Filtering and energy adjustment of the loudspeaker input signal using a two-way passive crossover network. (a) On-axis sound pressure level transfer functions of the example loudspeaker’s low-frequency (LF) and high-frequency (HF) drivers without passive crossover network. (b) Crossover target curves, on-axis sound pressure level transfer functions of the example loudspeaker’s LF and HF drivers, and the total output, each filtered with passive crossover. (c) Electrical circuit diagram of the passive crossover network with outputs for LF and HF drivers.