Mackie M1200/M1400 owner manual Bridge, Output Application, Limiter, NEL 1 inputs only

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The AMP MODE switch determines the in- put signal routing within the M•1200/M•1400 amplifier. Shipped from the factory, the switch is set to STEREO. This is correct for about 90% of the applications using an amp like this (hence the TYPICAL indicator near it). But you may be in the 10% bracket, requiring spe- cial input routing within the amp.

AMP MODE should be configured before operation — if you must change it during per- formance, turn down the GAIN controls as a precaution to protect the speakers from any inadvertent pops or thumps.

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 – one mono input, two mono outputs) is for sending a mono signal to two different speaker sets, with separately-adjustable GAIN 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. With two M•1200 power amplifiers, each set to BRIDGE mode, you can deliver as much as 1200 watts per amplifier.

If you set the AMP MODE switch in MONO or

BRIDGE, use the CHAN-

NEL 1 inputs only — the

CHANNEL 2 inputs go no- where in this case.

Note: There is one exception to this rule. If you have the OUTPUT APPLICATION switched to SUBWOOFER, the inputs to Channels 1 and 2 are summed regardless of the AMP MODE setting (see ). Also, BRIDGE mode re- quires special connections at the SPEAKER OUTPUTS .

BRIDGE

In STEREO mode, the M•1200 Power Amplifier can deliver 600 watts per side into

2 ohms. If that’s not enough, you can use two M•1200s, each in BRIDGE mode, and deliver 1200 watts per amplifier into 4 ohms. The M•1400 produces 630 watts per side into

2 ohms in STEREO and 1260 watts into 4 ohms in BRIDGE mode. Or, you can use one amp in BRIDGE mode to power a monaural system. Finally, BRIDGE mode is also popular for subwoofer applications — but please see SUBWOOFER for a special subwoofer surprise.

To use all the M•1200/M•1400’s power to drive one speaker cabinet using BRIDGE mode, you’ll have to do four things:

1.Turn off the power to the M•1200/M•1400.

2.Set the AMP MODE switch to BRIDGE.

3.Connect the positive side of the speaker cable to the Channel 1 red (+) binding post.

4.Connect the negative side of the speaker cable to the Channel 2 red (+) binding post.

5.(Okay, make that five things!) Use only the CHANNEL 1 INPUT (unless you’re using the SUBWOOFER OUTPUT APPLICATION).

The CHANNEL 1 GAIN control adjusts the output level of the amplifier. The CHANNEL 2 GAIN control has no effect.

Once again: Before making connections to an amp or reconfiguring an amp’s routing, turn the power off, make the changes, then turn the power back on.

OUTPUT APPLICATION

The OUTPUT APPLICATION switch should be configured before you turn on the amplifier. This switch allows you to choose between three different configurations:

LIMITER ON (TYPICAL). This is the normal configuration: full-bandwidth audio with pro- tective limiting (please see ).

LIMITER OFF is also full bandwidth audio, but without protective limiting (please see ). SUBWOOFER mode, with built-in low-pass filter, no protective limiting (please see ).

LIMITER

The LIMITER is not designed to alter your sound — it’s just there to protect your speak- ers from clipping. Its effect is virtually transparent, meaning you probably won’t even notice any audible difference. We recommend that you leave it engaged (via OUTPUT APPLI- CATION ), hence the TYPICAL label below it.

If you’re working at quiet levels all the time, or you’ve already placed a compressor/limiter in the signal path, or if you just hate compres- sion, you can leave the LIMITER out of the circuit (via OUTPUT APPLICATION ).

The LIMITER senses when

the amp is about to be

overdriven and attenuates

the overall level just enough to keep the signal from clip- ping. Clipping occurs when the output voltage

no longer linearly follows the input voltage and simply stops. This causes a sine wave to

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Contents Speaker Outputs Safety Instructions Noise level exposures shown in this chart Manent hearing lossTo suffi Protectors Ciently While thisBe sure the Power switch is off before making connections Quick StartM1200/M1400 Amps can be mounted M1200/M1400 ampsThings You Must Remember 1/4 TS connectors are wired Tip = hot + and sleeve = coldStart dancing, but don’t let the ants out of your pants Application Diagrams Plug for the Connectors SectionGeneral Precautions Considerations Arcane Mysteries IlluminatedContents Application M1400 Main Speakers and Stage Monitors with ONE Amplifier M1200/M1400 Stereo System with Bridged Subwoofer Gain DB for those of you sittin’ there with your calculatorMeters High Current DesignSIG ProtectShort Outputs. Both the Protect and the Short LEDs light upPower Temp StatusPower Cord Fiers first. When poweringSpeaker Outputs If you shut down your System, turn off your ampliAn amp’s signal routing InputBe Aware Should you Choose to terminate your Speaker cables withPin Shield Hot + PinCold Pin Ring Constant Directivity ThruLOW CUT Filter AMP Mode More on Constant Directivity HornsBridge Output ApplicationLimiter NEL 1 inputs onlyHere’s how to configure it Turn the M1200/M1400’s Power off Turn the M1200/M1400’s Power on. WoofSubwoofer Select a rolloff point, via the FrequencySubwoofer Frequency switch setting either 63Hz or 125Hz Thermal Considerations AC Power ConsiderationsRack Mounting Input Wiring Output WiringAC Power Distribution FeetLoad Gauge Impedance Wire70V Distribution Systems Warranty Service TroubleshootingMake sure the AMP Mode switch is set to Bridge Are both Gain knobs set to the same position?Wood-Red Rd. NE Woodinville, WA RepairMackie Designs Sound Pressure Level SPL measured with an a weighting filter Term for a sound mixer, usually a large desk-like mixerEMI Frequency See HertzControl affecting the final output of a Signal whose level falls between -10 dBu and +30 dBuMale counterpart to the phone jack. See above TRS Unity gainXLR Connectors ⁄4 TS Phone Plugs and JacksUnbalancing a Line InstrumentsSpeakons Binding PostsBalanced lines offer increased immunity Balanced LinesBalanced line is a three Grounding Here are some guidelinesOptimizing Sound System Levels Don’t use hardware-store light dimmersNext set the master output level fader Dynamic RangeBiamplified System with Active Crossover Ohm speaker load is twice as heavy as a Do the Math OHMS, Loads and SuchAs a load gets heavier, its impedance in ohms decreases Specifications Indicators Power ConsumptionAC Line Power Limiter SectionFreq Colophon Mackie Designs Inc All Rights Reserved

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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