Audio crossovers are electric filter systems available in speaker applications . Nearly all single loudspeakers are  not able to dealing with the completeacoustic spectrum from lowest to very high sound frequencies withsatisfactory comparative volume level & absence of distortion .So therefore almost all hi-fi loudspeaker systems have a combination of loud-speaker drivers each one handling a distinct frequency band . Cross-over split up the acoustic signals into discrete frequency bands that are separately passed to speakers engineered for each of those sound bands. An active crossover varies from a passive crossover because the splitting of the sound signal happens before the signal is amplified. Active crossovers are offered in both analog or digital kinds. In many cases digital active crossovers encompass supplementary processing to the signal, to illustrate, equalization, delay and limiting. The job of a signal crossover is to break up the audio signal into bands. These are subsequently seperately treated prior to all of them being mixed together. A few examples are noise reduction for instance 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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