Hi Eq; Mid Eq; Low Eq; Aux Mon - Mackie ProFX12 Owner's Manual

Another way to consider low cut's function is that it
actually adds flexibility during live performances. With
the addition of low cut, you may safely use low EQ on
benefit voices. Trouble is, adding low EQ also boosts
stage rumble, mic handling clunks and breath pops.
Applying low cut removes all those problems so you
can add low EQ without blowing the subwoofers.
3-BAND EQ
The ProFX mixer has 3-band equalization at carefully
that the circuitry boosts or cuts all frequencies past the
specified frequency. For example, rotating the low EQ
continuing down to the lowest note you never heard.
"Peaking" means that certain frequencies form a "hill"
the mid EQ.
The following graphs of frequency vs. signal level
show the approximate overall effect of EQ adjustment
on the frequency range.

22. HI EQ

This control gives you
(no boost or cut) at the
detent. Use it to add sizzle
to cymbals, and an overall
sense of transparency, or
edge to keyboards, vocals,
guitar and bacon frying. Turn
it down a little to reduce sibilance, or to hide tape hiss.

23. MID EQ

Short for "midrange,"
of boost or cut, centered at
EQ is often thought of as
the most dynamic, because
the frequencies that define
any particular sound are almost always found in this
range. You can create many interesting and useful EQ
changes by turning this knob down as well as up.
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Hi EQ
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Mid EQ

24. LOW EQ

This control gives you up
the center detent position.
This frequency represents
the punch in bass drums,
bass guitar, fat synth
patches, and some really
serious male singers.
Used in conjunction with
the low cut [21] switch,
you can boost the low EQ
without injecting a ton of
subsonic debris into the
mix.
MODERATION DURING EQ
With EQ, things may be upset royally. We've
designed a lot of boost and cut into each equalizer
circuit, because we know everyone will occasionally
need that. But if the EQs are maxed on every
channel, the resulting mix is mush. Equalize subtly
and use the left sides of the knobs (cut), as well as
engineers ever use more than about 3 dB of EQ. If
more than that is necessary, there's usually a better
way to get it, such as placing a mic differently (or
using a different kind of mic entirely).

25. AUX MON

Hz
These knobs tap a portion of each channel's signal
to set up a nice monitor mix feeding stage monitors,
independent of the main mix. Adjust these controls on
each channel until the band is happy with the stage
monitor mix.
The aux mon feed from hybrid and stereo channels is
a mono sum of the left and right sides of these channels.
The controls are off when turned fully down, deliver
unity gain at the center detent, and can provide up to
The channel fader [30], pan [27] and mute [29] do
Hz
not affect the monitor output, but the other channel
controls will. (The aux mon is pre-fader.)
The monitor signal from the monitor output jack [12]
is the sum (mix) of all the channels whose aux mon
control is set to more than minimum. The overall
output level may be adjusted with the monitor fader
if the main mix/mon switch [37] is pressed in.
Internal FX may also be added to the monitor mix
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Low EQ
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Low EQ with Low Cut
Owner's Manual
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