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Impedance correction for old Fe103 (zobel)
Impedance correction for old Fe103 (zobel)
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Old 20th March 2007, 12:03 PM   #1
TKsys is offline TKsys  Germany
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Question Impedance correction for old Fe103 (zobel)

Hi Folks,

I'm looking for a zobel network to compensate the rising impedance of my old Fe103 (without "e"). Has anyone values for C an R for me?

I use the driver with my wimpy tube amp and without compensation the treble is way to prominent.

BTW: search function got no answer for me.

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Old 20th March 2007, 05:47 PM   #2
gmilitano is offline gmilitano  Canada
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Location: Winnipeg, Manitoba
Here are most of the tools and information you will need:


Calculator (.XLS):

FE103 Datasheet:

Unfortunately, the datasheet does not give Le, which you will require to calculate the Zobel.

Perhaps someone who has a FE103 can offer up the inductance.

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Old 20th March 2007, 06:09 PM   #3
EC8010 is offline EC8010  United Kingdom
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10R in series with 3u53 works for the FE103E. That should be a good starting point for the old FE103.
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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