The M4000 Power Amplifier is the culmination of Mackie's research into the world of high efficiency sound reinforcement, boasting a three rail Class H power design. The extra power rails are only engaged when the amplifier is driven at high volumes, maintaining a lower power draw, and lower temperatures, when the second and third rail are not required. The M4000 utilizes two variable speed fans for cooling, bringing cool air into the unit from intake vents located in the rear. Because these fans spin at extremely low speeds (or not at all) when the amplifier is running at low volumes, the M4000 can be used in a studio without worry that the fans will disturb a recording or mixing session. This high level of efficiency allows the M4000 to have a much longer expected lifespan than other types of power amplifiers, enabling Mackie to back each unit with a five year limited warranty against defects or equipment failure.

At the rear of the unit are two switches for each channel, to independently enable or disable 150 Hz crossover or volume limiting on a per channel basis. The crossover function is useful when a different type of speaker load needs to be connected to each channel, such as a subwoofer on one and a main speaker on the other. Also, the crossover function can be used to bi-amplify a single speaker. The limiting function, meanwhile, halts the damage that can be caused by transient attacks before they occur. The momentary volume increase of snare drum hits or bass slaps can cause speaker damage if they are allowed to pass through an amplifier as clipped waveforms. When enabled, the M4000's limitation function automatically reduces the volume of these transient attacks, preventing clipped waveforms from reaching the speakers and potentially causing permanent damage.

The Mackie brand name is very familiar to musicians and studio operators throughout the world. Mackie has gained fame for providing top quality studio amplification, speakers, mixers, and more, and have entered the world of live sound with their M-Series of power amplifiers. Mackie M4000 Power Amplifiers are the flagship model from the M-Series, providing a maximum of 4000 watts of muscle in a package that is as comfortable in the studio as it is on stage.

Mackie M4000 Power Amplifiers - Summary:
* Rated for a maximum power output of 4000 watts in mono bridged operation, or 2000 watts per channel when driving 2 ohm stereo speakers
* 150 Hz crossover function enables different speaker loads to be driven on the same unit, such as a subwoofer on one channel and main speaker on the other
* Limiter transparently reduces the volume of transient attacks, preventing clipped waveforms from causing damage to the speakers
* Highly efficient dual fan cooling system operates in near silence when the amplifier is operated at low power levels, appropriate for studio monitor environments

The M3000 is a dual channel power amplifier, rated for a maximum power output of 3000 watts in bridged mono mode, or 1500 watts per channel when driving a pair of 2 ohm stereo speakers. Mackie has designed the M3000 to be used either in studios or in concerts, giving it a dual variable speed fan cooling system that remains off when the amplifier is idle or operating at low volumes. At high volumes, the amplifier’s three rail Class H circuitry engages, allowing power to be drawn equally across these multiple rails (The M2000 only has two rails), maintaining that same level of efficiency across the amplifier's entire volume range. This extremely efficient operation greatly extends the expected life of the power amplifier, allowing Mackie to offer a limited five year warranty against defects or equipment failure for each unit.

At the rear of the unit are two switches for each amplifier channel, allowing 150 Hz crossover and signal limiting to be independently engaged or disengaged on a per-channel basis. The crossover feature allows the amplifier to easily be used to drive both a subwoofer and main speaker simultaneously, or to drive a single bi-amplified speaker. Multiple M3000 units can also be used in tandem, to drive a maximum of 24 bi-amplified speakers in a very large or outdoor concert environment. Signal limiting can also be enabled or disabled on each channel. This technology allows the amplifier to easily pass transient attacks such as a particularly hard snare drum hit or bass pop, by transparently reducing the volume level to prevent clipped waveforms from reaching the speakers.

Mackie has been well known in the music industry for many years as a top provider of sound equipment for recording studios and live concerts. With its M-series of power amplifiers, Mackie has brought some of this studio technology to the live stage, giving musicians a new level of sound quality and efficiency that they may not have previously expected from a power amplifier. Mackie M3000 Power Amplifiers are the midrange offering in this series, featuring even more wattage and greater efficiency of power usage than the M2000.

The M3000 features a solid rackmount construction, with a weight of 48 pounds. Its high level of efficiency ensures that it will be able to power your next all day concert event at any venue without breaking a sweat.

Mackie M3000 Power Amplifiers - Summary:
* Rated for a maximum power output of 3000 watts (mono, bridged), or 1500 watts per channel when driving a 2 ohm speaker load
* Independently selectable 150 Hz crossover allows the easy operation of bi-amped speakers or a subwoofer and main speaker simultaneously
* Transparent limiting reduces the amplitude of transient attacks before they can cause speakers to clip
* High efficiency design allows studio installations to operate in near silence, or all day concert events at loud volumes

The M2000 is a 2000 watt power amplifier when operating in bridged mono mode. It can also drive a two channel stereo load at a maximum of 1000 watts per channel with 2 ohm speakers. It is designed to be used either in studio or live concert environments. The innovative cooling system features two variable speed fans which bring cool air in from the rear of the unit. When the amplifier is at idle, or operating at low volumes, the fans will remain off or spin at low speeds, ensuring that your recording or mixing sessions will not be disturbed by fan noise.

Transient attacks, such as a particularly energetic drum fill or bass pop, can often be the bane of a power amplifier's existence. These come across an amplifier at much higher volumes, which can result in audible distortion, damaging your speakers or other equipment, and offending the ears of your audience. The M2000 has a built in limiting circuit, which automatically senses transient attacks and reduces their volume to prevent the waveforms from clipping. This process is so transparent that you may not even hear it taking place. For studio or low volume operation, however, the limiting circuit can easily be disabled on a per-channel basis. The M2000 also has a crossover filter for each channel, allowing it to drive both a subwoofer and main speaker simultaneously or power a bi-amplified speaker.

For those musicians who keep their amplifier running at high levels all day, the M2000 introduces some innovative new features designed to increase efficiency, and therefore the life of the unit. One of these is a 2-rail Class H electrical design, which utilizes additional power rails only when they are absolutely required. This avoids the common problem of an amplifier losing its efficiency, and increasing greatly in temperature, when it is used at higher volumes. The M2000 is an extremely solid package, weighing in at 41 pounds. It is backed by Mackie's five year limited warranty.

Based in Washington State, Mackie is a provider of various types of sound reinforcement technology including mixers, loudspeakers, and amplifiers. They are a relatively new player in the power amplifier market, but continue to make a splash with each new release. Mackie M2000 Power Amplifiers are part of a new class of power amps, determined to offer one of the most efficient amplifier designs ever, along with a high degree of user friendliness.

Mackie M2000 Power Amplifiers - Summary:
* Rated for a maximum output of 2000 watts (mono, bridged), or 1000 watts per channel in stereo mode
* Adaptive circuitry limits transient attacks, preventing clipped waveforms from damaging your speakers
* High efficiency design draws extra current only when needed, keeping the unit running in near silence when operated at low volumes
* Crossover filter available for each channel, allowing for simultaneous subwoofer and main speaker, or bi-amplified, operation