Mid; Freq; Hi Mid; Low Mid - Mackie SR24-4-VLZ PRO Owner's Manual

Mono Stereo
channels channels
TRIM U TRIM
U
20 21
22
0 60
-20 +20
-
+15dB 45dB
AUX AUX
U U
1 1
PRE PRE
+15 +15
O O O O
U U
2 2
PRE PRE
O O +15 O O +15
U U
3 3
+15 +15
O O O O
U U
4 4
+15 +15
O O O O
U PRE U PRE
5 5
POST POST
+15 +15
O O O O
U U
6 6
POST
POST
+15 +15
O O O O
EQ EQ
U U
HI HI
12k 12k
-15 +15 -15 +15
U U
HI

MID

MID
3k
-15 +15 -15 +15
600
U

LOW

150 1.5k

FREQ

MID
800Hz
-15 +15
100 8k
U U
LOW LOW
80Hz 80Hz
-15 +15 -15 +15

LOW CUT

75 Hz
18dB/OCT
OL OL
-20 -20
L R L R
PAN PAN
20 21 22
MUTE MUTE
MUTE / MUTE / MUTE / MUTE /
SOLO SOLO SOLO SOLO
dB dB
10 10
SOLO SOLO
5 5
1 - 2 1 - 2
U U
5
5
3 - 4 3 - 4
10 10
L - R L - R
20 20
30 30
40 40
50 50
60 60
O O O O
20
EQ: (28 through 34)
The mixer has low shelving, mid
peaking and high shelving EQ. "Shelv-
ing" means that the circuitry boosts or
cuts all frequencies past the specified
frequency. For example, boosting the
LOW EQ knob boosts bass frequencies at
80Hz and below. "Peaking" means that
only a selected "hill" of frequencies sur-
rounding a center "hilltop" frequency is
affected by the EQ control.
All EQ gain controls provide up to
15dB of boost (clockwise) or cut
(counter-clockwise). They are flat (no
boost or cut) at their center detents, ef-
fectively bypassing their circuits.
Note: EQ boost is a form of level
boost. With excessive amounts, the sig-
nal may become too hot and overload
subsequent circuitry. Should this hap-
pen, either back off the EQ gain, or
repeat the SET THE LEVELS on page 8.
The following graphs show how the
frequency response changes when the
various controls are adjusted.(The
graphs are simplified for entertainment
and enlightenment purposes only).
28. HI
This control is centered at 12kHz and
above. Boost it to add sizzle and defini-
tion to sounds with high-frequency
transients, such as cymbals. Reduce it to
attenuate sibilance or to mask tape hiss.
+15
+10
+5
0
–5
–10
–15
20 100 1k 10k 20k
Hz Hz Hz Hz Hz
29. MID and 30. FREQ
The mono channels employ a semi-
parametric mid-sweep EQ. The gain is
set via MID (29), and then "aimed" at a
specific frequency, from 100Hz to 8kHz,
via FREQ (30).
+15
+10
+5
0 MID
–5
–10
–15
20 100 1k 10k 20k
Hz Hz Hz Hz Hz
FREQ
31. HI MID and 32. LOW MID
The stereo channels employ a 2-stage fixed-
frequency midrange EQ:
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
Midrange EQ is often considered the most
dynamic, because the frequencies that define
any sound are almost always found in this
range.
33. LOW
This control is centered at 80Hz and below.
This frequency represents the punch in kick
drums, bass guitar and fat synth patches.
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
34. LOW CUT
This switch (only on the mono channels)
cuts the bass frequencies below 75Hz at a rate
of 18dB per octave. Low Cut is also known as
High Pass (low cut dress=high pass rate).
To prevent muddy mixes, use low cut on ev-
HI
ery mono channel except those which carry
kick drum, bass guitar or other bass-intensive
sounds. Low cut can also help reduce the possi-
bility of feedback in live situations and it helps
to conserve amplifier power.
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
Desirable low frequencies can be boosted
whilst undesirable lower frequency stage
rumble, mic handling clunks and P-p-pops are
attenuated.
LOW MID is
centered at

LOW MID

800Hz.
1k 10k 20k
Hz Hz Hz
HI MID is

HI MID

centered at
3kHz
1k 10k 20k
Hz Hz Hz
This graph
shows various
settings of the
LOW
LOW control,
with LOW CUT
not engaged.
1k 10k 20k
Hz Hz Hz
This graph
shows various
settings of the
LOW
LOW control,
with LOW CUT
engaged.
1k 10k 20k
Hz Hz Hz