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Using the GEQ
Live use (MON)
Monitors used on stage often need equalisation to remove any peaks in their frequency
response in order to prevent feedback from on-stage microphones where those
frequencies exceed the maximum gain before feedback level. Further equalisation may
be required to remove similar peaks from the characteristics of the microphones in use.
A monitor engineer may use an RTA to detect these peaks but, more often than not,
monitor engineers have a developed sense of hearing that enables them to remove
these frequencies by ear. The GEQ's 31 bands allow a majority of feedback to be
removed from the monitors. High and low pass filters are provided that can be used to
remove high frequency feedback and bass rumble or over-excursion of bass drivers. It
may also be undesirable to have large amounts of bass in the on-stage monitors. In
vocal monitors, bass does not assist projection of vocals and can make the stage sound
unbearable, hence, the bass element can be rolled off at the desired frequency. The
fundamentals of vocals are transmitted in a narrow audible range and will appear
unaffected.
Bypassing the EQ
It may be desirable to hear the effect of the graphic equaliser settings, for example,
during a sound check. To do this, press the EQ in/out switch so that it is set to out (the
red out LED is illuminated); this bypasses the EQ (and gain) settings of the GEQ,
allowing the user to hear the original audio without adjusting any fader or control.
Placing the fader of any band at the extreme upwards position will apply either 6dB or
12dB gain (depending upon the RANGE switch's setting) to frequencies in that band.
Placing the fader of any band at the extreme downwards position will apply either 6dB
or 12dB of attenuation (depending upon the RANGE switch's setting) to the frequencies
in that band.
XL8 Control Centre
Operator Manual
217
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