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Soundcraft EFX/EPM User Guide Issue 1210
• Listen carefully for the characteristic sound of “feedback”. If you
cannot achieve satisfactory input level setting without feedback,
check microphone and speaker placement and repeat the exercise.
If feedback persists, it may be necessary to use a Graphic Equaliser
to reduce the system response at particular resonant frequencies.
Note:
The initial settings should only be regarded as a starting point for your mix.
It is important to remember that many factors affect the sound during a
live performance, for instance the size of the audience!
You are now ready to start building the mix and this should be done pro-
gressively, listening carefully for each component in the mix and watching
the meters for any hint of overload. If this occurs, back off the appropriate
Channel Fader slightly until the level is out of the red segments, or adjust
the Master Faders.
Remember that the mixer is a mixer, not an amplier. Increasing the
overall level is the job of the amplier, and if it is impossible to provide
adequate level, it is probable that the amplier is too small for the ap-
plication. Choose your amplier carefully, and do not try to compensate
for lack of power by using the mixer to increase output level.
Note:
The level of any source signal in the nal output is affected by many fac-
tors, principally the Input Gain control, Channel Fader and Mix Faders. You
should try to use only as much microphone gain as required to achieve a
good balance between signals, with the faders set as described above.
If the input gain is set too high, the channel fader will need to be pulled
down too far in compensation to leave enough travel for successful mixing
and there is a greater risk of feedback because small fader movements will
have a very signicant effect on output level. Also there will be a chance
of distortion as the signal overloads the channel and causes clipping.
If the gain is set too low, you will not nd enough gain on the faders to
bring the signal up to an adequate level, and backgound hiss will be
more noticeable.
This is illustrated below: