SoundCraft SPIRIT FOLIO User Manual page 3

The final MIX OUTPUT is taken from here to a suitable power
amplifier and loudspeakers or to record the mix to a tape machine.
You can listen to the signal on loudspeakers by taking the signal
from the MONITOR OUTPUTS via a suitable power amplifier.
The CHANNEL FADER sets the level of the channel
signal which is fed to the Master Section and adjusts
the sound BALANCE between the different sources.
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The MASTER FADERS set the level of the
combined signal from all of the input channels
going to the amps and speakers.