Formula for CR Xo pole? - diyAudio
 Formula for CR Xo pole?
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 26th August 2011, 07:35 PM #1 diyAudio Member   Join Date: Jan 2007 Location: No. Utah Formula for CR Xo pole? For a series capacitor between a line-level output and line-level input, is this the formula to compute the Xo pole? Fc = 1/2piRC R = input Z C = series capacitor value __________________ James "Television is the poor man's whiskey." Russel Baker
 26th August 2011, 08:51 PM #2 diyAudio Member   Join Date: May 2007 Not sure what you mean by Xo. The formula you give is approximately correct for the LF rolloff point. The full value is f = 1/ (2 pi (R1+R2) C ) where R1 is output impedance (or previous stage), R2 is input impedance (of next stage). As R1 is usually much smaller than R2, and capacitors often have 10% or 20% tolerance, the simpler formula is usually close enough.
 26th August 2011, 09:00 PM #3 diyAudio Member   Join Date: Jan 2007 Location: No. Utah Xo, crossover, sorry! Your math makes much more sense than mine. All I need now is the output impedance of one of the source components. Thanks very much for your kind reply. __________________ James "Television is the poor man's whiskey." Russel Baker

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