Master Output Section - Mackie LM-3204 Owner's Manual

EQ
In keeping with the stereo theme of this entire
mixer, the engineers at Mackie have decided to
provide stereo equalization as well. Just like the
stereo Gain control, the EQ knobs have both left
and right EQ sections ganged on a single shaft.
The LM-3204 EQ has three sections, each
with a fixed knee or center frequency and
bandwidth. Frequency curves are shown below.
+15
+10
+5
0
–5
–10
–15
20 100 1k
Hz Hz Hz
LM-3204 Lo shelving EQ 15dB boost/cut.
+15
+10
+5
0
–5
–10
–15
20 100 1k
Hz Hz Hz
LM-3204 Mid peaking EQ 12dB boost/cut.
+15
+10
+5
0
–5
–10
–15
20 100 1k
Hz Hz
LM-3204 Hi shelving EQ 15dB boost/cut.
The low-frequency equalizer
ing EQ with the knee of the shelf set at 80 Hz.
The Lo section offers a swing of 15dB.
The mid-frequency EQ
featuring a bell-shaped peak/dip curve cen-
tered at 2.5 kHz with a smooth-sounding
2-octave bandwidth. The Mid section can cut
or boost over a range of 12dB.
The high-frequency equalizer
ing EQ with the knee of the shelf set at 12
kHz. Like the Lo section, the Hi section offers
a swing of 15dB at a very useful frequency.
When any of the EQ knobs are set at their
"Unity" detents, that section is effectively out
of the circuit.
iary sends from each input module. Two sets
of sends per module can be selected at any
one time. The Shift switch
choose either sends 1 and 2, or sends 3 and 4
on any channel strip.
the Shift button, are true stereo sends with
left and right channels maintained separately
throughout the auxiliary send circuitry.
by the Shift switch, are mono sends. Within
each channel strip, the left and right input
signals are combined into a mono sum for
sends 2 and 4, which appear at their output
jacks as monaural signals.
10k 20k
Hz Hz
control, post-EQ, post-Mute switch. Unfortu-
nately, due to the incredibly dense surface
mount circuitry inside this beast, modifica-
tions are not possible.
tent at the top of its travel, and, like the rest
of the mixer, will deliver a "level in = level
out" signal at the send outputs when set to
"U." Setting the aux send controls fully clock-
10k 20k
Hz Hz
wise delivers a whopping +15dB of gain.
THE MASTER OUTPUT SECTION —
THE TOUR CONTINUES
one-fifth of the LM-3204 we promised we'd talk
about earlier in the manual. This section is
home to the Master Faders, Control Room,
Headphone and Solo level controls, the AUX Re-
turns and, of course, the Rude Solo Light.
10k 20k
Hz Hz Hz
is a shelv-
buses is controlled by the Left and Right
Master Faders. The unity gain point for the
is a peaking EQ, mix output circuits is marked with a "U,"
with 10dB of gain available beyond that
point. When both channel strip Gain and
the Left and Right Master Faders are set at
unity, the output level of the LM-3204 will
is a shelv- be the same as the input level.
and Right Meters. These are peak averag-
ing meters, with zero (0)dB referenced to
AUX SENDS
The LM-3204 offers 4 separate sets of auxil-
Sends 1 and 3 , selected alternately by
Sends 2 and 4 , also selected alternately
All the sends on the LM-3204 are post-Gain
Each AUX send control has a "Unity" de-
The Master Output section is that right-hand
LEFT AND RIGHT MASTER FADERS
The mix level of the main Left and Right
LEFT AND RIGHT METERS
Above the Master Faders are the Left
U
1
O O +15
STEREO
U
2
O O +15
MONO
AUX
U
allows you to
–15 +15
U
–12 +12
U
GAIN
–15 +15
EQ
L L R
BALANCE
MUTE
ALT 3-4
SOLO
CHANNEL
16
U
O O
GAIN
U
1
+20
O O
U
2
+20
O O
LEVEL
STEREO AUX RETURNS
LM-3204 STEREO LINE MIXER
+ 22
10
7
4
2
0
2
4
7
10
20
30
–
40
LEFT RIGHT
9
16
3
4
SHIFT
HI
12k
MID
2.5k
LO
80
OL
-20
+30dB
U
SOURCE
3
ALT 3-4
+20
O O
U
AUX RETURN
4
TO CONTROL
+20
O O
ROOM ONLY
LEVEL
POWER
U
CLIP
+20
O O
SOLO
O O
LEVEL
PHONES
TAPE
MONITOR
dB dB
10 10
5 5
U U
5 5
10 10
15 15
20 20
30 30
40 40
O O O O
CONTROL R M