10.2 NOTCH FREQUENCY SELECTORS. 50Hz - 6kHz Sets the
approximate centre frequency from 50 Hz (low bass) - 6kHz (treble)
via a rotary control pot to which the "Q" Pot sets a broad or narrow
notch cut either side of the position
10.3 NOTCH FILTER SWITCHES. Two way switch determines
whether the Notch Filter is in or out. This enables you to instantly
determine whether you like the application set On / Off without
altering settings. The LED indicator illuminates blue when filter is
applied
Two way switch applies notch filter to Ch. 1 or Ch. 2 alternately
Avoid leaving switches between settings as this could short out
operation of the pre-amplifiers until moved into a positive position
10.4 NOTCH FILTERS IN OPERATION
This is a versatile, supplementary tone control on each channel
which can be used subtly at the "Sharp" or narrow end or severely
at the “Wide” or broad end. It is the most precise and effective
method for cutting highly intrusive or severely problematic sounds
such as feedback, excessive booming and body handling noise,
background rumble, honky upper mid range or muddy lower mids.
You may first try the Notch Filter on what seems to be the most
problematic frequency spectrum leaving the other EQ controls at
their centre position. Here are a few potential strategies
10.4.1 CUTTING UNWANTED BASS TONES
P. 59
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