The mixer is split into two sections. The Inputs receive, match
and process individual source signals, and distributes them at
precise mix levels to a choice of Monitor Outputs. The Mas-
ter
section provides monitoring of the audio signal at many
points in the mixer, either on headphones or meters and pro-
vides additional master control of talkback functions.
The Equaliser controls are the most flexible and potentially
destructive feature of the mixer. They have a similar effect on
the frequency response of the input channel as the tone con-
trols on a hi-fi system, but with much greater precision, and
allow particular characteristics of the input signal to be em-
phasised or reduced. It is very important that you become
familiar with the effect each control has on the sound and this
is best achieved by spending time listening to the effect of each
control on a well-known track played through the mixer.
Phase Reversal
enables the operator to reverse the polarity of
the signal entering the mixer, as a convenient way of checking
for incorrect wiring or problems with microphone placement.
The Monitor Sends provide a way of routing the input sig-
nals to a number of outputs, to create individual mixes for
artists foldback or additional speaker outputs.
Pre-Fade-Listen(PFL)
allows you to monitor the signal at
many points in the mixer. Pressing any PFL switch places the
signal at that particular point onto the headphones and the
PFL meter, to check the quality of the signal or to pin-point
problems. Using PFL will not affect the signals on the moni-
tor outputs.
Each input channel and all outputs have an Insert ‘A’ gauge
jack socket, which is a break point in the signal path. It allows
the signal to be taken out of the mixer, through an external
piece of equipment and then back into the mixer directly after
its original exit point. The Insert point is normally bypassed
by the ‘A’ gauge jack contacts, and is only brought into opera-
tion when a plug is inserted. Typical uses would include
Effects Processors, Limiters, additional Equalisers or Delay
units.
The terms PRE and POST are often used in the context of In-
serts, Equalisers and Channel Sends, and describe whether
that facility is placed before (Pre) or after (Post) another par-
ticular section. This is explained further in the detailed
description of facilities.
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