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Proportional-Q filter response
Figure 10: GEQ response full boost and cut
In addition to the graphic equaliser section, the GEQ also provides sweepable high-pass
and low-pass filters and two overlapping sweepable notch filters per channel. The
sweepable high- and low-pass filters can be used to enhance the intelligibility of wedge
monitors by cutting out extraneous low and high frequency noise, and therefore
allowing higher sound pressure levels (SPLs) to be used. The two notch filters further
enhance the XL8 Control Centre's ability to precisely tune-out problem frequencies.
The response of the notch filters was selected after careful listening to allow feedback to
be eliminated quickly, but at the same time to be unobtrusive when in use. The
high-pass, low-pass and notch filters all have on/off bypass switching, the status of
which is shown on the GEQ's front panel display on the GUI screen. So for example, if
there is particular frequency where a performer's acoustic guitar causes feedback, one
of the notch filters can be used to cut that frequency, and switched out when not
needed whilst still left in position for later in the set when the same instrument may be
used again.
XL8 Control Centre
Operator Manual
225
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