When powers increase, passive crossovers become very expensive, and even then, cause significant power loss. There is the point where one may decide to bi-amplify. It means that low frequencies and high frequencies are separated by an active crossover at signal level, and then each frequency range is amplified by a separate amplifier (or a stereo amplifier is employed) and separate speakers. Bi-amping is especially advantageous for subwoofer setups, because a passive subwoofer crossover requires very large and expensive inductors and capacitors.

A schematic of a bass guitar bi-amplified setup:

		high	power amp	speaker
bass	preamp/fx	crossover
		low	power amp	speaker

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