McIntosh MC 2150 Brochure
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The MC 2155...150 WATTS OF PURE PERFORMANCE The McIntosh reputation for QUALITY is acknowledged world wide: quality performance, quality appearance, quality manufacture, and quality protection. Each com- ponent selected for use in a McIntosh is quality tested not only for performance but for maintain- ing that performance over the long life expected of a McIntosh. At McIntosh, everyone and everything is dedicated to con- tinuation of proven-McIntosh quality. Since 1949, McIntosh has con- tinuously expanded the boun- daries of power amplifier technology and performance with the introduction of each new design. What is considered to be "State of the Art" has been the starting line for McIntosh re- search, research that responds to the demands for quality perfor- mance improvements. The U.S. Patent Office has granted McIntosh 30 patents which recognize these unique and pace setting electronic designs. Current McIntosh amplifiers use one or more of these U.S. Patents: 4,065,682; 4,048,573; 3,526,847; and 3,526,846. But, patents only verify the engineering superiority and design integrity. Quality is the desire that is expressed in performance pro- mised - and delivered-over a long trouble-free life. McIntosh superior quality has been long recognized world wide. MCINTOSH QUALITY BEGINS WITH CAREFUL DESIGN FOR COOL OPERATION To achieve long trouble-free life in an amplifier it is essential to have cool operation. As little as one degree (centigrade) rise in temperature can reduce the operating life of the amplifier 10%. McIntosh has extended the life of its amplifiers by engineer- ing for cool operation. McIntosh cool operation requires a com- bination of careful design of the output circuit, containing the out- put circuit in a mechanical hous- ing that permits the use of gener- ous sized heat sinks to provide great heat dissipation capability along with chassis construction that permits adequate ventilation, then correctly matching the cool operating output circuit to the loudspeakers with a McIntosh designed and manufactured auto- transformer. The McIntosh output circuit uses bipolar epitaxial output tran- sistors in a cleverly inventive design that keeps the circuit com- ponents cool, extending the long trouble-free life of the com- ponents. The circuit has the abili- ty to recognize the power demands of the program material and then to activate only as much of the output circuit as is needed to satisfy that demand. All this oc- curs without the crossover distor- tion found in conventional solid state output circuits. (The amplifier circuit is a patented McIntosh design U.S. patent #3526847.) The McIntosh output stages are mounted on heat sinks that have 772 square inches of cooling cap- ability, the largest for equivalent power in the industry. The super sized heat sinks are placed in an air tunnel chassis design that oc- cupies the entire space from the bottom of the amplifier to the top.
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Cooling air, flowing through the air tunnel, easily dissipates any life limiting heat generated. THE MCINTOSH (EXCLUSIVE) POWER GUARD MUSIC PROTECTION CIRCUIT Improved recordings and recording techniques have impos- ed higher power demands on to- day's amplifiers. Poorly designed amplifiers, of which there are many, can present music listeners with a form of harsh unpleasant distortion due to amplifier over- load {hard clipping). Clipping, which looks and acts like non musical square waves, is caused when the amplifier is asked to produce more power output with low distortion than it is capable of or designed to deliver. Amplifiers, when driven to clipping, can de- liver up to 40% harmonic distor- tion. Distortion decreases the Oscillogram of output waveform with and wilhout Power Guard. Input overdriven for each trace 20 dB. pleasure and enjoyment of listen- ing. This form of distortion (clip- ped signal) also produces extra heat energy which will damage most speakers. McIntosh leader- ship in engineering has developed the Power Guard circuit which-(1) dynamically prevents power amplifiers from being over- driven into hard clipping-(2) assures that the amplifier will produce its maximum output without increased distortion-(3) protects your speaker from exces- sive heating. Power Guard is a patented McIntosh design (U.S. patent #4,048,573). THE McINTOSH POWER METERS The lack of accurate perfor- mance in ordinary meters has presented difficult and complex problems. Ordinary meters are incapable of indicating the short interval information in a sound wave. The mass of the meter movement is too great to respond to the nearly instantaneous changes in music program material. That short interval information can have a duration as short as one-half of one thousandth of a second. Even if the meter were capable of such high velocity movement, the human eye could not perceive the information. McIntosh engineering solved both problems electrically. By developing new electronic cir- cuits the meters are made to res- pond to short intervals with an ac- curacy of 98%! To permit the eye to see such high speed motion, the electronic circuits that drive the meter pointer are time stretched so the meter pointer position can register in the persistence of vi- sion characteristics of the human eye. The peak-reading, peak- locking meter circuit is a patented McIntosh design (U.S. patent #4,065,682). A variety of information can be displayed on the meters. You may elect to observe the delivered power in watts demanded by the musical program or you may elect to lock and hold only the highest power indications yet have con- tinuous updating as higher powers are delivered or you may select from three different peak-reading, peak-locking decibel indications. Each selected function is in- dicated by illuminated nomenclature on the panel. THE MCINTOSH AUTOMATIC TEST SYSTEM The McIntosh Automatic Test System provides positive perfor- mance protection and extends the long trouble-free life of an amplifier. Each time the amplifier is turned on, the Automatic Test System electronically measures and verifies accurate perfor- mance at seven critical points in the amplifier's circuits. The Auto- matic Test System verification assures operational readiness before operation starts and limits any damage should there be com- ponent malfunction. Each time a test is verified an LED number in- dicator shows which test is being performed. This Automatic Test System protects your investment. THE MCINTOSH "ALWAYS IN STYLE" The appearance of a McIntosh speaks eloquently of precision, quality, premier performance and long, trouble-free life. Consider the construction and materials used in the front panel and knobs. Each constituent part is selected for long, wear-resistant life and stable attractive styling. The panel of the MC 2155 is select glass, free from bubbles, flow marks and other faults. It is silk screened on the reverse side with thermal setting epoxy screen inks which practically become a part of the glass. Then it is built into a brightly polished and anodized frame. The knobs used are meticulously machined of solid aluminum then anodized and ther- mally and electrically isolated. Anodizing is an electro-chemical process that leaves a color dyed and hardened surface that is im- pervious to attack from common household cleaning fluids, oils and acids from the skin and is highly wear resistant. This handsome combination of glass, anodized aluminum and epoxy requires very little maintenance to keep that, "Just new" appearance. The subtle yet sophisticated styling is designed to complement any decorative scheme and will remain in "good taste". The MC 2150 front panel is an attractive combination of textured anodized aluminum and baked enamel. The knobs are machined of solid aluminum then anodized for permanence. INSTALLATION WITH THE MC2155 The quality performance, quality appearance, qualify manufacture and quality protection described for the MC 2155 are repeated in the MC 2150. The "Pro-Panel" has an attractive baked enamel and gold anodized finish. Its versatility permits ease of custom installation, in- stallation in the McIntosh furniture cabinet or can be easily converted to pro- fessional rack mounting with The deletion of the meters and and circuits are the only high performance models.