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The calculation of serial-networks succeed very easy if the impedancecurve of the loudspeaker or driver is measured.

 fs = driver or loudspeaker resonant frequency [ Hz] R = target resistant (normaly the Re value of the driver [ ohms ] Zmax = Impedance maximum [ ohms ] Zf1/2 = calculated average from Zmax and R [ ohms ] f1, f2 = frequency with the impedance of Zf1/2 [ Hz ] Q = Quality of then impedance peak at fs

All yellow field are required!
fs =  Hz
R (target) =  ohms
Zmax =  ohms
Zf1/2  ohms
Enter f1 frequency below fs at calculated impedance
f1 =  ohms  at   Hz
Enter f2 frequency above fs at calculated impedance
f2 =  ohms  at   Hz
Calculated fs of f1 and f2 =  Hz
Q of Resonance peak =

 Calculate values R ohms L mH C uF