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Old 12th June 2011, 10:04 AM   #1961
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Quote:
Originally Posted by revintage View Post
Hey Dirkwright,
All data needed for simulations in Hornresp is in the original datasheet. Did some simulations with different hornmodels and they looked acceptable/useful. I also tried some compression and it looked even better.

How the driver/horn behaves at higher frequencies is already known so concenterate on the behaviour at lower frequencies. If you want the horn to be useful from 500Hz you should go for something like 300-3500Hz Fc.

Do you really think the sensitivity is good enough?
The data sheet I have does not have Cms, or Rms. It also has none of the rear chamber data.
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Old 12th June 2011, 11:59 AM   #1962
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Cms or Rms aren´t needed, they are caculated by the program.

About rear chamber you are right, but it can be predicted by trial&error. Or why not check the drawing, my guesstimate from that is 0,5dm3.

Last edited by revintage; 12th June 2011 at 12:06 PM.
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Old 12th June 2011, 01:44 PM   #1963
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D54AF in a 250Hz Tractrix
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File Type: png 250D54.png (35.1 KB, 182 views)
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Old 12th June 2011, 04:31 PM   #1964
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I have the plain D54 driver. I bought this horn about 20 years ago from Bruce. He said it was intended for this driver. I believe the D54AF is slightly different than the one I have. I can't get any kind of reasonable SPL response with the data I have. I wonder if I should look for a different driver for this horn.
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Old 12th June 2011, 05:06 PM   #1965
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The D54 sims close to the same as the AF.

But if you have the horn and the driver why bother simulating it? Measure it IRL and listen instead.

Last edited by revintage; 12th June 2011 at 05:14 PM.
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Old 12th June 2011, 05:49 PM   #1966
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Quote:
Originally Posted by revintage View Post
The D54 sims close to the same as the AF.

But if you have the horn and the driver why bother simulating it? Measure it IRL and listen instead.
Well, I want to understand it. One problem I have is that the Vas isn't listed for this driver, so I can't use the spreadsheet I have to derive the tractrix horn shape. Also, if I put in the throat dimensions, which I assume are close to 2" square, the response in Hornresp is awful. If I reduce the throat size substantially, the response improves. I'm using:
Ang = free space
Expansion is Tractrix
S1 = 28
S2 = 368
F12 = 500
Sd = 28
BL = 8.1
Cms = .0004
Rms = .01
Mmd = 2.78
Re = 4.6
Le = .07
Vre = .01
Lrc = .1
Fr = 1
Tal = .1
Vtc, Atc = 0

The response doesn't look anything like what you showed. Thanks for your help!
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Old 13th June 2011, 08:21 AM   #1967
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Quote:
Originally Posted by dirkwright View Post
One problem I have is that the Vas isn't listed for this driver.
Hi dirkwright,

The Dynaudio D54 driver parameter values you require are:

Sd = 28.00
Bl = 8.10
Cms = 5.70E-05
Rms = 7.98
Mmd = 3.54
Le = 0.07
Re = 4.60
Nd = 1

Kind regards,

David
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Old 13th June 2011, 10:17 AM   #1968
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Vas=0,1dm3 is what I have found. But using the std formula I get 0,626dm3 (or is 0,0626dm3)?

Last edited by revintage; 13th June 2011 at 10:29 AM.
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Old 13th June 2011, 10:25 AM   #1969
AndrewT is offline AndrewT  Scotland
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What is a dm3?
decimetre cubed?

Could you convert that to cubic metre or to litre or to something defined and commonly known.
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Old 13th June 2011, 11:23 AM   #1970
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1 dm3 is the European metric standard way to define 1 litre and this is AFAIK commonly known. I can convert it to pints though.
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