Acoustic cross-over are electric filter systems seen in sound utilizations . On the whole single loud speakers are  incapable of spanning the entireacoustic spectrum from lowest to top sound frequencies withideal proportional sound level and absence of distortion .Which means most high fidelety speaker devices utilize a blending of speaker drivers each looking after a distinct frequency band . Cross overs break the acoustic signal into discrete frequency bands which are on an individual basis routed to loudspeakers engineered for each of those sound bands. An active crossover differs from a passive crossover as the splitting of the audio signal takes place before the signal is amplified. Active crossovers can be found in both analog or digital types. Frequently digital active crossovers contain supplementary processing to the signal, as an illustration, equalization, delay & limiting. The function of a signal crossover is to actively split the audio signal into bands. They are next seperately treated before all of them getting blended together again. A few examples are noise reduction for example 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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