Mackie QUAD EQ Owner'S Manual Download Page 10

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QUAD EQ

Quad EQ

Owner’s Manual

Owner’

s Manual

Front Panel Controls

Filters

The Quad EQ has thirty Adaptive-Q filters across the

audio frequency range, for each of the four channels.
Each filter can be adjusted in level from 12 dB of boost
to 12 dB of cut. The Adaptive-Q design allows the actual
equalization applied to your signal to follow the settings
you see in the display, without the ripples and gain boost
found in many common EQs. The filter frequencies are
as follows from left to right:

8. FILTER LED ladders

Each LED ladder contains 11 bi-colored (green/red)

LEDs that show various settings of the Quad EQ. There
is one LED ladder per filter, and they all function in the
same way except for the right-most ladder (see MAS-
TER [9] below).

When setting the EQ level of each filter, the LEDs

glow red. They move above the center (0 dB) line when
applied as a boost in level, and below it when applied
as a cut. Each filter is capable of ±12 dB boost and cut,
achieved by pressing the button beneath the filter of
interest, and then turning the KNOB [19].

For real time analysis (RTA) applications, the LEDs

turn green. They fill from bottom to top to show broad-
band frequency analysis. The LEDs show the signal
levels of each filter from the current channel. If you are
using the MIC, then the LEDs show the signal levels of
each filter from the measurement microphone.

The Quad EQ can display both the EQ setting and RTA

results simultaneously, making it an extremely unique
live sound tool. The EQ settings are displayed as a single

red LED per ladder, while the RTA (green) LEDs will
actively display around the EQ setting.

9. MASTER LED Ladder

The right-most LED ladder shows the master output

level setting in red, and the master output meter in
green. It is like having a master fader and master meter
in one.

The level control setting is red, with unity (0 dB) at

the center and a range of ±12 dB. The adjustment is
made by pressing the MASTER SELECT [11] switch
below this LED ladder, and turning the KNOB [19].

The green output level metering is always in view,

showing the average signal level across the complete
audio frequency range, with 0 dB at the top, to -50 dB.

This right-most ladder is more to the right than any

other ladder, and no other ladder is more right-most
than it, being all leftwards.

10. FILTER SELECT buttons and LEDs

To adjust the level of a filter, press one of these but-

tons, and turn the KNOB [19]. The dB level (±12) ap-
pears temporarily in the DISPLAY [20] above the KNOB.
The LED above each button illuminates when that filter
is selected.

There are different options, such as grouping filters,

setting a filter to 0 dB, and setting all filters to 0 dB:

Group filter select

Press and hold a FILTER SELECT button and press
any others to create a temporary group of filters.
These can then all be adjusted at the same time us-
ing the KNOB. The filters will maintain their relative
positions during adjustment, allowing you to keep an
EQ curve the way you like, but still boost or cut the
filters. Pressing any single FILTER SELECT button
will remove the group setting.

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