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Old 11th February 2011, 05:26 AM   #1651
soho54 is offline soho54  United States
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Neo Dan,

It isn't too hard.

Here is an example:

You run a Maximum SPL on a DTS-10 with 1000w, and 15mm. Double click it, enter the frequency of the lowest red point in the passband, and you get 26.418v, at ~26 watts.

Then run through the wizard, and add voltage while looking at the displacement, and it will be the same. You can just enter the voltage into the box once you learn to trust it. If you Sample a couple different frequencies on this graph though, you will find you are still at ~26w at 19Hz still, but 305w at 35Hz.

These are the two graphs you get.
Click the image to open in full size.

Does that make more sense?

To add to what McBean said, you would use a really high xmax to get a constant wattage source. Like 1000w and 99.9mm xmax (HR limit.)
Click the image to open in full size.
It will look similar to the impedance curve if enough power and xmax is added.

Last edited by soho54; 11th February 2011 at 05:47 AM.
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Old 11th February 2011, 09:31 AM   #1652
NEO Dan is offline NEO Dan  United States
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I fully understand how it works, and I don't like how you are using it:
Link
Click the image to open in full size.
Way to take an unquailfied dump on the DTS-10 bro, are you proud? This is earth, we don't generally power speakers with constant wattage sources.

I can't belive you did that. Thanks for proving my point...

This tool should be voltage driven instead of power.
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Old 11th February 2011, 12:53 PM   #1653
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That's what the normal SPL graph is for!


David, would it be possible to export the drive voltage when you export a curve made by the max SPL tool?
Together with power, current and phase if possible?
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Old 11th February 2011, 02:51 PM   #1654
soho54 is offline soho54  United States
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Quote:
Originally Posted by NEO Dan View Post
I fully understand how it works, and I don't like how you are using it:
So using it in a direct comparison to another Hornresp Maximum SPL graph at 1000w is somehow a problem?

See: http://www.avsforum.com/avs-vb/showt...0#post19983190 and the discussion following it starting at: http://www.avsforum.com/avs-vb/showt...8#post19984458 Specifically: http://www.avsforum.com/avs-vb/showt...8#post19986138

I'm sorry you have issues with the tool, but that does not invalidate it. At no point do I see anyone stating that this is a straight FR graph, because it isn't.

Quote:
Way to take an unquailfied dump on the DTS-10 bro, are you proud? This is earth, we don't generally power speakers with constant wattage sources.
An "unquailfied dump?" Are you sure you understand the graph?

Last edited by soho54; 11th February 2011 at 03:11 PM.
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Old 11th February 2011, 03:18 PM   #1655
GM is offline GM  United States
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Quote:
Originally Posted by David McBean View Post
The bug identified by GM has now been fixed.
Greets!

So it seems, no problems opening them with the LW now, thanks!

GM
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Old 11th February 2011, 03:34 PM   #1656
Mark Kravchenko --- www.kravchenko-audio.com
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The new version works flawlessly for me to!

Thanks David.

Maybe our friends will be a little less grumpy after a good sleep. Burning the midnight oil catches up to all of us sooner or later.
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Old 11th February 2011, 05:56 PM   #1657
NEO Dan is offline NEO Dan  United States
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The Maximum SPL tool is not a good tool for comparison of SPL output.

How "big" would an amp have to be to supply 1000 watts into the DTS-10?
Click the image to open in full size.

The coils of an actual DTS-10 are in series in this graph, but watts are watts right? So again, how "big" an amp would be requred to generate the displacement limited SPL indicated in your graph???
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Last edited by NEO Dan; 11th February 2011 at 06:02 PM.
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Old 11th February 2011, 06:13 PM   #1658
NEO Dan is offline NEO Dan  United States
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At best the Maximum SPL tool could be used to gage thermal cooling capacity if you could determine reliably the ammount of excursion required to effectivly dissipate a given thermal load. In that usage red is passing and black represents thermal failure.
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Old 12th February 2011, 02:30 AM   #1659
tb46 is offline tb46  United States
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Default Front Loaded Tapped Horn v. Offset Tapped Horn

Hi David,

Would it be reasonably possible to provide for two different tapped horn models, similar to the current two different horn models: front loaded horn and offset horn? I have found from running quite a number of tapped horn models that many models do benefit from minimizing L12, ideally the driver would energize the horn at S1 instead of S2, you might call this the front loaded tapped horn, versus entering the horn path at S2 for your current offset tapped horn. In the bargain you would gain an additional section for modeling this type of tapped horn, making the program even more versatile.

Thanks also for the lastest update, have not found any bugs yet.

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Old 12th February 2011, 07:39 AM   #1660
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Quote:
Originally Posted by David_Web View Post
Would it be possible to export the drive voltage when you export a curve made by the max SPL tool? Together with power, current and phase if possible?
Hi David_Web,

And here's me thinking that the Sample tool already provided "more than sufficient" information :-).

From a practical viewpoint I wonder just how useful such additional data might be - it seems that there is enough confusion out there already, when it comes to interpreting the Hornresp Maximum SPL chart :-).

By 'drive voltage' do you mean Eg, or the voltage at the voice-coil taking into account Rg losses? By 'phase' I assume you mean the phase difference between voltage and current?

Kind regards,

David
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Last edited by David McBean; 12th February 2011 at 07:42 AM.
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