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Old 25th June 2008, 04:42 AM   #141
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Quote:
Originally posted by aznboi3644
I see...David, kind sir, thank you for helping me through this. You have been a HUGE help.
Hi aznboi3644,

No problems. Glad to be of assistance :-).

Kind regards,

David
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Old 25th June 2008, 04:46 AM   #142
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Default Re: Hornresp companion program

Quote:
Originally posted by Kolbrek
For your interest, I have made a little program to make it easier to move Hornresp records from one computer to another.
Hi Bjørn,

Thanks for this.

Kind regards,

David
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Old 9th July 2008, 07:43 AM   #143
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Where is the L12 box at??
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Old 10th July 2008, 05:57 AM   #144
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I read the help file several times before I caught on. After S1 and S2 you have the option of typing c, e or h for the flare you want. L12 should appear by the third box when you choose c(onical).
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Old 10th July 2008, 08:36 AM   #145
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Quote:
Originally posted by boydon_lepasci
L12 should appear by the third box when you choose c(onical).
Hi Boydon and aznboi3644,

Just to clarify - L12 will only appear as the label for the "third box" when zero is entered into that box.

In the default record number 1, the L12 box is labelled "Con" and is alongside the F12 box. The L23 box is labelled "Exp" and is alongside the F23 box. The L34 box is just below the L23 box.

Hope this helps.

Kind regards,

David
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Old 11th July 2008, 06:47 AM   #146
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Thanks David. Obviously my eplanation was not on par with my understanding. I doubt I would ever have grasped practical horn design without your fabulous and ever-improving brainchild. Keep up the great work and I will leave instruction to the master.
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Old 31st July 2008, 04:17 PM   #147
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Hi David,

Over on the Collaborative Tapped horn project thread, we are trying to understand the relationship between the driver throat and the area at S2.

In Danley's Unity Summation Patent (US 6,411,718 B1) he said that the driver throat area and it's cooresponding horn area should match:

"...while the (mid range) drivers have a throat area of 10 sq in and enter the horn where the horn area is 10 sq in."

Does Hornresp expect the hole in the baffle of a tapped horn to be equal to the area at S2?

Thanks in advance,

~Don
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Old 1st August 2008, 01:35 PM   #148
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Quote:
Originally posted by Don Snyder
Does Hornresp expect the hole in the baffle of a tapped horn to be equal to the area at S2?
Hi Don,

No, not at all. The Hornresp tapped horn simulation model is quite flexible in this regard. Note that as from Version 18.10 a throat chamber can now also be included in the design, if required.

Kind regards,

David
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Old 22nd August 2008, 08:56 AM   #149
Kolbrek is offline Kolbrek  Norway
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Yesterday I finally got around to do some displacement measurements on my tapped horn prototype. I used an ACH-01 accelerometer tacked to where the dust cap meets the cone, which is about where the voice coil is attached. The accelerometer was hooked up to the PC sound card (Juli@) through an amplifier with a gain of 10, and the acceleration was measured with ARTA using a sine sweep at Fs=32khz to get good low frequency accuracy. The signal was fed to the horn through a power amp, giving 2.83Vrms at the terminals.

The impulse respone from ARTA was then exported into another program I have written for the purpose. It opens the impulse response, FFT-transforms it and multiplies the acceleration by sqrt(2)/(2*Pi*f)^2 to get the one way peak displacement, and corrects it for accelerometer sensitivity.

I had some problems uploading the screenshots of the results, so I put them on my webpage.

The Hornresp simulation

Measured displacement

As you can see, the Hornresp predictions are very close to reality.

Bjørn
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Old 22nd August 2008, 09:10 AM   #150
AndrewT is offline AndrewT  Scotland
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McBean will be pleased to hear you confirming his arithmetic.

Can you explain the 32kHz statement!!!!
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