Mackie SR24•4 Owner's Manual page 18

Layout
and Function
inputs (the inner circle marked MIC GAIN).
Proper setting of the TRIM control is essential
for good noise and headroom performance.
mix dynamic or condenser microphones, elec-
tronic keyboards or even guitar amplifier
heads, the signals connected to the channel
inputs could vary from extremely small to very
large. With the TRIM level adjusted correctly,
the Mackie input amplifier can accept a wide
range of input levels. See Setting Levels With
Solo just above, and Important Sensitivity
Adjustment Procedure! in the Introduction.
have a three-band EQ (Equalizer) plus a switch-
able LOW CUT filter.
set at its Unity Gain "U" detent, it does not
affect the signal.
available. This is a great treble control, with
the same range as the HI EQ in the Mackie
8•Bus console.
16
TRIM
2
U
10 60
+10dB -40dB
AUX
U
1
PRE
+15
O O
U
2
PRE
+15
O O
U
Since you might be using your SR24•4 to
EQ SECTION
Channels 1–20 (1–28 on the SR32•4) each
When any HI, MID or LOW EQ knob is
+15
+10
+5
0
–5
–10
–15
20 100 1k 10k
Hz Hz Hz
TRIM CONTROL
Shelving equalizers work on a very broad
range of frequencies and consequently are very
The white
"musical." In a 12kHz shelf like this section, that
knob at the top of
means that all the upper harmonics of a sound
the channel strip
are raised evenly, basically keeping their original
is the TRIM con-
musical relationship to each other. A high-
trol [8]. TRIM
frequency shelving EQ is great for putting
sets the gain
shimmer into acoustic guitar and piano tracks or
(volume level) of
sizzle into vocals and recordings of eggs frying.
the SR24•4 input
MID EQ
amplifier, and is
labeled with gain
The MID section [10] is a sweepable peak-
sensitivity mark-
ing/dipping EQ with a fixed bandwidth of 1.5
ings for both
octaves (Q=0.9). The FREQ knob sweeps the
LINE (the outer
EQ over a range from 100Hz to 8kHz, and the
circle) and MIC
MID knob selects up to 15dB of equalization.
+15
+10
+5
0
–5
–10
–15
+15
+10
+5
0
–5
–10
–15
20
Hz
HI EQ
The HI
section [9] is
a fixed 12kHz
shelving EQ
with 15dB of
20k
Hz Hz equalization
can't get along
very well with-
out high or low
EQ, but mid-
range EQ often
seems to be
the most pow-
erful. Much of
the essential
character of a
voice or in-
strument is
determined by
100 1k 10k 20k
Hz Hz Hz Hz
U
-15 +15
U
-15 +15
100 8kHz
U
-15 +15
LOW CUT
75 Hz
18dB/OCT
It's true you
EQ
HI
12k
MID
FREQ
LOW
80Hz