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Old 16th April 2018, 08:40 PM   #8221
weltersys is offline weltersys  United States
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Quote:
Originally Posted by neets View Post
Hi all.

Please forgive me for asking a silly question, but where can I actually get the HornResp-programme?

Regards
It's at the bottom of David McBean's current posts:
Hornresp

But oddly, not in this thread's OP, which could be updated by him at any time.

David, if you do update the OP, for historical purposes it would be interesting to note when V.1 originated, and when the first web appearance occurred.

The thread is at 963,141 views, closing in on the million mark!

Art

Last edited by weltersys; 16th April 2018 at 08:56 PM.
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Old 16th April 2018, 09:03 PM   #8222
mwmkravchenko is offline mwmkravchenko  Canada
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Hornresp
Quote:
Originally Posted by weltersys View Post
It's at the bottom of David McBean's current posts:
Hornresp

But oddly, not in this thread's OP, which could be updated by him at any time.

David, if you do update the OP, for historical purposes it would be interesting to note when V.1 originated, and when the first web appearance occurred.

The thread is at 963,141 views, closing in on the million mark!

Art
Art you have the same amnesia that I have 😁
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Old 17th April 2018, 09:20 AM   #8223
David McBean is offline David McBean  Australia
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Hi Andre,

Quote:
Originally Posted by Andre Vergison View Post
Wanting to compute a simple vented box, here's my driver file (hand crafted):

RCF L18P400

Sd=1220.00
Bl=24.2
Mmd=200
Le=2.50
Re=5.10
Pmax=1000
Xmax=9.0
LossyLe=0
Qes=0.29
Qms=7.6
Qts=0.28
Vas=340
fs=29

Following your recommendation...
> Select the 'Rear Vented' option from the Chamber Type tool and set S1 to L45 = 0 and Vrc, Lrc, Ap and Lpt > 0.

However, after pasting the driver into the record I got "Invalid result. Change input data."
The format, contents and parameter order of the driver file should be as shown below:

RCF L18P400

Sd=1220.00
Bl=24.20
Cms=1.60E-04
Rms=4.51
Mmd=200.00
Le=2.50
Re=5.10
Pmax=1000
Xmax=9.0
LossyLe=0

Attempting to "hand craft" a driver file is definitely not recommended :-).

Always let Hornresp generate your driver files using File > Copy Driver to Database, after first having entered the driver parameter values via the Input Parameters window.

Quote:
Originally Posted by Andre Vergison View Post
the RCF T/S params are missing Cms and Rms
Double-click on the Cms and Rms input boxes and follow the instructions to enter the equivalent Thiele-Small parameter values. If you would rather specify the driver using Thiele-Small parameters only (rather than a mix of Thiele-Small and electro-mechanical parameters) then double-click on the Sd input box.

Using your given driver electro-mechanical values and calculating the required Cms and Rms values from Thiele-Small equivalents, your input parameters window should look like Attachment 1. Alternatively, using your given Thiele-Small values only, your input parameters window should look like Attachment 2.

Quote:
Originally Posted by Andre Vergison View Post
Double clicking on Le showed the following values in the Semi-Inductance Model window: RE', Leb, Le and Ke all filled in, but the Rss field empty.
If the driver data is entered correctly, the initial values of the Semi-Inductance Model parameters (including Rss) will all be zero.

Kind regards,

David
Attached Images
File Type: png Attach_1.png (53.2 KB, 149 views)
File Type: png Attach_2.png (52.9 KB, 140 views)
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Old 17th April 2018, 09:28 AM   #8224
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by neets View Post
where can I actually get the HornResp-programme?
Hi neets,

Google is your friend :-).

Kind regards,

David
Attached Images
File Type: png Attach_1.png (40.3 KB, 138 views)
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Old 17th April 2018, 09:34 AM   #8225
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by weltersys View Post
But oddly, not in this thread's OP, which could be updated by him at any time.
Hi Art,

I did not realise that it was possible for me to edit my original post. Thanks for enlightening me :-).

Kind regards,

David
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Old 17th April 2018, 11:19 AM   #8226
weltersys is offline weltersys  United States
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Quote:
Originally Posted by David McBean View Post
Hi Art,

I did not realise that it was possible for me to edit my original post. Thanks for enlightening me :-).

Kind regards,

David
David,

I was enlightened to that feature sometime between 2011 and 2014, have used it extensively as I continue to find more mistakes to redact in most of my OPs.

