MACKIE LM-3204 - Manual (Page 12)

12
REAR-PANEL CONNECTIONS
With the exception of the handy Phones out-
put jack, all of the connections to the LM-3204 are
made on the rear panel of the unit, back in your
equipment rack where all the cabling is lurking.
LINE INPUTS
There are 32 line inputs in the LM-3204, a left-
right pair for each of the 16 input modules. The
channel inputs are each electronically balanced,
high impedance line inputs, accommodating a
range of signals from nominal levels of less than –
10dB to over +4dBu.
The input jacks will also accept unbalanced
line level inputs.
Each jack is wired as a TRS (Tip-Ring-
Sleeve) 1 ⁄ 4 " phone jack, commonly called a
“stereo” phone jack. The tip of the jack is wired
to the “high” (hot) side of the input circuitry, the
ring is wired to the “low” (cold) side, and the
sleeve is the circuit ground (earth) connection.
Standard TS (Tip-Sleeve) 1 ⁄ 4 " phone plugs
(often called “mono” plugs) may be used to
bring unbalanced signals into the LM-3204. The
sleeve of the TS plug will automatically connect
the low side of the input jack to ground and un-
balance the input.
MONO PATCHING
The stereo pair of input jacks connected to
each input module is wired so that an input sig-
nal plugged only into the LEFT (Mono) jack will
be applied to both the left and right input cir-
cuits. Inserting a plug into the RIGHT input jack
(with the LEFT input still plugged in) disables
the mono switching and returns the input mod-
ule to the stereo mode.
INSERTS—CHANNELS 1–4 ONLY
Stereo input modules 1 through 4 have channel
insert jacks on the back panel. An insert jack allows
you to tap the signal out of the circuit for processing
in another piece of equipment and then return the
processed audio back into the LM-3204.
The channel inserts occur just before the
balance, gain and EQ circuits and controls.
Mackie inserts use 1 ⁄ 4 " TRS
phone jacks, and can be used
in three different ways:
1. As a “direct output,” with no interruption of
the signal to the output section. Use a 1 ⁄ 4 "
TS (mono) plug, but insert it only to the
first click.
2. As a “direct output,” which also interrupts the
signal to the output section. Use a 1 ⁄
4
" TS
(mono) plug, and push it in all the way to the
second click.
CONCEIVED, DESIGNED, AND MANUFACTURED
BY MACKIE DESIGNS INC • WOODINVILLE • WA
98072 • USA • MADE IN USA • FABRIQUE AU USA
RISK OF ELECTRIC SHOCK
DO NOT OPEN
R L
1 2 3 4
(MONO)
L
15
CONTROL ROOM
OUTPUTS
R
(MONO)
L
R
R L
ALT 3/4
OUTPUTS
EXPANDER IN
STEREO AUX RETURNS
LM-3204 • STEREO • LINE • MIXER
1 2 3 4
AUX SENDS
L
R
L
STEREO
MONO
R
16
USE ONLY WITH LM-3204E EXPANDERS.
STEREO
REPLACE WITH THE SAME TYPE FUSE AND RATING.
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE UTILISE UN FUSIBLE DE RECHANGE DE M
DEBRANCHER AVANT DE REMPLACER LE
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COV
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED
AVIS: RISC DE CHOC ELECTRIQUE NE PAS OUVRIR
C A U T I O N
Direct out with no signal interruption to master.
Insert only to first click
Direct out with signal interruption to master.
Insert all the way in to the "second click"
For use as an effects loop.
(TIP = send to effect, RING = return from effects)
MONO PLUG
MONO PLUG
STEREO
PLUG
TIP RING
tip
this plug connects to the CR-1604
"ring"
tip
ring
shield
SEND
RETURN