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Old 26th July 2007, 07:03 PM   #1
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Default Qts and seriese resistance

I need the formulia to calculate the change in QTS caused by
adding seriese resistance. I had a link to an online program
that did this but have lost it.

thanks
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Old 26th July 2007, 07:47 PM   #2
Svante is offline Svante  Sweden
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Qes=2*pi*fs*Mms / (Bl^2/(Re+Rs))

Qts=1/(1/Qms+1/Qes)

Hope I got it right...

You don't need all the parameters, it is sufficient to realize that Qes increases by a factor (Rs+Re)/Re when Rs is connected.
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Old 26th July 2007, 07:52 PM   #3
dwferg is offline dwferg  New Zealand
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Try this link

http://www.lautsprechershop.de/tools..._closed_en.htm

Denis
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Old 26th July 2007, 08:17 PM   #4
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Thanks that helped a bunch.
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