Speaker crossovers are used in a variety of situations, in which multiple speaker drivers work together to produce a full-range audio signal.
Many sound systems contain multiple speakers. Based on its size, shape, and design, each speaker is responsible for accurately reproducing a specific range, or band, of frequencies. Using a crossover allows control over which frequencies are sent to which speakers, so that all speakers in the system work together to achieve the best possible sound quality.
Price is for the pair