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Active Filter: Linkwitz 24dB Highpass

(4st order, 24 dB/octave, Highpass)

4th order Linkwitz Highpass

C=4.7n-10nF
Ra=Rc=1/(2*sqr(2)*pi*Fc*C)
Rb=Rd=2Ra

Units: Rx [Ohm], C [F], Fc [Hz]