MA6850/MA6800 Integrated Amplifiers
See “SYSTEMS ENGINEERING” in main brochure for more on McIntosh system architectures.
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The patented McIntosh Power Guard provides real-time clipping protection without affecting power output or sound quality.
a)test signal
b)overdriven amp without Power Guard produces SEVERE clipping
c)overdriven amp with Power Guard produces NO clipping
MA6850/MA6800
Integrated Amplifiers
MA6850
Those considering a McIntosh system for the first time will find integrated amplifiers a comfortable place to start. In virtually every respect the MA6850 and MA6800 perform as well as McIntosh separates. Both models incorporate premium McIntosh technologies – including autoformers, Power Assurance, and Silent Electromagnetic Switching – as well as several features that facilitate system
integration and expansion.
Featured Technologies
EXCLUSIVE MCINTOSH OUTPUT AUTOFORMERS. An impedance mismatch between a power amplifier and a loudspeaker can cause distortion and a reduction in power. The legendary McIntosh autoformer is a hand-crafted transformer with output connections for 2, 4, and 8 ohms, allowing an ideal impedance match between amp and speaker. A McIntosh amplifier with an autoformer can also safely drive multiple speakers connected in parallel without shortening the life of the output stage. There is absolutely no performance penalty with an autoformer. In fact, its frequency response exceeds that of the output circuit itself, and extends well beyond the audible range. Distortion is so low it is virtually immeasurable.
EXCLUSIVE MCINTOSH POWER ASSURANCE SYSTEM. Power Assurance is a collection of technologies that enhance performance and reliability and protect the amp and the loudspeakers.
Power Guard® clipping protection. Power Guard ensures that the amplifier will always deliver full power without causing clipping distortion. If an amplifier channel is overdriven, Power Guard automatically reduces the input volume just enough to keep distortion below 2% and prevent any clipping distortion. Thanks to an optical resistor, Power Guard acts literally at the speed of light, producing absolutely no audible side effects. An amplifier with Power Guard will actually deliver clipping-free output well above its rated power.
Sentry Monitor® current protection. Sentry Monitor continually senses the voltage and current of the output stage and confines it to a safe limit. Sentry Monitor does not limit power output.
Thermal Cutout. If the cooling air is blocked and the power transistors become too hot, thermal cutouts protect against overheating until the amp cools.
DC Failure protection. In the rare event of an output circuit failure, any DC current that appears in the output is shunted to ground by the autoformer, protecting the loudspeakers from damage.
Turn-On Delay. This circuit delays operation for about two seconds after turn-on in order to avoid any pops or thumps generated as other equipment turns on.
Soft Start inrush protection. Thermistors in the power transformer act as a cushion against inrush current, eliminating component stress during turn-on. Soft Start is one of many design details that contribute to the remarkable longevity of McIntosh equipment.
ILLUMINATED PEAK-RESPONDING METERS. McIntosh meters respond 95% full scale to a single-cycle tone burst at 2kHz. Response is almost 10-times faster than a professional VU meter.
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