Speaker crossovers are electric filters employed in audio applications . Most of the specific loud-speakers are  not capable of spanning the entireaudio spectrum from low to very high frequencies withacceptable proportional volume level and without of distortion .For these reasons almost all hifi loudspeaker technology draw on an amalgamation of speaker drivers each of them looking after a separate frequency band . Cross overs split up the audio signals into discrete frequency bands that will be on an individual basis passed to loudspeakers fully optimized for those bands. An active crossover is different from a passive crossover due to the fact that the division of the sound signal occurs before the signal is amplified. Active crossovers come in both analog or digital varieties. Quite often digital active crossovers add in supplemental processing to the signal, as an example, equalization, delay & limiting. The function of a signal crossover is to divide the sound signal into bands. Those are then seperately treated before all of them being combined together. Some examples are noise reduction such as 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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