Softube AAX DSP, User Manual, Page: 130 / 182

130 | TUBE-TECH PE 1C “PULTEC” EQUALIZER
User Interface
The user interface of the PE 1C, or of a Pultec for
that matter, can be confusing if you haven’t used
a Pultec before. First you have a low frequency
section where you select the frequency with one
knob, and boost and attenuate frequencies with two
different knobs.
The high frequency section is made up of two
subsections, the boost and the attenuation section.
If you want to boost high frequencies, you select
the frequency with the High Frequency knob, the
width or “Q” of the bell filter with the Bandwidth
knob, and then the amount of boosting with the
Boost knob. You’ll get a bell shaped boost filter for
mid to high frequencies.
But for cutting high frequencies you only get three
frequency, choices selectable with the Atten Sel
knob. The amount of high frequency attenuation is
dialed in with the Atten knob. This section gives
you a high shelving type filter.
In addition to this you get an Output Gain control.
It isn’t included in the original hardware, but we
thought it might be useful in a plug-in.
Low Frequency Section
Boost
The Boost knob goes from
0 to 14 dB and controls a
low shelf filter with a cut-
off frequency that is actually
a little lower than the ones
that are printed on the panel.
This gives the unit a unique
frequency response when com-
bined the the Atten setting.
Atten
The Atten knob will attenuate
the signal 0 to -18 dB using a
low shelf filter.
Low Frequency
Sets the cut-off frequency for
the low frequency Boost and
Atten controls. The frequency
settings are 20 Hz, 30 Hz, 60
Hz and 100 Hz.
By increas-
ing both the
Boost (blue
curve) and
Atten (black
curve) knobs
at the same
time, you’ll get the very Pultec specific sound (red curve),
sometimes referred to as the “
Low End Trick ”, which is
commonly used for equalizing bass drum. Tube-Tech has
some nice instruction videos about this on their web site.
High Frequency Section
Boost
Controls the gain for a boost
peak filter that goes from 0 to
18 dB for sharp bandwidth
and 0 to 10 dB for broad
bandwidth.
Bandwidth
Sets the width, or Q, of the
Boost peak filter. Goes from
SHARP to BROAD.