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Zobel calculation for woofers in series
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Re: Zobel calculation for woofers in series
Originally posted by Hackomatic View PostMy calculation is more like 9.3 uF for the cap.nothing can stop me now
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Re: Zobel calculation for woofers in series
Originally posted by brianpowers27 View PostI used the following calculator for the zobel. Is the reason my calc came out different due to the calculator or does it have to do with the configuration fo the drivers?
Not sure what you used . . I used this one . . .
http://diyaudioprojects.com/Technical/SpeakerZobel/Dave H
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Re: Zobel calculation for woofers in series
Originally posted by brianpowers27 View PostI just realized what I missed. In order to get the 9.2 I needed to multiply the re * 1.25.
Question: Can individual resistors be added together in series to get the desired resistance? EG: 7.5 + 1.2 = 8.7
Is the same true for capacitors?
A better way to arrive at Zobel values, is to use the woofers' actual impedance profiles in ANY kind of XO simulator. You can vary the resistor and cap values and "see" how and where the rising impedance gets flattened (even though Zobel component values are not "critical", i.e.  you can vary their values by a large margin and still have a considerable effect on the otherwise continually rising impedance profile).
What drivers are you using?
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Re: Zobel calculation for woofers in series
I have 2 polk audio woofers that my friend donated to me. I am working with Jeff Bagby's passive crossover designer for the first time and am not entirely sure what I am doing.
I ordered some passive crossover components to design a 3k 4th order LR filter based upon an impedance of 8.35(per the zobel). Does this seem correct?
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Re: Zobel calculation for woofers in series
Originally posted by brianpowers27 View PostWhoah! I just modeled the crossover in the PCD. The zobel values it gives for 2 woofers wired in series are dramatically different. I used the same values. re 3.45 le .345. WHich one is right?
Chris
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Re: Zobel calculation for woofers in series
Thank you for your answer. I do not have any impedance testing equipment. I was surprised when I used the PCD and it calculated zobel values of 1.87uf and 20ohms. I expected the calculation to produce a slight variance but that is way out of the ballpark.
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