Figure 18
With Power Guard
Without Power Guard
Figure 17

Technical Description, con’t

able, since it can damage valuable loudspeaker sys- tem tweeters. You will never experience the harsh and damaging dis- tortion due to clipping.

The Power Guard cir- cuit is a waveform com- parator, monitoring both the input and output waveforms. Under nor- mal operating conditions, there are no differences between the shape of

these waveforms. If an amplifier channel is overdriven, there will be a difference between the two signal wave- forms. When the difference exceeds 0.3% (equivalent to 0.3% harmonic distor-

tion), the Power Guard activates the PG light and a dynamic electronic at- tenuator at the amplifier input reduces the input volume just enough to prevent any further in- crease in distortion. The Power Guard circuit acts so fast that there are ab- solutely no audible side effects and the sonic pu- rity of the music repro- duction is perfectly pre-

served. The MC1201 Power Amplifier with Power Guard is not limited to just the rated power output, but will actu-

ally produce distortion free output well above its rated power due to the McIntosh philosophy of conservative de- sign.

Power Supply Circuits

To compliment the fully balanced design of the MC1201 there are two high voltage power supplies; one for each of the two amplifier circuits, allowing each amplifier circuit to be optimized using its own power supply. Refer to figure

19.High power amplifiers draw high current from the AC power line. Therefore, it is important that they plug directly into the wall outlet.

Also, most owners desire that there be one power switch for the whole audio system. The MC1201 is equipped with a circuit that provides remote Power Control from your McIntosh Preamplifier or Control Center. When you turn on your preamplifier a digital “1” (+5V) signal operates the power relay in the MC1201. The MC1201 also has a remote Power Control Out Jack. The Power Control signal from this jack is delayed by a fraction of a second so that the turn on power surge of the next power amplifier occurs at a later time. This helps prevent power circuit overload that could trip circuit breakers or blow fuses, a very important feature in a high power Home Theater Sys- tem employing three MC1201 Power Amplifiers.

The MC1201 can provide greater than 200 amperes peak output current to drive uneven speaker loads. Some poor speaker designs have input impedance that dip to 1 or 2 ohms at various frequencies and the MC1201 has the out- put current reserve to drive them. It can deliver over 1,000 Watts Output on tone bursts. The MC1201 has huge main filter capacitors that guarantee an excellent signal to noise ratio and the energy storage necessary for the wide dy- namic range that “Digital Audio” demands.

Block Diagram

of the

Power Supply

Figure 19

15

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McIntosh MC1201 manual Technical Description, con’t, Power Supply Circuits
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MC1201 specifications

The McIntosh MC1201 is a high-performance monaural amplifier that exemplifies the brand’s commitment to delivering exceptional audio quality and performance. Known for its robust build and advanced technology, the MC1201 is designed to impress audiophiles and music professionals alike.

At the core of the MC1201 is a power output of 1,200 watts, allowing it to effortlessly drive even the most demanding speakers. The amplifier features McIntosh’s renowned Autoformer technology, which ensures that the full power is available regardless of the speaker's impedance. This technology helps in maintaining sound quality and performance across various load conditions, making the MC1201 versatile for different audio setups.

One of the standout characteristics of the MC1201 is its unique Circuit Design, including the use of McIntosh's exclusive Power Guard system. This innovative technology monitors the output to prevent distortion, safeguarding both the amplifier and connected speakers from damage during high-volume playback. This feature is especially beneficial for those who push their audio systems to the limits, providing peace of mind without sacrificing sound quality.

The MC1201 also incorporates the company’s proprietary Sentry Monitor, a protection circuit that ensures the amplifier operates safely under all conditions. If the output current exceeds safe levels, the Sentry Monitor will engage and temporarily reduce power output, allowing the amplifier to cool down and return to normal operation.

In addition to its powerful performance, the MC1201 boasts an aesthetically pleasing design. It features a sleek black glass front panel, illuminated meters that provide a visual representation of the audio output, and the iconic McIntosh logo, which signifies quality and luxury. The high-quality build ensures longevity and reliability, essential for both home audio enthusiasts and professional settings.

With its combination of power, advanced technology, and meticulous craftsmanship, the McIntosh MC1201 remains a sought-after choice for those seeking top-tier amplification solutions. Whether used in a home theater system or a high-fidelity audio setup, the MC1201 delivers an unparalleled listening experience, exemplifying McIntosh’s dedication to excellence in audio engineering.
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