It calculates the components values of a low pass filter for
a passive audio crossovers.
Useful for two-way (or more) speakers or with separated subwoofer, the low pass is the way which supply the transducer for the reproduction of low frequency (woofer or subwoofer).
F - Cutoff frequency:
Nominal impedance of the transducer:
It sees also : Common information for components of a cross-over.