Editing one's other posts can be done by moderators by request if one fears that the errors are inhuman, and the divas won't forgive :^).

Art
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Old 17th April 2018, 03:31 PM   #8227
mwmkravchenko is offline mwmkravchenko  Canada
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Quote:
Originally Posted by weltersys View Post
David,

I was enlightened to that feature sometime between 2011 and 2014, have used it extensively as I continue to find more mistakes to redact in most of my OPs.

Editing one's other posts can be done by moderators by request if one fears that the errors are inhuman, and the divas won't forgive :^).

Art
There are divas on diyaudio!!!!

Say it ain't so.
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Old 18th April 2018, 05:18 AM   #8228
bolserst is offline bolserst  United States
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Quote:
Originally Posted by David McBean View Post
…CHANGE 5
Semi-inductance and frequency-dependent damping (FDD) models have been added.
Many thanks for figuring out an elegant way to work these more advanced transducer models into Hornresp. As you can see in attachments #1 & #2, the semi-inductance model output from Hornresp provides a satisfying match with nearfield measurement for the Dayton Classic 12” subwoofer posted previously here: Inductance Cancellation Techniques

As another test, I decided to try and use the free-air impedance curve images posted on Databass to determine the semi-inductance parameters by hand. I chose two drivers that were on either end of the Lossy-Le correction spectrum, the Dayton HO18, and the ER Audio XXX 18. It would have been nice if a nearfield measurement was included in the Databass plot set, but I understand why it isn’t. So, to try and compare prediction to ground plane measurements an enclosure diffraction increment needs to be added(aka baffle step). I used the BTM diffraction method (Baffle edge diffraction with dipole radiation), although I think the EDGE diffraction tool would get you pretty close in this case.

For each woofer I calculated response with the Traditional TSP model, the Lossy-Le model, and the Semi-Inductance model. Each plot has 3 curves: blue= databass measurement, black dotted = 2pi calculated response, red = 2pi calculated response + diffraction. Pretty nice agreement considering the hand work involved in selecting the Semi-Inductance parameters and the estimate of diffraction. One thing I found interesting is that the HO18 inductance nearly provides built in baffle step compensation.
Attached Images
File Type: png DC12_Hornresp_semiL_Inputs.png (25.3 KB, 122 views)
File Type: png DC12_Hornresp_semiL_dB.png (29.8 KB, 116 views)
File Type: png Hornresp_Model_Compare.png (449.6 KB, 51 views)
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Old 18th April 2018, 07:53 AM   #8229
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by bolserst View Post
Many thanks for figuring out an elegant way to work these more advanced transducer models into Hornresp. As you can see in attachments #1 & #2, the semi-inductance model output from Hornresp provides a satisfying match with nearfield measurement for the Dayton Classic 12” subwoofer posted previously here: Inductance Cancellation Techniques

As another test, I decided to try and use the free-air impedance curve images posted on Databass to determine the semi-inductance parameters by hand. I chose two drivers that were on either end of the Lossy-Le correction spectrum, the Dayton HO18, and the ER Audio XXX 18. It would have been nice if a nearfield measurement was included in the Databass plot set, but I understand why it isn’t. So, to try and compare prediction to ground plane measurements an enclosure diffraction increment needs to be added(aka baffle step). I used the BTM diffraction method (Baffle edge diffraction with dipole radiation), although I think the EDGE diffraction tool would get you pretty close in this case.

For each woofer I calculated response with the Traditional TSP model, the Lossy-Le model, and the Semi-Inductance model. Each plot has 3 curves: blue= databass measurement, black dotted = 2pi calculated response, red = 2pi calculated response + diffraction. Pretty nice agreement considering the hand work involved in selecting the Semi-Inductance parameters and the estimate of diffraction. One thing I found interesting is that the HO18 inductance nearly provides built in baffle step compensation.
Hi bolserst,

Excellent information - many thanks for posting it!

Kind regards,

David
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Old 18th April 2018, 03:24 PM   #8230
mwmkravchenko is offline mwmkravchenko  Canada
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Hornresp
THanks for the links and the data Steve.

And thanks to David who was willing to do the incorporation of all this advanced calculations into Hornresp.

Getting closer to the real deal is the sole aim of a good simulator.

I'm going to be doing a decently large sample sett of measurements in the next coming months. And I will be eagerly doing comparisons between these measurements and simulations via Hornresp.
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