Electrical device composed of coils of wire (inductors) and electrical capacitors, that separates audio frequency bands by filtering action and routes them to different places (such as a woofer and tweeter). The frequency of the crossovers action is determined by the value of the electronic components inside, and by the loudspeaker drivers impedance in ohms, which implies that replacing a 16-ohm driver in a particular system with an 8-ohm driver will change the crossover frequency. In such a case, the frequency will rise an octave and the shape of the crossover frequency response slopes will be distorted.