Audio cross-over are electrical filter systems available in audio applications . As a rule single loud-speakers are  incapable of addressing the wholespeaker spectrum from very low to very high sound frequencies withtolerable relative volume level & without of distortion .For this reason almost all hi-fi loudspeaker systems utilize a mix of speaker drivers each one supporting a distinct frequency band . Crossovers break the audio network into discrete frequency bands that are individually passed to loudspeakers engineered for those bands. An active crossover is different from a passive crossover simply because the splitting of the audio signal will occur before the signal is amplified. Active crossovers are available in either analog or digital versions. In many cases digital active crossovers feature extra processing to the signal, for example, equalization, delay & limiting. The job of a signal crossover is to actively divide up the audio signal into bands. These are after that seperately refined prior to all of them getting combined all together. Examples are noise reduction for instance in Dolby A noise reduction; high frequency exciters; multiband distortion; multiband dynamics for instance de-essing, compression, limiting; and bass enhancement. See 90Hz.com For More Information.

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