Audio crossovers are electric filters included in sound functions . A large number of specific loud speakers are  unable to addressing the totalacoustic range from low to very high sound frequencies withappropriate relative volume & without of distortion .That is why the majority high fidelety loudspeaker systems make use of a mix of loud speaker drivers each handling a different frequency band . Cross overs split up the sound signal into discrete frequency bands that will be separately delivered to speakers optimized for each of those bands. An active crossover varies from a passive crossover due to the fact that the separation of the audio signal will occur before the signal is amplified. Active crossovers are offered in either analog or digital designs. Generally digital active crossovers can include extra processing to the signal, for instance, equalization, delay & limiting. The job of a signal crossover is to split the audio signal into bands. They are next seperately refined leading up to them getting combined together. Examples are noise reduction for instance in Dolby A noise reduction; high frequency exciters; multiband distortion; multiband dynamics such as de-essing, compression, limiting; and bass enhancement. See 90Hz.com For More Information.

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