It is possible to further improve the isolation between bass and treble signals by dedicating an amplifier to each frequency range and running separate speaker cabling directly to the driver - with no need of a crossover.  This method of powering the drivers is called Bi or Tri amping dependant on the number of amps used.

In an extreme case it is possible to provide an amplifier for each driver in a speaker, and in a 7.1 surround sound system, where each speaker had say three drivers, you would require 22 amplifiers!  21 for the speaker drivers and one for the subwoofer, in these systems the amps usually sit with the speakers which are matched with each other and the signals are fed from the processor to the amps in ultra high quality balanced audio cable.

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