“square off,” and the average power going into the speaker is roughly double that of a sine wave. Square waves sound awful, and could possibly damage your speakers and/or your reputation.

The LIMITER is especially handy when you’re working with loud output levels. Having the signal spikes (kick drum, for instance) at- tenuated a bit can actually increase the apparent loudness of the overall mix without diminishing the “power” behind the spikes.

Be Forewarned: With the

LIMITER engaged, you can

still overdrive the amplifier

into clipping. It just takes a stronger signal to do it. So

even with the LIMITER turned on, you should still pay attention to the OL LEDs .

SUBWOOFER

Here’s a special surprise: If you bought the M•1200/M•1400 amplifier to power a subwoofer system, you just saved yourself the cost of a crossover! The M•1200/M•1400 amps have an active SUBWOOFER filter built in. You can use it, along with the variable LOW CUT FILTER in a second M•1200/M•1400, to reproduce the function of a crossover.

5dB

0dB

–5dB

–10dB

–15dB

20Hz

100Hz

1kHz

10kHz 20kHz

Subwoofer Filter

Since most low-frequency energy is mono- phonic (the same in both channels), the subwoofer circuit takes the signal from both Channels 1 and 2 and sums them together. This summed signal is then directed to both power amplifier output stages. It doesn’t matter whether the AMP MODE switch is set to STEREO, MONO, or BRIDGE, it will sum the inputs when the OUTPUT APPLICATION switch is set to SUBWOOFER.

Here’s how to configure it:

1.Turn the M•1200/M•1400’s POWER off.

2.Set the OUTPUT APPLICATION switch to SUBWOOFER.

3.Select a rolloff point, via the FREQUENCY

switch: At “125Hz,” you’ll get the low sub-harmonics on up to the audible bass range. At “63Hz,” you’ll get just the lowest frequencies, more to be felt than heard.

You’ll probably want to try this switch both ways.

4.Connect your cords and speaker cables as

usual (see “Quick Start” ). Set the AMP MODE to either STEREO, MONO, or

BRIDGE, depending on your application. (STEREO and MONO operate the same with SUBWOOFER activated).

5.Turn the M•1200/M•1400’s POWER on. Woof!

If you want to use a second M•1200/M•1400 to reproduce the rest of the audio range, follow this procedure:

1.Connect the THRU jacks on the first subwoofer amplifier to the INPUT jacks on the second amplifier.

2.With POWER off, set the OUTPUT APPLICATION switch on the second amplifier to FULL RANGE (LIMITER either

ON or OFF).

1CHANNEL / BRIDGE / MONO

LOW CUT

INPUT

FILTER

 

TYPICAL

BALANCED

OR

35 Hz

UNBALANCED

 

STAGE

 

MONITOR

AMP MODE

STEREO

MONO

 

BRIDGE

TYPICAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INPUT

BALANCED

OR

UNBALANCED

CHANNEL 2

LOW CUT

FILTER

TYPICAL

35 Hz

STAGE

MONITOR

100 Hz

OUTPUT APPLICATION

100 Hz

OFF

170 Hz

 

FULL

 

SUB

 

OFF

170 Hz

 

 

 

RANGE

 

WOOFER

 

 

 

 

CONSTANT DIRECTIVITY

LIMITER (CH1 & CH2)

FREQUENCY

 

CONSTANT DIRECTIVITY

 

HORN EQ/AIR EQ

 

 

 

 

HORN EQ/AIR EQ

 

 

 

STEREO

 

 

 

 

4.5 kHz

 

 

125Hz

 

4.5k Hz

ON

TYPICAL

 

ON

 

 

 

 

 

2k Hz

5.6k Hz

 

ON

OFF

63Hz

 

2k Hz

5.6k Hz

 

AIR EQ

OFF

 

 

 

OFF

 

AIR EQ

 

 

TYPICAL

 

 

 

TYPICAL

 

 

 

 

THRU

 

 

THRU

 

 

21

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Mackie Subwoofer, Here’s how to configure it Turn the M1200/M1400’s Power off, Turn the M1200/M1400’s Power on. Woof
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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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