5 Power amplifiers

5.12 Bi-amping

When powers increase, passive crossovers 6.6 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

© Joris van den Heuvel 2001-2009