Hi Eq Knobs; Mid Eq Knobs; Mid Freq Knobs; Low Eq Knobs - Mackie ProFXv3 Series Owner's Manual

The other green curves represent in-between
positions of the compressor knob, with higher
thresholds before compression begins.
Outboard compressors often have controls such as
compression ratio, threshold, soft knee/hard knee,
attack time, and release time. These last two affect how
quickly the compressor kicks in when the input exceeds
the threshold, and how quickly it is released after it
drops below the threshold. In this compressor, these
parameters are specially chosen to give you the best
overall performance.
Adjust the threshold carefully, so your dynamic range
is still lovely, without distortion or overload during the
performance. Run through a few practice screams and
high-notes, and adjust the compression as required.
Channel Equalization (EQ)
All ProFXv3 mixers – except for the ProFX6v3 – have
3-band EQ with shelving hi, peaking mid with adjustable
mid frequency [ProFX16v3, ProFX22v3, ProFX30v3]
and shelving low.
The ProFX6v3 has 2-band EQ: shelving hi
and shelving low.
Shelving means that the circuitry boosts or cuts all
frequencies past the specified frequency. For example,
the low EQ boosts bass frequencies below 80 Hz and
continuing down to the lowest note you never heard.
Peaking means that certain frequencies form a "hill"
around the center frequency.
With too much EQ, you can really upset
things. We've designed a lot of boost
and cut into each equalizer circuit because
we know that everyone will occasionally
need that. But if you max the EQ on every channel, you'll
get mix mush. Equalize subtly and use the left sides
of the knobs (cut), as well as the right (boost).
If you find yourself repeatedly using a lot of boost
or cut, consider altering the sound source, such
as placing a mic differently, trying a different kind
of mic, a different vocalist, changing the strings,
or gargling.
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15. Hi EQ Knobs

The hi EQ provides up
to 15 dB of boost or cut above
12 kHz, and it is also flat
(no boost or cut) at the
detent. Use it to add sizzle
to cymbals, an overall sense
of transparency, or an edge
to keyboards, vocals, guitar
and bacon frying. Turn it down
a little to reduce sibilance
or to mask tape hiss.

16. Mid EQ Knobs

17. Freq Knobs
[ProFX16v3, ProFX22v3, ProFX30v3]
The ProFX16v3, ProFX22v3
and ProFX30v3 mixers employ
a semi-parametric mid-sweep
EQ. The gain (up to 15 dB
of boost or cut) is set via
the mid EQ, and then "aimed"
at a specific frequency, from
100 Hz to 8 kHz, via the freq
control.
18. Mid EQ Knobs
Short for "midrange," this
knob provides up to 15 dB
of boost or cut, centered
at 2.5 kHz, also flat
at the center detent.
Midrange 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.

19. Low EQ Knobs

The low EQ provides up
to 15 dB of boost or cut below
80 Hz. The circuit is flat
at the center detent position.
This frequency represents
the punch in bass drums,
bass guitar, fat synth patches,
and some really serious male
singers who eat raw beef
for breakfast.
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Owner's Manual
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