Sound cross overs are electronic filter systems present in audio functions . Lots of individual loudspeakers are  not able to covering the totaldigital spectrum from base to high sound frequencies withideal comparative sound level & absence of distortion .On this account the majority hi-fi loudspeaker systems have a mix of loudspeaker drivers each of them handling an individual frequency band . Cross-over split the audio signals into different frequency bands which are individually routed to speakers optimized for each of those bands. An active crossover differs from a passive crossover simply because the separation of the audio signal occurs before the signal is amplified. Active crossovers are available in both analog or digital kinds. Frequently digital active crossovers add extra processing to the signal, for example, equalization, delay and limiting. The job of a signal crossover is to actively split the sound signal into bands. Those are subsequently seperately processed prior to them being integrated all 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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