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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.
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
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 
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
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| FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN |
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| PROFESSIONAL POWER AMPLIFIER | ||||||
CH | GAIN/dB |
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| GAIN/dB | CH | CH | CH |
| ||||
1 |
| 3v |
| OL |
| OL |
| 3v |
| 2 | 1 | 2 |
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18 | 20 | 22 |
| 18 | 20 | 22 | INTERNAL STATUS | ON | |||||
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| 2v |
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| 2v |
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| 16 |
| 24 |
| 16 |
| 24 |
|
| PROTECT |
| ||
| 14 |
| 26 |
| 14 |
| 26 |
|
| SHORT |
| ||
| 8 |
| 28 |
| 8 |
| 28 |
| TEMP STATUS | OFF | |||
|
|
| 30 |
|
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| 30 |
|
| CH |
|
| 00 |
| 1v |
|
|
| 00 |
| 1v |
| COLD | 1& 2 |
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| SENSITIVITY |
| 1.23v (+4dBu) |
|
|
| SENSITIVITY |
| 1.23v (+4dBu) |
| HOT | POWER | |
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| SIG | SIG |
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