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 10th July 2009, 11:23 AM #701 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan I would think true polarity is very important in sound reproduction. It is my experience, that if a system has good enough fidelity, the difference between polarity if very evident and audible. __________________ Hear the real thing!
 10th July 2009, 12:23 PM #702 Jmmlc   R.I.P.   Join Date: Oct 2005 Hello Soongsc, Most transfer function in electroacoustics lead to non linear variation of the phase of more than 2 Pi between 20Hz and 20000Hz so the notion of "True polarity" has very little meaning in the absolute. It is even worst when it comes to an acoustic device with multiple source (e.g.: a tapped horn as modelized in Hornresp using the "conbined response "). Many people define the polarity from a pulse measurement. If the pulse rises upward then the polarity is said "correct" .If the pulse comes downward then the polarity is said "inverted". Sometimes this correct polarity (within the bandwith) is not the true polarity. I prefer myself to take as a basic hypothesis that, after group delay compensation, the phase between the frequency limits of the useful bandwith of the device has the correct polarity when it varies around 0° and reversely to say that the phase has the wrong polarity (inside the useful bandwith) when it varies around +180 or -180degrees). One of the main goals for someone using Hornresp is to try to obtain a more linear phase versus frequency (d_phase / d_pulsation = k ) inside the bandwith of the device. But using the true polarity in a phase graph limited to -Pi to + Pi as in Hornresp leads to a more difficult analysis when the polarity is opposite (according to the definition I gave). The "polarity check" module inserted in Hornresp while providing a better presentation of the phase has for goal an easier analysis. Finally: the presentation of the phase depends on the use we want to do with it. In that thread, I once asked the question "what Hornresp users do with the phase curve". As long as nobody replies to that question I think that the best presentation of the phase is the one we have now. Best regards from Paris, France Jean-Michel Le Cléac'h [ QUOTE]Originally posted by soongsc I would think true polarity is very important in sound reproduction. It is my experience, that if a system has good enough fidelity, the difference between polarity if very evident and audible. [/QUOTE]
David McBean
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally posted by Jmmlc Finally: the presentation of the phase depends on the use we want to do with it. In that thread, I once asked the question "what Hornresp users do with the phase curve". As long as nobody replies to that question I think that the best presentation of the phase is the one we have now.
Hi Jean-Michel,

Many thanks for the comprehensive comments. The presentation of phase (corrected or otherwise) continues to be a somewhat contentious issue, it would seem :-).

Kind regards,

David
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 11th July 2009, 08:37 AM #704 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan Jean-Michel, Regardless of how each designer may conduct his work, I think we would want to see proper correlation between a model versus measurement. This just makes the design process more smoothly integrating with other tools that might be necessary to complete a system design. __________________ Hear the real thing!
 12th July 2009, 08:32 PM #705 David_Web   diyAudio Member   Join Date: Sep 2008 It might have been asked already, but how about linear expansion for horn segments. Should be great for TH where conical expansion is usually not doable or made. Sure the difference is small with slow expansion but for sake of "compatibility" with reality At least think about it.
David McBean
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally posted by David_Web It might have been asked already, but how about linear expansion for horn segments.
Hi David_Web,

http://www.diyaudio.com/forums/showt...99#post1781099

Kind regards,

David
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GM
diyAudio Member

Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

With V23 I'm getting an error when I click on the TH Wizard of all the new designs done so far today, but not any prior ones I've tried.

GM
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Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

David McBean
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally posted by GM With V23 I'm getting an error when I click on the TH Wizard of all the new designs done so far today, but not any prior ones I've tried.
Hi GM,

Now that is a weird one! I haven't made any changes to the Tapped Horn Wizard for some time now, so I have no idea what could be causing the problem - it just doesn't make any sense. You seem to have a computer that has taken a real dislike to Hornresp, for some reason :-).

If anyone else is experiencing a similar problem, could they please let me know. Thanks.

Kind regards,

David
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www.hornresp.net

 18th July 2009, 06:08 AM #709 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Greets! Yeah, it really took me by surprise. I've done several more designs, but get the error every time I click on the TH Wizard and of course it closes the program when I click OK. I don't have any problems with designs done before yesterday though, so a real head 'scratcher' since I've done nothing out of the ordinary. Oh well, it's been a real long day, I'll uninstall/reinstall it after some rest and hopefully it will cure whatever ails it. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
 19th July 2009, 03:54 PM #710 zobsky   diyAudio Member     Join Date: Mar 2002 Location: Dallas, Tx, USA Importing / Exporting Individual designs I'm not sure if this is possible, but is there a way to export / import particular designs to a portable format? I've always thought this would be a useful feature , especially for the purpose of presenting various designs on this board for critique. Thanks __________________ "Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein

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