McIntosh MC 7300 Brochure
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Page 1
The Mclntosh "Always In Style" TIMELESS LOOKS PEAK PERFORMANCE OPTIMUM DEPENDABILITY CLASSIC DESIGN The classic appearance of a Mclntosh amplifier complements any home decorative scheme. Each component is selected for durability, as well as aesthetics. Consider the construction and materials used in the front panel and knobs. Reverse silk-screened with thermal setting epoxy screen inks, the glass panels are meticulously hand inspected and are free from bubbles, flow marks and other faults. Anodizing, an electro-chemical process that leaves a color dyed and hardened surface impervious to attack from common household cleaning fluids, oils and acids from the skin, is used on the panel frame and aluminum knobs to maximize their resistance to wear. This handsome combination of glass, anodized aluminum, and thermal setting epoxy inks requires very little maintenance to keep the MC7300 look- ing brand new. Its subtle yet sophisticated styling will remain in good taste throughout the years. Rear view Mclntosh Quality Begins With Careful Design For Cool Operation An amplifier's life can be cut short without the pro- per ventilation for cool operation. In fact, as little as one degree centigrade rise in temperature can reduce the life of an amplifier by 10%. Mclntosh has designed its amplifiers to maximize trouble- free cool operation. Output stages are mounted on super-sized heat sinks that have maximum surface areas of cooling capability. The sinks are placed in an air tunnel chassis that occupies the amplifier space from top to bottom. Cooling air, which flows through the air tunnel, dissipates life-limiting heat. This heat dissipation capability is coupled with a chassis construction that encourages ventilation. A Mcln- tosh designed and manufactured autotransformer matches the transistor output circuit to the loudspeakers. The Mclntosh output circuit uses 20 metal cased bipolar epitaxial power transistors and 4 metal cas- ed driver transistors. The output transistors feature high fT (gain - frequency product) and large SOA (safe operating area). The power transistor characteristics, the power supply voltage used, and the output autoformer ratio have been matched for high efficiency, maximum power output with low distortion, and reliable long life operation. Versatile Mclntosh Power Amplifiers Deliver Full Power - Always The Mclntosh output circuit, superior in its perfor- mance, demands a superior method of coupling the amplifier output to the loudspeaker load. A Mclntosh designed and manufactured autotransformer ensures peak performance and protection, as well as outstanding compatibility between amplifier and speaker. The Mclntosh autotransformer offers these benefits: - Transistors, used in amplifier output circuits, are designed to work into an optimum low im- pedance load. Variations in frequency, or the use of multiple speakers (which modify the im- pedance as seen by the output of the amplifier), often compromise an amplifier's performance. The Mclntosh autotransformer prevents these variables from causing restricted performance, output transistor heating, and/or circuit failure. - In the event of an output circuit failure, the Mclntosh autotransformer conducts the speaker- damaging DC (direct current) directly to ground, thus protecting expensive loudspeakers from potential damage. - The Mclntosh autotransformer contributes a flex- ibility in loudspeaker connecting capability not otherwise possible. Here's how: Ordinary amplifier output circuits are usually restricted to operating in 4 or 8 ohms. In stereo, the Mclntosh autotransformer perfectly matches the output circuit to 2. 4, or 8 ohms. In mono the MC7300 autotransformers provide matching into 1, 2, 4, 8 or 16 ohms. In addition, the autotransformer can provide either a 25 volt or a 70.7 volt output that can feed multiple loudspeakers for background music applications. Heat sinks
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The Mclntosh autotransformer is, quite simply, an engineering advance that enhances amplifier performance while maintaining technical and per- formance integrity. Mclntosh's Exclusive Power Guard™ Music Protection Circuit Improved recording techniques have imposed higher power demands on today's amplifiers. Other amplifier designs, of which there are many, can present music listeners with unpleasant distortion due to amplifier overload (hard clipping). Clipping, which looks and acts like non-musical square waves (music produces rounded waves), is caused when the amplifier is required to produce more power output (with low distortion) than it is designed to deliver. Amplifiers, when driven to clip- ping, can deliver up to 40% harmonic distortion- distortion that significantly decreases listening en- joyment, and increases listening fatigue. A clipped Top interior view signal also produces extra distortion energy, which can damage speakers. Mclntosh precision engineering has developed the Power Guard circuit* to prevent amplifiers from be- ing overdriven into hard clipping; ensure that the amplifier produces its maximum output without in- creased distortion; and protect the speaker from excessive heating. (*Power Guard is a patented Mclntosh design, U.S. patent #4048573) Compact discs have a higher 'dynamic range' over records and audio cassettes. Most compact discs claim a dynamic range in excess of 90 decibels. In numerical ratio this is greater than 1000 times the ratio of popular commercial analog records. For equipment to be digital ready it must handle overdrive without breaking up or grossly distorting the sound. Virtually all power amplifiers today are incapable of accepting 10 decibels of overdrive without gross distortion. Some amplifiers totally collapse under this punishment. Mclntosh has devised a test which shows an amplifier's spectral fidelity under stress -- one of the most important characteristics of an amplifier. Every detail of the complicated panel is inspected and re-inspected. The harmonic distortion and two-tone intermodula- tion measurements are important criteria in predic- ting the sonic performance. However, to obtain better correlation with human hearing response, we need to know not only the energy in the distor- tion spectrum, but also the number of discords and their frequency spacing from the desired tones. Spectral fidelity testing enlarges the scope of data and more fully clarifies its meaning. It is no accident, then that a Mclntosh amplifier is a smart investment, one that will fill your home with years of audio excitement: - It is more reliable than other amplifiers - It has a longer, trouble-free life than other amplifiers - It sounds better than other amplifiers - Its resale value is the highest of all amplifiers Mclntosh Patented Power Meters In the past, ordinary power meters have been in- capable of indicating the short interval information in a soundwave, which can have a duration of one- half of one thousandth of a second. And even if a meter were capable of such high velocity move- ment, the human eye would be unable to perceive the information. Mclntosh engineering solved the dilemma by developing an electronic circuit that power meters can respond to with an accuracy of 98%. These cir- cuits are time-stretched, which allows the meter pointer position to register in such a way that the human eye can register its high-speed motion. The patented peak-reading, peak-locking meter cir- cuit included in the MC7500 is yet another Mclntosh electronic design feature that maximizes your audio pleasure. . .and makes the MC73OO a sound investment. If good enough will do, there are dozens of brands to choose from. But if the best is what you need there is only one to consider: The Mclntosh MC73OO.