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18th July 2011, 10:44 AM  #2011  
diyAudio Member

Quote:
b 

18th July 2011, 11:27 AM  #2012 
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Join Date: Apr 2010

Xoc1 ,bjorno,
thx for your answers ! Regards 
18th July 2011, 11:58 AM  #2013 
Mark Kravchenko
diyAudio Member

In the spirit of looking for improvements in Hornresp.
Maybe this already exists and I have not found it... Is there a place where Hornresp list vent air velocity when simulating a ported enclosure? 
19th July 2011, 06:51 AM  #2014 
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Join Date: Jun 2007

Hi blo06,
Thanks for the additional information. The following changes are required to the Hornresp input parameter values to make them equivalent to the given WinISD values. Cms  From 7,70E01 to 7,66E04 Rms  From 1,79 to 1,98 Mmd  From 11,50 to 9,81 Ap  From 10,20 to 81,71 With these changes the Hornresp Helmholtz resonance frequency becomes 32,40 hertz compared to the WinISD value of 32,36 hertz. Kind regards, David
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19th July 2011, 11:48 AM  #2015  
diyAudio Member

Quote:
No doubt that HR is a good and reliable predictor of ported boxes and IMO surpasses WinISD too but I think the provided T/S is off. See the picture: b Last edited by bjorno; 19th July 2011 at 12:00 PM. 

19th July 2011, 12:03 PM  #2016 
diyAudio Member
Join Date: Apr 2010

Hi David,
I get a better picture about the numbers. But it's not easy to get the right ones. I got them from the vendor site in french but all the same : Impédance (Z) 8 Ω Fréquence résonance (fs) 50 Hz Bande passante maximale f315000 Hz Puissance maximale 70 WMAX Puissance nominale (P) 35 WRMS Pression sonore moyenne (1 W/1 m) 92 dB Compliance susp. (Cms) 0,77 mm/N Masse mobile (Mms) 11,5 g Surtension méca. (Qms) 1,96 Surtension élec. (Qes) 0,7 Fact. surtension total (Qts) 0,52 Volume équ. (VAS) 48 l Résistance DC. (Re) 7,2 Ω Facteur de force (BxL) 6,1 Tm Inductance bobine (Le) 0,3 mH Diamètre bobine 25,5 mm Support bobine Alu Excursion linéaire (XMAX) ±1,6 mm Surface d'émission (Sd) 210 cm2 Poids aimant 17,7 oz. Poids 1,3 kg But even with that, it can be tricky to get the good numbers. So I fill the HR boxes with double clicking and answering the questions. This way CMS = 7,63E04 MMD = 11,53 BL = 6,55 RMS = 2.13 ... and of course the SPL response looks a bit different than with your numbers... How did you get them ? So what to do ? Anyway, I get a better picture of your (+++++) software, and begin to use it with better results. Thanks for all. Regards. 
19th July 2011, 06:57 PM  #2017 
diyAudio Member
Join Date: Aug 2007

Hi,
Another reason for the differences between Hornresp and WinIsd is that Hornresp doesn't take box losses (wall leakage mostly, I think) into account (correct me if I'm wrong, David). These losses are often added in bass reflex models by a Qfactor QL. I think the value used in WinIsd is QL = 7, while in hornresp the equivalent would be to set QL=infinity. The significance of this depends on the Qvalues in other parts of the system. I suspect WinIsd uses the transfer functions given by Small, Thiele, Leach etc. to calculate the response. Hornresp uses a more sophisticated model. Bjørn 
19th July 2011, 10:04 PM  #2018 
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20th July 2011, 06:39 AM  #2019  
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Join Date: Jun 2007

Quote:
Using the WinISD driver parameter values you provided I simply generated the unknown electromechanical values from the equivalent ThieleSmall parameters using the Hornresp 'Calculate Parameter' tool. I used the following given values: Sd = 210,00 Bl = 6,10 Le = 0,30 Re = 7,20 And calculated: Cms from Sd and Vas. Mmd from Sd, Cms and fs. Rms from Cms, fs and Qms. Kind regards, David
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20th July 2011, 06:51 AM  #2020  
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Join Date: Jun 2007

Quote:
Thanks for pointing this out. Kind regards, David
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