Consideration of the electroacoustic behavior of common loudspeaker drivers leads to the general crossover network design requirement of constant total voltage transfer. Conventional passive networks satisfy this requirement only if the cutoff slopes are limited to 6 dB per octave. Active crossover networks with steeper cutoff slopes can also be designed to meet this requirement, but these networks do not provide a rapid transition between drivers. Regardless of the network chosen, the drivers used must have useful frequency ranges which overlap by about four octaves.
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