Butterworth 2 way 4th Order (24dB)

Change parameters to your requirements

The calculated values

Cross-over frequency 1000 Hz

C1 = 13.00 uF

C2 = 18.38 uF

C3 = 31.36 uF

C4 = 7.61 uF

L1 = 0.81 mH

L2 = 3.33 mH

L3 = 1.95 mH

L4 = 1.38 mH

the calculated values are rounded to 2 decimals

Recommended values for capacitors

C1 = 12 uF + 1 uF  parallel

C2 = 18 uF + 0.33 uF  parallel

C3 = 30 uF + 1.3 uF  parallel

C4 = 7.5 uF + 0.1 uF  parallel

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