
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Great! I've been wanting to try out some low frequency horn designs.
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Old 30th August 2009, 11:21 AM   #724
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Any chance that we will be able to change Q of the port/vent in the future?
Basta! does this and you can then simulate an "aperiodic" box.
But you can't add a horn in Basta!.

You can find it here in case you haven't seen it. http://www.tolvan.com/basta/
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Old 1st September 2009, 06:11 AM   #725
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Quote:
Originally Posted by David_Web View Post
Any chance that we will be able to change Q of the port/vent in the future?
Hi David_Web,

It is highly unlikely.

Kind regards,

David
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Old 23rd September 2009, 06:24 PM   #726
tb46 is offline tb46  United States
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Default Compound Horn?

Hi David,

The other night I was playing around with the compound horn arrangement, trying to use it for something (think Altec 816) with: 1. short exponential front horn, 2. large vented rear chamber, 3. short exponential rear horn (used as reflex port). This seemed to model just fine (well, the response may well be too fine :-)). Looking a little closer I found the following:

- there is a point where reducing Area S2 (front horn mouth) by as little as 1cm^2 markedly affects the low end, and
- the same thing happens when reducing Area S6 (rear horn mouth) from the input screen value shown.

I'll attach the input screen for your information. It would be great if the compound horn arrangement could be used reliably for cases like this one.

Thought you might find this interesting.

Regards,
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File Type: jpg 2009_Sep23_Compound_1_Input_small.jpg (35.3 KB, 181 views)
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Old 24th September 2009, 06:08 AM   #727
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Quote:
Originally Posted by tb46 View Post
Thought you might find this interesting.
Hi Oliver,

Many thanks - I certainly do find it interesting!

When I first calculate the combined response for your example, I get a particular result. If I then calculate the combined response again (without changing anything) I get a different result - see attached comparison. There is definitely a bug somewhere :-).

I will investigate over the next few days, and let you know what I find.

Kind regards,

David
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File Type: jpg bug.jpg (43.2 KB, 165 views)
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Old 24th September 2009, 08:27 AM   #728
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Quote:
Originally Posted by David McBean View Post
I will investigate over the next few days, and let you know what I find.
Hi Oliver,

Just letting you know that the bug you reported has been fixed - it only took one keystroke to rectify :-). I had been using a variable named S2 in a formula when I should have in fact been using S22 (a typographical error on my part). Unfortunately the combined response for your example is now not as impressive as it once was :-).

Thanks again for bring this bug to my attention - it was causing quite a serious error in the results!

The corrected Hornresp release is Product Number 2310-090924.

Kind regards,

David
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Old 24th September 2009, 01:56 PM   #729
tb46 is offline tb46  United States
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Smile Post #728, Compound Horn

Hi David,

Thanks for getting to this problem as quickly as you did. I'm happy you were able to find an easy to fix cause.

I did not believe the impressive low frequency output :-), that's what got me to look at it a little closer. The data I'm getting now looks a lot more real, still quite nice though. I'm also having a bit of a problem with a simulation of the Lowther TP1 London, but I'm still extracting data from the drawing. I'll post it as soon as I have something.

Thanks again for the quick response,
Regards,
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Old 24th September 2009, 02:39 PM   #730
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Hi David,

Is it possible that, after you've typed the length in L12 (etc.) the horn flare automatically adjusts to, say conical, instead of requiring the push of that extra button, (like C, H or E) that I regulairy forget?

I know, I know but it just keeps on happening (and resetting)

Best regards Johan
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