Mackie LM-3204, LM-3204E User Manual
32x2x2 STEREO LINE MIXER
XLR input switchable phantom microphone powering, a
preamplifier gain control and
a balanced line-level output.
2. POWER SUPPLY. All
necessary operating volt-
1. GENERAL CONFIGURATION. The audio mixer shall
have a rack-mountable
frame which accommodates
16 stereo input channels, 2
main output channels and 2
alternate output channels.
Each input channel shall be
capable of accepting either
stereo or monaural signals,
and shall be fitted with
stereo level, equalization,
balance, solo, muting and
auxiliary send controls,
level-indicating (-20) LEDs
and overload (O/L) LEDs.
Input channels 1 through 4
shall each be fitted with left
and right insert jacks. The
main output channels shall
each have a level control, an
electronic level meter and a
bus insert jack.
Additionally, the mixer shall
include a solo function, a
monitor switching and
control function, 4 stereo
effects return inputs with
alternate routing switching,
2 stereo pairs effects send
outputs, 2 monaural effects
send outputs, 1 stereo pair
control room output, 1
stereo headphone output,
1 set of stereo tape recorder RCA outputs, and 1
set of stereo tape monitor
RCA inputs. The mixer shall
also include 2 independent
patchable microphone preamplifiers, each fitted with
an electronically balanced
ages for the mixer shall be
provided by an internal
shielded power supply.
3. INPUT CHANNEL CONNECTIONS. Each mixer
input channel shall have a
left and a right electronically balanced line-level
input, accommodating a
nominal line level of between –10 dBV and +4
dBu, and appearing on the
rear panel as 1⁄4" TRS
phone jacks (tip hot, ring
cold). The jacks shall be fitted with internal switches
to accommodate monaural
configuration. Additionally,
input channels 1 through 4
shall offer left and right
unbalanced insert connections, appearing on the rear
panel as 1⁄4" TRS phone
jacks (tip send, ring return).
4. INPUT CHANNEL LEVEL
AND ASSIGNMENT CONTROLS AND INDICATORS.
Each mixer input channel
shall be equipped with a
rotary dual gain control, a
solo switch, a mute switch
which also functions as an
assignment switch to the
alternate output channels,
and a stereo balance control.
5. INPUT CHANNEL
EQUALIZATION. Each mixer
input channel shall be
equipped with a stereo
equalization function. The
equalizer shall have three
sections: a low-frequency
2/6/98
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shelving equalizer with the
knee set at 80 Hz and a
range of ±15 dB; a midfrequency peaking equalizer
centered at 2.5 kHz featuring a bandwidth of 2 octaves and a range of ±12
dB; and a high-frequency
shelving equalizer with the
knee set at 12 kHz and a
range of ±15 dB.
6. INP UT CHAN NEL AUXILIARY SENDS. Each mixer
input channel shall have 1
stereo auxiliary send control
and 1 monaural auxiliary
send control. The auxiliary
send controls shall be
switchable between 2 sets
of auxiliary send buses,
®
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accommodating a total of
2 stereo auxiliary send
buses and 2 monaural
auxiliary send buses.
7. MAIN OUTPUT CONNECTIONS. The mixer shall have
electronically balanced, linelevel left and right main outputs, appearing as 1⁄4" TRS
jacks (tip hot, ring cold) on
the rear panel. Additionally,
the main buses shall offer
left and right unbalanced
insert connections, appearing on the rear panel as 1⁄4"
phone TRS jacks.
8. OTHER OUTPUT AND
MONITORING CONNECTIONS. The mixer shall have
the following balanced linelevel connections, appearing
as 1⁄4" TRS jacks on the rear
panel: left and right alternate (3–4) outputs, left and
right control room outputs.
For convenience, the left
and right main outputs and
the left and right tape monitor inputs shall also appear
as RCA phono jacks on the
rear panel. There shall also
be a stereo headphone output on the front panel of the
mixer, carrying the control
room monitor signals at levels and impedances proper
for headphones. The headphone output connection
shall be a stereo 1⁄4" TRS
jack (tip left, ring right).
9. OUTPUT AND MON ITORING CONTROLS AND
SWITCHES. The mixer shall
include 2 linear fader controls for gain adjustment of
the main L/R outputs, covering a range from infinite
attenuation to +10 dB
above unity gain. A tape
monitor switch shall alternately select either the
main L/R outputs or the
signal at the tape inputs as
the source for the control
room and headphones
monitoring circuits. There
shall be a stereo linear
fader control for level adjustment of the control
room monitor output, and
a stereo rotary control for
level adjustment of the
headphone monitor output.
The mixer shall have a
stereo control for adjustment of the monitoring
level of the internal solo
signals, and a blinking LED
to indicate channel solo
condition. Additionally, any
soloed channel(s) shall
have their -20 and O/L
LEDs light steadily, to indicate a solo condition.
10. OUTPUT METERING.
The mixer frame shall include 2 12-segment LED
meters each displaying a
signal range from –40 dBu
to +10 dBu, each with an
additional LED indicating
mixer clipping level at +22
dBu. The meters shall monitor the main left and right
output channels; alternately,
the meters shall monitor the
tape return signals when
the tape monitor switch is
depressed; or, the soloed
input channel signals when
any combination of solo
switches is depressed.
11. AUXILIARY SEND C ONNECTIONS. The mixer shall
include balanced line-level
outputs from the auxiliary
send buses. The left and
right outputs of the 2 stereo
auxiliary send buses and the
outputs of the 2 monaural
send buses shall appear on
the rear panel as 1⁄4" TRS
phone jacks (tip hot).
12. AUXILIAR Y RETURN
CONNECTIONS. The mixer
shall include 4 stereo auxiliary return inputs. Each auxiliary return shall have a left
and a right unbalanced linelevel input, accommodating
a nominal line level of between –10 dBV and +4 dBu,
and shall appear on the rear
panel as 1⁄4" phone TRS
phone jacks. The jacks shall
be fitted with internal
switches to accommodate
monaural configuration, by
using only the left jack(s).
13. AUXILIARY RETURN
CONTROLS AND SWITCHES.
The mixer shall include 4
dual-channel auxiliary return
gain controls, each feeding
the main stereo buses. Auxiliary return #3 shall have its
signal source switchable between the auxiliary return #3
inputs or the signals available on t he a lt er n at e (3–4)
mix outputs. Auxiliary return
#4 shall be assignable to
two different destinations,
feeding either the main left
and right buses or the
monitor system only.
14. MICROPHONE PR EAMPLIFIERS. The mixer
shall include two microphone preamplifiers
mounted on the rear of the
mixer frame. Each microphone preamplifier shall
feature electronically
balanced transformerless
inputs using female
XLR-3-type connectors with
gold-plated pins, a rotary
sensitivity control adjustable from –50 dBu to –10
dBu, and a line-level impedance-balanced output
appearing at a 1⁄4" TRS
phone jack. Globally switchable phantom power shall
be available at the
microphone inputs.
15. MIXER EXPANDER
FUNCTION. The mixer buses
shall accommodate up to
48 additional stereo input
channels when connected
to up to 3 Mackie Designs
LM-3204E Expander units.
The mixer shall be fitted with
a 20-pin IDC-type “expander
input” connector mounted
on the rear of the mixer
frame, which shall carry all
audio and control signals
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