PreSonus Acousti-Q - Manual (Page 9)

CONTROLS & OPERATION 2
7
position. The Level of the selected frequency can be increased (boosted) by
rotating the outer knob of the Notch lter clockwise from the twelve o’clock (0)
position. This boost can be by as much as twelve dB (+12). Care should be
exercised when boosting the instrument’s signal with the Notch lter so as to
not cause a feedback problem. The Notch lter can be effective at boosting
a decient frequency, however, the Bass control of the Equalizer section of
the ACOUSTI-Q should be the rst choice for increasing the low end of an
instrument’s voice.
Setting the Notch Filter for an Acoustic Guitar
As stated previously, the Notch lter is controlled by way of a dual concentric
potentiometer. The inner knob allows selection of a frequency from 92Hz to
494Hz and the outer knob can cut or boost the selected frequency’s level by
as much as 12dB.
Begin by turning the Frequency selector fully counter clockwise and placing the
Level control in the twelve o’clock (0) position. Press down on the lowest string
at the rst fret. Continue fretting the lowest string moving up the neck one
fret at a time until the resonant frequency is located. While keeping the note
on the guitar fretted, turn the Boost/Cut (outer control) counterclockwise about
halfway. Slowly rotate the Frequency control from the 92Hz position, clockwise,
until the feedback is reduced. Try to zero in on the feedback by very slowly
advancing the frequency controller past the point at which the feedback was
initially reduced. If the level of the feedback increases, go back to the point
where it was encountered. You have found the offending frequency and reducing
or eliminating it is now simply a matter of rotating the Level (outer control)
of the Notch lter.
2.1.3 EQUALIZER
The ACOUSTI-Q Equalizer has
two dual concentric controls. A
sweepable Mid-Range control and a
Brilliance/Bass control.
Mid-Range Controls
The dual concentric Mid-Range control has a Frequency selector (inner knob)
and a Level control (outer knob). The Frequency control is labeled FREQ and
is graduated incrementally from 250Hz (completely counter clockwise) to 5kHz
(fully clockwise). The Level can be cut 12dB (completely counter clockwise) or
0
-12 +12
1k
250 5k
0
-12 +12
LE
SS
M
O
R
E LE
SS
M
O
R
E