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43Soundcraft MFXi MPMi User Guide Issue 1210
• Repeat this procedure on other channels as required. As more channels
are added to the mix, the meters may move into the red section. Adjust the
overall level using the Master Faders if necessary.
• 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 progressively,
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 application. 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 factors, prin-
cipally 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: