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Active Filter: Linkwitz 24dB Lowpass

(4th order, 24 dB/octave, Lowpass)

4th order Linkwitz Lowpass

R=4.7k-10 kOhm
Ca=Cc=2*Cb
Cb=Cd=1/(2*sqr(2)*pi*Fc*R)

Units: R [Ohm], Cx [F], Fc [Hz]