Mackie TT24 Quick Start Manual - 6.5 Six-Band Equalizer
39
Owner’s Manual
Owner’
s Manual
HPF Freq
The
HPF FREQ
field displays the value of the HPF set
from the V-POT CONTROL area.
Q (Bandwidth)
The
Q
control adjusts the
width
of a parametric filter
band and allows a wide or narrow boost and cut.
Q
is
measured from the half-power points of the filter on
both sides and is adjustable in the range 0.1–2.0 octaves
in scaled steps.
NOTE:
Bandwidth and Q are often used
as synonyms but are a source of frequent
confusion because their values are inversely
related. As the bandwidth widens and
increases in value, the Q value decreases.
6.5 Six-Band Equalizer
Figure 6-13 6-BAND EQ
The Master LR and C/Mono outputs can each access
a six-band EQ comprised of a four-band EQ and two
kill
filters
.
6.5.1 Four-Band EQ
Bands 1–4 are identical to the four-band EQ (page
38), except bands 1 and 4 are set to low- and high-shelf
filters, respectively.
6.5.2 Kill Filters
Kill filters are specialized parametric EQ bands
designed to eliminate feedback at a specific frequency
without using up an entire EQ filter. Bands 5 and 6
control the kill filter frequency. The default frequency of
both kill filters is 1 kHz.
Push the bottom-left and right QuickMix knobs to
cycle through the
four kill filter states
shown in Table 6-2.
Each state increases in gain reduction and decreases
(narrows) the bandwidth. The filters default to the
off
setting. Pressing and holding
CTRL
while adjusting the
kill filter QuickMix knob resets the kill filter to the off
position. The kill filter setting is displayed beneath its
frequency field.
Table 6-2 Kill Filter States
Off State 1 State 2 State 3
Gain Reduction (dB)
0
6
12
18
Bandwidth (octaves)
N/A
1/10
1/20
1/30
6.6 31-Band Equalizer
Figure 6-14 31-BAND EQ
The Master LR and C/Mono outputs can each access a
31-band Graphic EQ. Each 31-band graphic EQ has (31)
1/3 octave, ISO centered, constant-Q filters with a range of
±12 dB. An EQ in/out toggle is available for bypassing and
A/B listening of EQ settings. The LCD also offers an 8-band
view for greater visibility of filters on the LCD screen.
To access the 31-band GEQs via the LCD screen,
simply press the SELECT button of the main fader and
select FAT in the QuickMix section. The Fat screen will
show the three GEQs in the insert points at the bottom
of the screen. Press the Insert Edit button to display
the 31-band GEQ editing screen. The EQ filters are
edited in the QuickMix section through the use of the
12 rotary encoder/pushbuttons. The bottom row of four
use the push button to select the group of eight filters
to be edited and the two top rows of four use the rotary
encoders to change the boost/cut level.
The TT control application allows for mouse control of
the filters.