How to represent a speaker for a simulator - diyAudio
 How to represent a speaker for a simulator
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 6th February 2009, 02:04 PM #1 diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast How to represent a speaker for a simulator I am using simulator, as i cannot be sitted for long time..some blood pressure problems and circulation problems forces me to be layed down, to be walking or moving but not to stay sitted for long time. But i have a question: What to use instead of a resistance to "simulate" a speaker into amplifiers output... as loads. Speakers has impedance (variable resistance because of frequency variations and impedance peaks and valleys) ... also inductance and capacitance...also speaker cables have resistance, inductance and capacitance..... so, please, suggest me the equivalent circuit to substitute the single resistance i am using. So, loads to speakers are not a simple resistance.... must be a "system" with many parts that can simulate the real thing in a better way. I think simulator analises using resistances into the output are saying nothing to me. Please, produce a hand sketch with values. Carlos __________________ Full throotle amplifier manufacturing; https://www.youtube.com/watch?v=iEXaSSlMEBg, Sample Dx Classic https://www.youtube.com/watch?v=fVvFrwl92RU
 6th February 2009, 02:13 PM #2 diyAudio Member     Join Date: Dec 2005 Location: the north We have had such testloads, with approximate L, C, R of a 'normal speaker' posted at this forum And I have asked the same question once. Of course such circuit can be used for a real dummy load as well as in Simulator. Don't ask me where is that topic __________________ lineup
 6th February 2009, 02:19 PM #3 diyAudio Member   Join Date: Jan 2008 I didn't know how detailed you want the model: there is a simple model here: An Example Calculation http://sound.westhost.com/tsp.htm The T/S model in these papers: http://www.readresearch.co.uk/html/articles.htm http://www.readresearch.co.uk/thiele..._article_1.pdf http://www.readresearch.co.uk/thiele..._article_2.pdf
 6th February 2009, 02:31 PM #4 diyAudio Member     Join Date: Dec 2006 also, if you subscribe to the LTSpice Yahoo group, they have several excellent speaker simulators on their files page __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: spammers must die
diyAudio Member

Join Date: May 2008
Location: Smoky Mountains , Tennessee
Ahh , here it is..
Attached Images
 speaker.gif (19.1 KB, 180 views)

 6th February 2009, 02:35 PM #6 diyAudio Member     Join Date: Dec 2005 Location: the north thanks, ostripper .. where do you get all those nice things __________________ lineup
 6th February 2009, 02:38 PM #7 diyAudio Member     Join Date: May 2008 Location: Smoky Mountains , Tennessee From the bottomless "pit" of my "www".. OS
 6th February 2009, 03:15 PM #8 diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast Good.... very good... thank you all folks...thanks Lineup also my thanks to dear Ostripper, dear unclejed613 and dear harman Kardon26147. Well folks.... i am simulating QUAD 303, 406, 606 and 707... and have built the 405 (not too much happy with it... very good.... maybe excelent...but was not all that great sound i was wondering.... bellow my spectations). Now i am thinking to build the 303... and i am trying to beat John Ellis (a very good guy.... a hard job to beat him) into the simulator... i could match, but could not beat...my circuit modifications compared to the 303 are different (and i have not build to listen the real thing) and i was wondering about the speaker load. Thank you very much folks. I am satisfied... thread made the job.... keep it rolling if you want..but big fat Charlie is happy and satisfied. regards, Carlos __________________ Full throotle amplifier manufacturing; https://www.youtube.com/watch?v=iEXaSSlMEBg, Sample Dx Classic https://www.youtube.com/watch?v=fVvFrwl92RU
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Join Date: Apr 2003
Here is the Stereophile article that describes the dummy load they use. I've attached an LTspice file of this circuit below as well.
Attached Files
 speaker_stereophile.zip (710 Bytes, 18 views)

diyAudio Member

Join Date: Feb 2004
Location: Recife - Brasil Northeast
Thank you andy_c

attached,

Carlos
Attached Images
 speaker 2.gif (37.8 KB, 126 views)
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