PreSonus DigiTUBE - Manual (Page 9)

CONTROLS & OPERATION 2
7
Mid
The dual concentric potentiometer labeled MID controls
the frequencies from 900Hz to 5kHz. The outer ring
provides boost or cut at the frequency selected by the
inner knob by plus or minus twelve decibels with the
straight-up noon position equal to zero or no boost or
cut. The inner control knob begins at 900Hz in the left
or fully counter-clockwise position and continues to 5kHz in the right or fully
clockwise position. This control behaves in the same manner as the LOW control
with the frequency widths delineated by the knob’s markings becoming wider as
the knob travels to the right or the clockwise direction.
2k
900 5k
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High
The Equalizer dual concentric control labeled HIGH
operates in the same manner as the LOW and MID
controller. The inner HIGH control knob is used to
boost or cut frequencies ranging from 3kHz to 15kHz
by as much as 12dB by adjusting the outer ring of the
controller.
80Hz Switch
The DigiTUBE equalizer section contains a switch labeled 80Hz. Engaging this
switch activates an 80Hz filter (often referred to as a rumble filter). This filter is
useful for eliminating extraneous low-end sounds from the signal being ampli-
fied. Frequencies from 80Hz and below are cut from the incoming signal. This
will eliminate low-frequency noises such as air-conditioning hum or the sounds
of nearby traffic or other vibrations that may be transmitted through the micro-
phone stand into the microphone. It can also be useful for reducing the effect of
electrical hum that may be the result of grounding problems.
EQ In
The EQ IN switch provides the ability to audition the effect that the equalizer is
having on the signal being processed. Pushing the switch to the latched position
inserts the equalizer into the signal path. Releasing the switch takes the EQ out
of the signal path. You can quickly judge the effect your efforts at adjusting the
equalization of the incoming signal are achieving and rapidly compare it to the
un-equalized signal.
5k
3k 15k
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