fe 103 notch filter

Jhovis · 16th April 2007, 05:08 PM

I have lost a diagram I had for a notch filter. I've searched here and didn't find it either. Does anyone have a link with a diagram to making a notch filter for the fe103?

Pit Hinder · 16th April 2007, 05:16 PM

Hi Jeff,
the filter for the late and lamented RS40-1197 might be a starting point.
.25mH 3.9ohms 6.8yF

I hope this helps a bit.

Cheers,
Pit

Jhovis · 16th April 2007, 05:51 PM

Thanks Pit,
I also found this. The address is similar to your name...is this your page?: http://hometown.aol.de/hphinder/homepage/index.html

Look at the bottom of the page. I assume I run this in series off the positive speaker terminal?
Thanks,
Jeff

Cal Weldon · 16th April 2007, 06:22 PM

Jhovis,

As you probably know there are two types of notch filters, series and parallel. The parallel unit runs the notch elements in parallel but in series with the driver. This is the one Pit is most likely discussing.

The series unit runs the notch elements in series but are paralleled to the driver. This is most often used for impedance matching and is less commonly used to actually notch. He can confirm this.

EDIT: I noticed he explains this in his site and yes he is talking about a a parallel filter.

Jhovis · 16th April 2007, 06:38 PM

Thanks Cal,
Yes, I'll make the filter parallel and run it in series with the driver.

Pit Hinder · 16th April 2007, 07:02 PM

Jeff,
this is crazy! I've given up aol some five years ago and they still have that thing on their server?
The values shown on that page are for the 103Sigma which is quite a different animal - to save money, try the 1197 values first and play with the resistor. A higher value gives you a deeper notch - it's a matter of personal taste and favourite (or enforced) SPL level whether you shoot for ~linear or a slight "loudness" effect.

Cheers,
Pit

holdent · 16th April 2007, 10:43 PM

What response peak are you trying to control? As usual the Fostex published frequency response is "generous" but there seems to be a peak between 7000 to 9000 Hz. Is this the one?

16th April 2007, 05:08 PM	#1
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	fe 103 notch filter I have lost a diagram I had for a notch filter. I've searched here and didn't find it either. Does anyone have a link with a diagram to making a notch filter for the fe103? __________________ jeff

16th April 2007, 05:51 PM	#3
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Thanks Pit, I also found this. The address is similar to your name...is this your page?: http://hometown.aol.de/hphinder/homepage/index.html Look at the bottom of the page. I assume I run this in series off the positive speaker terminal? Thanks, Jeff __________________ jeff

16th April 2007, 06:22 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Jhovis, As you probably know there are two types of notch filters, series and parallel. The parallel unit runs the notch elements in parallel but in series with the driver. This is the one Pit is most likely discussing. The series unit runs the notch elements in series but are paralleled to the driver. This is most often used for impedance matching and is less commonly used to actually notch. He can confirm this. EDIT: I noticed he explains this in his site and yes he is talking about a a parallel filter. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

16th April 2007, 06:38 PM	#5
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Thanks Cal, Yes, I'll make the filter parallel and run it in series with the driver. __________________ jeff

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16th April 2007, 05:16 PM	#2
Pit Hinder diyAudio Member Join Date: Nov 2006 Location: Hannover, Germany	Hi Jeff, the filter for the late and lamented RS40-1197 might be a starting point. .25mH 3.9ohms 6.8yF I hope this helps a bit. Cheers, Pit

16th April 2007, 07:02 PM	#6
Pit Hinder diyAudio Member Join Date: Nov 2006 Location: Hannover, Germany	Jeff, this is crazy! I've given up aol some five years ago and they still have that thing on their server? The values shown on that page are for the 103Sigma which is quite a different animal - to save money, try the 1197 values first and play with the resistor. A higher value gives you a deeper notch - it's a matter of personal taste and favourite (or enforced) SPL level whether you shoot for ~linear or a slight "loudness" effect. Cheers, Pit

16th April 2007, 10:43 PM	#7
holdent diyAudio Member Join Date: Nov 2005 Location: Ontario	What response peak are you trying to control? As usual the Fostex published frequency response is "generous" but there seems to be a peak between 7000 to 9000 Hz. Is this the one?

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