MACKIE M1200/M1400 - Manual (Page 4)

4
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6. Determine which AMP MODE is best
for your application:
• STEREO mode (separate left and right
inputs, separate left and right outputs) is
the typical setup for amplifying stereo
signals.
• MONO mode (sometimes called Dual-
Mono mode – one mono input, two mono
outputs) is for sending a mono signal to
two different speaker sets, with separately-
adjustable level controls.
• BRIDGE mode (sometimes called
Bridged-Mono – one mono input, one mono
output) uses both sides of the amp to
double the power to one speaker set. An
M•1200 power amplifier, set to
BRIDGE
mode, delivers 1200 watts (into 4 ohms).
The M•1400 delivers 1260 watts. Garsh!
Note: 4 ohms is the minimum impedance
you should connect to the amplifier in BRIDGE
mode. If you connect a lower impedance load
in
BRIDGE mode, the SHORT LEDs may
light, putting the amplifier into PROTECT
mode.
Set the AMP MODE switch accordingly.
7. In STEREO mode, connect line-level cables
from your signal source to the M•1200/
M•1400’s
INPUT jacks, either XLR or
TRS:
• The XLR and TRS inputs for each
channel are wired in parallel.
• The balanced XLR inputs are wired
pin 2 = hot (+), pin 3 = cold (–) and
pin 1 = shield (ground).
QUICK START
I got ants in my pants and I got to dance!
INSTALLATION
The M•1200/M•1400
amps can be mounted in
any standard rack system
(see
), or placed horizon-
tally on a floor or table. The heavier internal
components are located towards the front of
the chassis to make it easier to hold the amp
by its front handles.
IMPORTANT: The
M•1200/M•1400 amps
draw their ventilation air
in from the front and out
through the side panels.
They need plenty of fresh air to stay cool.
DO NOT BLOCK THE VENTILATION PORTS
(see
).
CONNECTIONS AND SETTINGS
1. Be sure the POWER switch is off before
making connections.
2. Turn the GAIN controls fully down
(counterclockwise) for now.
3. Set both LOW CUT FILTER controls to
their TYPICAL marks (35Hz).
4. Set both CONSTANT DIRECTIVITY
switches OFF (unless you’re using constant
directivity horns with compression drivers).
5. Set the LIMITER switch on.
Note: If you’re using the M•1200/M•1400 to
power a subwoofer, you probably do not need
an external crossover. Please see
for details.
OL
–3
–6
–9
–20
–3
–6
–9
–20
SIG
OL
SIG
CH
1
30
28
26
20 22 18
24 16
14
8
0 0
1.23v (+4dBu) SENSITIVITY
GAIN/dB CH
2
PROTECT
COLD HOT
SHORT
TEMP STATUS
INTERNAL STATUS
CH
1
CH
2
CH
1& 2
ON
OFF
POWER
3v
2v
1v
30
28
26
20 22 18
24 16
14
8
0 0
1.23v (+4dBu) SENSITIVITY
GAIN/dB
3v
2v
1v
PROFESSIONAL POWER AMPLIFIER FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN