2 way crossover

Butterworth 3rd order 2-way all-pass and constant-power crossover.
 Desired cross-over frequency   Hz
Tweeter's rated impedance  ohms
Woofer's rated impedance  ohms
 
C 1   uF
C 2   uF
L 1   mH

L 2   mH
L 3   mH
C 3   uF
2 way X-over