Impedance correction for old Fe103 (zobel)

TKsys · 20th March 2007, 12:03 PM

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.

Cheers,
TKsys

gmilitano · 20th March 2007, 05:47 PM

Here are most of the tools and information you will need:

Background:
http://www.quarter-wave.com/General/BSC_Variable.pdf

Calculator (.XLS):
http://www.quarter-wave.com/General/BSC_Calculator.xls

FE103 Datasheet:
http://www.fostexinternational.com/d...f/fe103rev.pdf

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.

Cheers,
Gio.

EC8010 · 20th March 2007, 06:09 PM

10R in series with 3u53 works for the FE103E. That should be a good starting point for the old FE103.

20th March 2007, 12:03 PM	#1
TKsys diyAudio Member Join Date: Aug 2003 Location: NRW	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. Cheers, TKsys

20th March 2007, 05:47 PM	#2
gmilitano diyAudio Member Join Date: Apr 2004 Location: Winnipeg, Manitoba	Here are most of the tools and information you will need: Background: http://www.quarter-wave.com/General/BSC_Variable.pdf Calculator (.XLS): http://www.quarter-wave.com/General/BSC_Calculator.xls FE103 Datasheet: http://www.fostexinternational.com/d...f/fe103rev.pdf 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. Cheers, Gio. __________________ DIY Audio Projects [ 10" DIY Subwoofer \| FE127E Sealed Bipole \| [ LM3886 Chip Amp / Gainclone \| K-12M Tube Amp Kit ]

20th March 2007, 06:09 PM	#3
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	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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