Calculates passive crossovers values needed for 6 dB, 12 dB and 18 dB/octave slopes. Design High-pass, Low-pass, 2 way, Band-pass, Narrow bandwidth Band-pass and Zobal crossovers. Linkwitz-Riley and Bessel calculations for 12dB and 24dB slopes. Chebyshev calculations for 12dB slope. Load calculations.