If the OL (Overload) LED is blinking frequently or continuously, turn down the source signal (i.e. the mixer’s master faders).

SIG

SIG (short for “signal present”) is the lowest step in the meters’ ladder. It senses the signal prior to the GAIN control, so when SIG is lit, you know the M•1200/M•1400 is receiving signal. If it’s the only meter LED lit (meaning the other meter LEDs are not lit), the M•1200/M•1400 is receiving a very weak signal (below –20 dB).

PROTECT

If the PROTECT LEDs are on, the M•1200/ M•1400’s output section has shut down. That, of course, means you won’t hear anything until you rectify the situation. Three things can cause the PROTECT circuit to engage:

1.Powering up the M•1200/M•1400. A built- in delay circuit saves your speakers (and ears) from the thumps or pops that can sometimes occur when powering up a system. During this 3 second delay, the PROTECT LEDs light up.

2.A short circuit (or near short) in either of

the outputs. Both the PROTECT and the SHORT LEDs light up.

3.The temperature in the M•1200/M•1400

has risen to an unsafe level. The PROTECT and the TEMP STATUS LEDs light up.

The M•1200/M•1400

amps draw their ventila-

tion air in from the front

and out through the side panels. The amp needs

plenty of fresh air to stay cool. DO NOT BLOCK THE VENTILATION PORTS. See “Thermal Considerations” .

SHORT

If this LED comes on, the M•1200 or M•1400 has detected a short circuit in either of the outputs, meaning that the hot (+) and cold (–) speaker wires are touching, or a speaker itself is shorted out. Such a condition causes the M•1200/M•1400 to engage its PROTECT mode (when a signal is present), muting all signals at the amp’s outputs.

This short-circuit LED is a Mackie exclusive (until the other guys “borrow” the idea) and can save precious minutes of your trouble- shooting time. Without it, you’d still have speaker and amp protection (via the PROTECT circuit), but you wouldn’t be able to determine the source of the problem. But with the SHORT LED, the M•1200/M•1400 comes right out and tells you!

WARNING: The SHORT LEDs indicate an unsafe condition for the power amplifier. Once the SHORT LED is lit, you must turn the power off, wait for the indicator to extinguish, and turn the power back on again to reset the am- plifier.

Typical causes for a “short” indication would be either a shorted speaker cable or too many speaker cabinets connected to the amplifier (i.e., the load impedance is too low). If a “short” is indicated, please check your cables. If the cabling is OK, then reduce the number of cabi- nets driven by the amplifier.

PROFESSIONAL POWER AMPLIFIER

ON

OFF

POWER

13

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Mackie M1200/M1400 owner manual Sig, Outputs. Both the Protect and the Short LEDs light up
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M1200/M1400 specifications

The Mackie M1200 and M1400 are two prominent power amplifiers that have gained recognition for their reliability, performance, and innovative design in the professional audio field. Engineered for both live sound and studio applications, these amplifiers deliver exceptional sound quality and unmatched power, making them a favorite among audio professionals.

One of the standout features of the M1200 and M1400 is their impressive power output. The M1200 boasts a power output of 1200 watts at 4 ohms, while the M1400 takes it a step further with 1400 watts at 4 ohms. This substantial power allows users to drive a wide range of speakers, making them suitable for various settings, from small clubs to large venues and outdoor events. Furthermore, they excel in providing clean, distortion-free sound even at high volumes.

Both models incorporate Mackie's patented Smart Protect DSP technology. This intelligent thermal and signal protection system helps prevent overheating and ensures that the amplifiers operate within safe limits, enhancing longevity and reliability. The DSP also contributes to superior sound quality, maintaining clarity and detail across different frequency ranges.

Another key feature of the M1200 and M1400 is their rugged construction. Designed for the rigors of touring and live performances, these amplifiers feature a sturdy chassis that withstands the challenges of transport and heavy use. Their efficient heatsink design allows for effective cooling, ensuring the amplifiers remain operational even under demanding conditions.

In terms of connectivity, both models are versatile. They offer XLR and TRS inputs, allowing compatibility with a variety of audio sources. The outputs include Neutrik Speakon connections, providing secure and reliable speaker connections. Additionally, the amplifiers have built-in limiters that help to prevent speaker damage by controlling signal levels.

The user-friendly interface of the M1200 and M1400 includes level control knobs, LED indicators for power and signal, and a comprehensive set of output options. This simplicity ensures that audio engineers can quickly adjust settings to cater to specific acoustic environments, making setup and operation seamless.

In conclusion, the Mackie M1200 and M1400 power amplifiers are remarkable for their powerful performance, durability, and advanced technology. Whether for live sound reinforcement or studio applications, these amplifiers continue to set a standard in audio excellence, proving their worth to sound engineers worldwide.
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