Design Philosophy

Figure 13

Technical Description

cies is less than 0.002%. The true distortion readings on the MC1.2KW are so low, it takes special measuring techniques to make accurate readings. The MC1.2KW can deliver the best possible performance from any type of high quality loudspeaker system.

Creating an amplifier with this level of performance did not come easily. Many months of design, testing and mea- suring were required. Extensive controlled listening tests, the ultimate form of measuring, were made before the final design was accepted.

The design philosophy incorporated in the MC1.2KW involved several different techniques, all based on sound scientific logic. Every stage of voltage or current ampli- fication must be as linear as possible prior to the use of negative feedback. McIntosh engineers know how to prop- erly design negative feedback circuits so they contribute to the extremely low distortion performance expected from a McIntosh amplifier. The typical McIntosh owner would never accept the approximately 100 times higher distortion of many non-feedback designs.

Double Balanced Push-Pull design is used from input to output. Each half of the amplifier contains complimentary balanced circuitry. The resulting double balanced configu- ration cancels even order distortion. Refer to figure 12.

All transistors are selected to have nearly constant current gain over the entire current range they must cover. Output transistors in particular, have matched uniform current gain, high current bandwidth product and large

active region safe operating area. An automatic tracking bias system completely eliminates any trace of crossover distortion. Precision metal film resistors and low dielectric absorption film capacitors are used in all critical circuit locations.

The output signals of the two balanced circuits are

coupled together in the unique McIntosh MC1.2KW Out- put Autoformer. It provides low distortion power transfer at frequencies from below 20Hz to well beyond 20,000Hz with optimum impedance points of two ohms, four ohms and eight ohms. The unequaled expertise of McIntosh in the design and manufacturing of autoformers is legendary in the high fidelity industry.

The high ef- ficiency circuit de- sign of the MC1.2KW contrib- utes to low operating tempera- tures. More than 2800 square inches of heat sink

area keep the MC1.2KW operating safely with convection cooling. No fans are needed. Refer to figure 13.

Block Diagram

of the

Power Amplifier

(one channel shown)

Figure 12

MC1.2KW specifications

The McIntosh MC1.2KW is a powerful monoblock amplifier designed for audiophiles who demand top-tier performance and precision. With a robust power output of 1,200 watts into an 8-ohm load and a staggering 2,400 watts into a 4-ohm load, this amplifier is engineered to drive even the most demanding loudspeakers with ease. The MC1.2KW exhibits impressive dynamic range, making it an ideal choice for reproducing both subtle nuances and explosive crescendos in music.

One of the standout features of the MC1.2KW is its use of McIntosh's advanced Autoformer technology. This transformer allows the amplifier to deliver full power regardless of the speaker impedance, which ensures that users can connect it to a wide range of speaker systems without sacrificing performance. This provides versatility and reliability, as it can effortlessly transition between different speaker loads.

Another key characteristic of the MC1.2KW is its unique Power Guard system. This technology continually monitors the audio signal and adjusts the output to protect both the amplifier and connected speakers from distortion and clipping. This protection processes help ensure that listeners enjoy an uncompromised audio experience, while also prolonging the lifespan of the equipment.

The MC1.2KW features a sleek and elegant design, complete with McIntosh's iconic glass front panel and illuminated logo. The distinctive blue watt meters not only add a touch of aesthetic appeal but also offer a visual representation of the amplifier's output, allowing users to monitor performance at a glance.

Additionally, the unit is equipped with a balanced input and a high-quality 12V trigger, allowing for seamless integration into any high-end audio system. The robust build quality, coupled with meticulous craftsmanship, ensures that the MC1.2KW can withstand the rigors of everyday use while delivering impeccable sound quality.

In conclusion, the McIntosh MC1.2KW monoblock amplifier merges cutting-edge technology with stunning design to provide audiophiles with an unparalleled listening experience. Its powerful output, versatility, and innovative features set it apart in the competitive world of high-fidelity audio. Whether for music enthusiasts or serious home theater setups, the MC1.2KW stands as a testament to McIntosh's dedication to superior sound reproduction.