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F=1/[2piRC]?

Posted by Bryon (A) on August 8, 2007 at 10:55:23

In Reply to: RE: I would not run the lowthers full range posted by Retsel on August 7, 2007 at 14:30:37:

F= frequency in hz
R= resistance in ohms
C= capacitance in farads

I did some online research and found this formula to determine the size of capacitor to use as a high pass filter in the Paraglows.

I was surprised at the values I ended up and as I am not overly competent in these matters, thought I'd appeal to those who are.

The DX3's are 16 ohm drivers but actual resistance is more like 10 ohms. Which value should I use for R? Can I ignore the supposedly small level of resistance that the output RCA jacks and speaker cable add?

If I want to aim at a cutoff 200 hz and I use 16 ohms, the capacitor value works out to .202uf so I can parallel a couple of .10 uf caps to get there.

If I use the actual resistance of 10 ohms, the capacitor should be in the neighbourhood of a .33 uf cap.

Is this the right formula to use for this purpose? Is my math even close to being correct [it's been nearly 40 years]. Am I missing anything obvious [or not so obvious?]

thanks again for your input

Bryon

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