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Guided Tour - Rear Panel
1: Power on-off switch - As you may have guessed, this is what you use to turn the
MPL 1204 on and off. To avoid potential damage to your speakers, turn the MPL 1204
on before you turn on any connected power amps—and turn it off after the power amps
are turned off.
2: Fuse - Contains a 1 amp, 250 volt fuse for 115 volt operation or a 0.5 amp, 250 volt
fuse for 230 volt operation.
3: AC input - Connect the supplied standard 3-pin “IEC” plug here.
4: Mic inputs (1 - 12) - Use these electronically balanced XLR jacks to connect
microphones to the MPL 1204. These are intended to accept signal from low-level,
low-impedance mics but can also be used for signal from other sources (such as direct
injection boxes) if the channel’s Trim control (see #1 on page 4) is turned down.
WARNING: Do not connect a channel’s microphone input if you already have something
connected to its line input (see #5 below); all channels are designed to accept only one
source or the other.
5: Line inputs (1 - 12) - Use these electronically balanced 1/4" jacks to connect
line-level sources such as synthesizers, drum machines, CD players, tape decks, or
effects processors to any of the MPL 1204’s twelve channels. Use balanced three-
conductor cabling and Tip/Ring/Sleeve (TRS) plugs wherever possible (unbalanced
two-conductor plugs can also be inserted into these inputs, but you’ll get better signal
quality and less outside noise and hum if you use balanced lines). The “Connecting the
MPL 1204” section on page 11 in this manual provides more information on how best to
use channel inputs.
WARNING: Do not connect a channel’s line input if you already
have something connected to its microphone input (see #4 above); all channels are
designed to accept only one source or the other.
6: Channel Inserts (1 - 12) - Use these to insert an external effects processor (such as
outboard equalizer, compressor/limiter or noise gate) into any of the MPL 1204’s
channels in an “effects loop” configuration. These jacks accept 1/4" TRS plugs, with
the ring carrying the send signal and the tip carrying the return signal. Normally, this
will be connected to a Y-cord; see the “Connecting The MPL 1204” section on page 12
in this manual for more information and a wiring diagram.
11
MPL 1204 12 CHANNEL MIC MIXER
1/23/4
1
AUX RETURNS
STEREO INPUTS
UNBALANCED 10KΩ +4dBu
S / N
AVIS;
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE.
ON
OFF
~AC INPUT
115V/230V
50/60Hz, 25W
SAMSON
TRS
STEREO INPUT
TIP = LEFT
RING = RIGHT
SLEEVE = COM
TRS
BALANCED
TIP = HI
RING = LO
SLEEVE = COM
TRS INSERT
UNBALANCED
TIP = RETURN
RING = SEND
SLEEVE = COM
XLR
BALANCED
3 = LO
2 = HI
1 = COM
FUSE
1A/250V[115V]
0.5A/250V[230V]
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!
115V/230 - 50/60 Hz 25W
POWER
RATING
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
2
AUX SENDS
UNBALANCED <75Ω +4dBu
TAPE IN
UNBALANCED
10KΩ -10dBu
12
11
10987654321
12
12
11
11
10
10
9
9
8
8
7
7
6
6
5
5
4
4
1
1
2
2
3
3
MICROPHONE INPUTS BALANCED +4dBu TO -50dBu
LINE INPUTS BALANCED +24dBu TO -30dBu
CHANNEL INSERTS TIP RETURN -RING SEND -SLEEVE GND
BUS INSERTS
UNBALANCED 75Ω +4dBu
MIXER LINKING
4123
BUS OUTPUTS
UNBALANCED 75Ω +4dBu
4123
CONTROL ROOM
BALANCED <75Ω +4dBu
RIGHT LEFT
1
2
3
1
2
3
MAIN
BALANCED <75Ω +4dBu
POWER
L/11
R/12
RIGHT
LEFT
1
2
3
4
5
6
7
8
9
10
11
12
13