Mackie LM-3204 Owner's Manual download pdf (Page 9)

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.

The low-frequency equalizer

is a shelv-

ing EQ with the knee of the shelf set at 80 Hz.

The Lo section offers a swing of ±15dB.

The mid-frequency EQ

is a peaking 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

is a shelv-

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.

AUX SENDS

The LM-3204 offers 4 separate sets of auxil-

iary sends from each input module. Two sets

of sends per module can be selected at any

one time. The Shift switch

allows you to

choose either sends 1 and 2, or sends 3 and 4

on any channel strip.

Sends 1 and 3

, selected alternately by

the Shift button, are true stereo sends with

left and right channels maintained separately

throughout the auxiliary send circuitry.

Sends 2 and 4

, also selected alternately

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.

All the sends on the LM-3204 are post-Gain

control, post-EQ, post-Mute switch. Unfortu-

nately, due to the incredibly dense surface

mount circuitry inside this beast, modifica-

tions are not possible.

Each AUX send control has a “Unity” de-

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-

wise delivers a whopping +15dB of gain.

THE MASTER OUTPUT SECTION —

THE TOUR CONTINUES

The Master Output section is that right-hand

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.

LEFT AND RIGHT MASTER FADERS

The mix level of the main Left and Right

buses is controlled by the Left and Right

Master Faders. The unity gain point for the

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

be the same as the input level.

LEFT AND RIGHT METERS

Above the Master Faders are the Left

and Right Meters. These are peak averag-

ing meters, with zero (0)dB referenced to

100

10k

20k

–15

–10

–5

+10

+15

100

10k

20k

–15

–10

–5

+10

+15

20Hz 100Hz 1kHz 10kHz 20kHz

–15

–10

–5

+10

+15

LM-3204 Lo shelving EQ ±15dB boost/cut.

LM-3204 Mid peaking EQ ±12dB boost/cut.

LM-3204 Hi shelving EQ ±15dB boost/cut.

+30dB

BALANCE

–15 +15

–12 +12

+15

–15 +15

+15

SHIFT

-20

12k

STEREO

MONO

2.5k

MID

SOLO

AUX

CHANNEL

MUTE

ALT 3- 4

GAIN

+20

LEVEL

+20

LEVEL

+20

STEREO AUX RETURNS

AUX RETURN

TO CONTROL

ROOM ONLY

SOURCE

ALT 3-4

–

CLIP

PHONES

SOLO

+20

TAPE

MONITOR

LEVEL

POWER

LM-3204 STEREO LINE MIXER

LEFT RIGHT CONTROL R M

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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Mackie LM-3204 Owner's Manual Page 9

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