Electrolytic capacitors
In this type of capacitor, the dielectric (insulation) between the two plates of the capacitor is a wafer-thin layer of oxide. In crossovers, only bipolar capacitors can be used. However, they have the following disadvantages compared with metallised capacitors: 1. low electric strength 2. relatively high dielectric loss factor, which gives the capacitor an ohmic component, which causes it to heat up under high currents but this also has a negative effect on the crossover.
