Live sound - FOH mixer chain

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The following is an example of a standard FOH chain:

Live sound - FOH mixer chain

FOH mixer chain

In this case as well, the input signals come from the stage splitter. This mixer's function is to create the hall's mix, and therefore the FOH engineer will have an effects rack at his disposal (as well as all the facilities available on the mixer) to manipulate the sound as he prefers and supply the final mix on the master stereo output. Once again we have a stage with a graphic equalizer (which in actual fact are two equalizers, one for the left channel, and one for the right channel) generally with 31 frequency bands. In this case we must assume that the system is high quality, and that it doesn't actually need the equalizing phase to correct its response (which should be more than good enough). The function of the two graphic equalizers is to adapt the system's response to the hall's characteristics (if, for example we were to work in a hall with a strong presence of low frequency echoes, we'd have to attenuate this band by acting upon the two graphs). Next comes the limiting phase (which isn't always present, seeing that it may introduce unwanted distortions). Finally the signal reaches an active cross-over [The crossover ] , and from here it is routed to the various amplifiers that amplify the different frequency bands. Every amplified signal reaches its assigned loudspeaker, and the sound is then diffused into the hall.








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