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26th August 2011, 08:35 PM  #1 
diyAudio Member
Join Date: Jan 2007
Location: No. Utah

Formula for CR Xo pole?
For a series capacitor between a linelevel output and linelevel input, is this the formula to compute the Xo pole?
Fc = 1/2piRC R = input Z C = series capacitor value
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James "Television is the poor man's whiskey." Russel Baker 
26th August 2011, 09:51 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, 10:00 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.
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James "Television is the poor man's whiskey." Russel Baker 
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