Speaker cross overs are digital filtration systems used in audio functions . A lot of individual loudspeakers are  not able to spanning the fullsound range from base to very high frequencies withsatisfactory proportional volume and without of distortion .That is the reason why for the most part high fidelety speaker technology use an amalgamation of speaker drivers each of them supporting a separate frequency band . Cross-over break the sound network into different frequency bands that will be separately routed to speakers engineered for those bands. An active crossover differs from a passive crossover because the splitting of the audio signal will occur before the signal is amplified. Active crossovers come in both analog or digital versions. In many cases digital active crossovers include supplementary processing to the signal, for example, equalization, delay and limiting. The function of a signal crossover is to divide up the audio signal into bands. They are consequently seperately treated before them getting combined together again. Examples are noise reduction such as in Dolby A noise reduction; high frequency exciters; multiband distortion; multiband dynamics for example de-essing, compression, limiting; and bass enhancement. See 90Hz.com For More Information.

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