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Old 6th February 2009, 02:04 PM   #1
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Default 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
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Old 6th February 2009, 02:13 PM   #2
lineup is offline lineup  Sweden
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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
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Old 6th February 2009, 02:19 PM   #3
HK26147 is offline HK26147  United States
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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
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Old 6th February 2009, 02:31 PM   #4
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also, if you subscribe to the LTSpice Yahoo group, they have several excellent speaker simulators on their files page
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Old 6th February 2009, 02:32 PM   #5
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Ahh , here it is..
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File Type: gif speaker.gif (19.1 KB, 177 views)
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Old 6th February 2009, 02:35 PM   #6
lineup is offline lineup  Sweden
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thanks, ostripper
.. where do you get all those nice things
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Old 6th February 2009, 02:38 PM   #7
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From the bottomless "pit" of my "www"..
OS
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Old 6th February 2009, 03:15 PM   #8
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Default 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
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Old 6th February 2009, 03:41 PM   #9
andy_c is offline andy_c  United States
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Here is the Stereophile article that describes the dummy load they use. I've attached an LTspice file of this circuit below as well.
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File Type: zip speaker_stereophile.zip (710 Bytes, 18 views)
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Old 6th February 2009, 03:57 PM   #10
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Default Thank you andy_c


attached,

Carlos
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File Type: gif speaker 2.gif (37.8 KB, 124 views)
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