5 Power amplifiers
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:
© Joris van den Heuvel 2001-2009