Back when I was doing stereo installs, Bi & tri-wiring was used with multiple amps to the drivers, but the crossover was removed from the speaker & an electronic crossover was put in before the amps. This allowed the use of an powerful amp for the lower notes, while using a clean, low power amp for the mids & highs. It was said that the mid/highs could travel easily over a clean circuit without interference from the bass overloading the wires etc.