Inductor calculations

jaudio · 12th August 2006, 12:03 PM

When using a parallel notch filter, do you add the notch filter resistor to the woofer resistance, when calculating the woofer's inductor value?

Ron E · 12th August 2006, 01:55 PM

No.

The notch filter resistor really only acts at the notch frequency, below the notch, the notch inductor and it's DCR dominate, above the notch, the capacitor dominates.

I doubt the notch inductor DCR will affect crossover inductor calculations much.

The sum of the DCR's of the crossover and notch inductor will raise Qes (and Qts) and require a change in box design, though.

jaudio · 12th August 2006, 09:15 PM

Thanks for the reply

Sorry I wasnt clear. I was referring to only the resistor in the notch filter and not the dcr on the inductor in the notch filter. I think that resistor would be in series with the woofer, which would add the resistor value (4.6ohm .ei) with the woofer resistance (8 ohm). Now, do I calculate for 12.6 ohm or 8 ohms?

Ron E · 12th August 2006, 10:21 PM

I understood you quite clearly. The answer is no. The rest of my reply is FYI-perhaps an unwelcome complication....

jaudio · 12th August 2006, 10:48 PM

Quote:

Originally posted by Ron E
The rest of my reply is FYI-perhaps an unwelcome complication....

Your FYI was very welcomed. I didn’t understand it at first but I understand a little now. Well, I still don’t quite understand it but I can figure it out since I know the answer is definitely no

Thank you for answering my questions

12th August 2006, 12:03 PM	#1
jaudio diyAudio Member Join Date: Oct 2004	Inductor calculations When using a parallel notch filter, do you add the notch filter resistor to the woofer resistance, when calculating the woofer's inductor value?

12th August 2006, 01:55 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	No. The notch filter resistor really only acts at the notch frequency, below the notch, the notch inductor and it's DCR dominate, above the notch, the capacitor dominates. I doubt the notch inductor DCR will affect crossover inductor calculations much. The sum of the DCR's of the crossover and notch inductor will raise Qes (and Qts) and require a change in box design, though. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley

12th August 2006, 10:21 PM	#4
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	I understood you quite clearly. The answer is no. The rest of my reply is FYI-perhaps an unwelcome complication.... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley

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12th August 2006, 09:15 PM	#3
jaudio diyAudio Member Join Date: Oct 2004	Thanks for the reply Sorry I wasnt clear. I was referring to only the resistor in the notch filter and not the dcr on the inductor in the notch filter. I think that resistor would be in series with the woofer, which would add the resistor value (4.6ohm .ei) with the woofer resistance (8 ohm). Now, do I calculate for 12.6 ohm or 8 ohms?