M-4000 High-Efficiency Stereo Power Amplifier

The Mackie M-4000 power amp squeezes every drop of power out of standard 120/240V power outlets. And not only does the M-4000 deliver major watts, but it sounds incredible, thanks to Class-H power stages, new built-in limiter, a sparing use of negative feedback, and perfect crossover integration with Mackie's Precision Passive loudspeakers. The next-generation Mackie Fast Recovery and Adaptive Slew circuitry lets it run "in the red" for hours on end without compromising sound integrity.

Stereo, mono, and bridged mono operating modes. Continuous average output power: 650W/ch @ 8 ohms, 1050W/ch @ 4 ohms, 1600W/ch @ 2 ohms, 2100W @ 8 ohms bridged, and 3200W @ 4 ohms bridged. Maximum output power: 800W/ch @ 8 ohms, 130W/ch @ 4 ohms, 2000W/ch @ 2 ohms, 2600W @ 8 ohms bridged, and 4000W/ch @ 4 ohms bridged.

High-Efficiency Design
The M-4000 uses 3-rail Class-H circuitry, which taps into additional power rails only when needed. This results in much greater efficiency and less destructive heat. So it runs very cool versus other types of power amp designs, especially in real-world applications playing real music. This design not only maximizes power, but also improves long-term reliability.

Fast Recovery Circuitry
Borrowing from technology found only in high-speed test equipment, the M-4000 employs Fast Recovery circuitry with Baker Clamps. The Baker Clamps prevent both the output stage and final Class-A voltage amp stage from saturating--a phenomenon known as "sticktion," where the amplifier delays its recovery past the original input clipping point. When recovery finally does take place, it can be abrupt and generate a massive amount of higher-order harmonic distortion.

Fast But Remarkably Un-Furious Transients
The faster an amplifier's rate of slew, the better its transient response, the faster its recovery from clipping, and the less risk of slew-induced harmonic distortion through the entire audio band. Mackie's Adaptive Slewing circuitry allows the M-4000 to pass the fastest transient attacks--like kick and snare drum or any bass player trying to imitate Marcus Miller--while minimizing Class-H switching distortion. So no matter how hard and fast you thrash, the M-4000 is gonna be a couple of steps ahead, making sure the output is clean.

50% More Output Components
Check out the competition, and you'll find the M-Series amps typically use 50% more output parts for the same power output levels. The M-4000 uses 16 output transistors per channel for extremely hot environments--like a punk show where one amp is driving a real-world 2-ohm load, like 8 speaker cabinets.

Low Feedback/Low Distortion
In addition to the high-efficiency design, advanced filters, and adaptive slewing, the M-4000 features triple Darlington output stages, purely resistive loading of all voltage amplifier stages, and fully complementary/differential design from amplifier input to output--all working together to give the M-4000 some of the lowest distortion numbers of any manufacturer, without having to resort to substantial amounts of negative feedback.

Internal and External Protection
Amplifier reliability comes from both robust design and internal and external protection. Internally, the M-4000 features power supply over-temperature protection, low voltage/brownout protection, extensive fusing, and fusible resistors throughout. Each channel features output DC offset protection, over-temperature protection, Input Slew clamping, and extensive Output stage protection. On the external side of things, the M-Series power amps are designed to withstand bumps, drops, and twists of fortune.