Mackie LM-3204 User Manual download pdf (Page 3)

between the mixer and the

optional expander unit(s), if

used; and which shall be

designed to mate with the

connectors on the expander

ribbon cable provided with

each Expander unit.

16. PHYSICAL CONFIGU-

RATION. The mixer shall

have a steel chassis frame

painted grey-black and

designed to mount in a

standart 19" relay rack. The

mixer’s dimensions shall be

8.73" high (5 rack units) by

19.00" wide (rack ears are

built-in) by 9.66" deep.

17. OVERALL MINIMUM

SPECIFICATIONS. In ad-

dition to specifications

previously cited, the

mixer shall meet or

exceed the following

performance criteria:

Noise. (20 Hz–20 kHz

bandwidth, Line inputs to

Main L/R outputs, all chan-

nels assigned.) Master

fader down, Channel gains

down, –104.2 dBu. Master

fader unity, Channel gains

down (Mix Noise), –86.6

dBu. Master fader unity,

Channels gains unity,

–84.0 dBu.

Total Harmonic Distortion.

(1 kHz @ +14 dBu,

20 Hz–20 kHz.) Channel

input to any output, below

.0025% typical.

Attenuation (1 kHz @

0 dBu. 20 Hz–20 kHz

bandwidth, Channel in, to

Main Left outputs.) Chan-

nel gain down, –73 dBu.

Channel muted, –81 dBu.

Frequency Response.

(Any input to Main out-

put.) 20 Hz to 60 kHz,

+0 dB/–1 dB. 10 Hz to

100 kHz, +0 dB/3 dB.

Maximum Levels. Mic

preamp input, +14 dBu. All

other inputs, +22 dBu. All

outputs, +22 dBu.

Impedances. Mic preamp

input, 2.5 kΩ. All other in-

puts, 10 kΩ. All outputs,

120 kΩ.

Equalization. Lo EQ Shelv-

ing @ 80 Hz, ±15 dB. Mid

EQ Peak @ 2.5 kHz,

±12 dB. Hi EQ Shelving @

12 kHz, ±15 dB.

Microphone Preamp. E.I.N.

(150 Ω terminated, maxi-

mum gain), –129 dBm.

18. DESIGNATION. The

audio mixer shall be a

Mackie Designs LM-3204.

21. INPUT CHANNEL

CONNECTIONS. Each

expander input channel

shall have a left and a right

electronically balanced line-

level input, accommodating

a nominal line level of

between –10dBV and

+4dBu, and appearing on

the rear panel as

/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 connec-

tions, appearing on the rear

panel as

/4" TRS phone

jacks (tip send, ring return).

22. INPUT CHANNEL LEVEL

AND ASSIGNMENT CON-

TROLS AND INDICATORS.

Each expander input chan-

nel 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. Additionally, any

soloed channel(s) shall have

their –20 and O/L LEDs light

steadily, to indicate a solo

condition.

23. INPUT CHANNEL

EQUALIZATION. Each

expander input channel shall

be equipped with a stereo

equalization function. The

equalizer shall have three

sections: a low-frequency

shelving equalizer with the

knee set at 80Hz and a range

of ±15dB; a mid-frequency

peaking equalizer centered

at 2.5kHz featuring a band-

width of 2 octaves and a

range of ±12dB; and a high-

frequency shelving equalizer

with the knee set at 12kHz

and a range of ±15dB.

24. INPUT CHANNEL

AUXILIARY SENDS. Each

expander input channel

shall have one stereo

19. GENERAL

CONFIGURATION. The

expander unit shall not be

designed to operate alone,

but in conjunction with a

Mackie Designs LM-3204

Line Mixer. The expander

shall have a rack-mount-

able frame which accom-

modates 16 stereo input

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.

Additionally, the expander

shall include 4 stereo

effects return inputs.

20. POWER SUPPLY. All

necessary operating voltages

for the expander shall be

provided by an internal

shielded power supply.

LM-3204E Expander

1 2 3 4

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