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Table of Contents
Related Manuals for McIntosh MC 7270
Summary of Contents for McIntosh MC 7270
- Page 2 IMPORTANT SAFETY INSTRUCTIONS THESE INSTRUCTIONS ARE TO PROTECT YOU AND THE MclNTOSH INSTRUMENT. BE SURE TO FAMILIARIZE YOURSELF WITH THEM. 1. Read all instructions - Read the safety and operating instructions before operating the instrument. 2. Retain Instructions - Retain the safety and operating instructions for future reference.
- Page 3 15. Nonuse Periods - Unplug the power cord from the 19. CAUTION: TO PREVENT ELECTRICAL SHOCK DO AC power outlet when (eft unused for a long NOT USE THIS (POLARIZED) PLUG WITH AN period of time. EXTENSION CORD, RECEPTACLE OR OTHER 16.
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Page 4: Table Of Contents
Your MC 7270 Stereo Power Amplifier will give you Contents many years of satisfactory performance. If you have any questions, please contact: INTRODUCTION 3, 4, 5 CUSTOMER SERVICE INSTALLATION Mclntosh Laboratory Inc. HOW TO CONNECT 1, 8 2 Chambers Street... -
Page 5: Introduction 3
The Mclntosh MC 7270 is the first and only amplifier sum and difference of the test tones. These spurious specially designed to fulfill Digital Dynamic Range tones are called Intermodulation Distortion. demands. It outperforms all others when listening to All amplifiers (Mclntosh amplifiers with Power Guard are... - Page 6 In these oscillograms, you can see the difference in Spectral Fidelity between a stressed Mclntosh, and other amplifiers. 1. The Mclntosh stressed 10 dB above full power 2. An imported amplifier stressed 10 dB above full power 3. A domestically manufactured amplifier which had to be tested "under-stressed"...
- Page 7 1, 2, 4, or 8 ohms. The amplifier is rugged and reliable. The mechanical and electrical design of the MC 7270 is the result of the many years of engineering and manufac- turing experience by the designers at Mclntosh.
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Page 8: Installation
(19.1 mm) screws; for panels that are more than 1/2 inch The MC 7270 may be installed in a Mclntosh cabinet or (12.7 mm) thick, use the 1-1/4 inch (31.8 mm) screws. custom installed in furniture of your choice. Always pro- vide adequate ventilation. -
Page 9: How To Connect 7
The cables to and from the speaker should be The MC 7270 will feed a constant voltage line as is often of parallel construction or be loosely twisted together. used in background music applications, paging systems and The chart shows the recommended minimum wire size the like. - Page 10 Left 8 Ohm Terminal Right 8 Ohm Terminal Neither output terminal is at ground potential. To use the MC 7270 to feed a line whose constant voltage is 25 volts, connect the speaker cables for 2 ohm MONO-BRIDGE output. 8 HOW TO CONNECT...
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Page 11: Connections 9
PROGRAM SOURCE STEREOPHONIC CONNECTIONS MUST BE IN LEFT RIGHT S T E R E O POSITION S P E A K E R SPEAKER FOR S T E R E O PROGRAMS PROGRAM SOURCE MONO-BRIDGED CONNECTIONS (CONNECTIONS FOR 8 OHM S P E A K E R ILLUSTRATED) SPEAKER... -
Page 12: Front Panel Controls
METERS Output power monitor meters calibrated in both watts and decibels, indicate the output power of each channel. The upper scale on the meter has been calibrated to show average watts and the lower scale, decibels. Reading from right to left, the marks between the numbers indicating watts are (from the indicated 270 watts): first mark, 108 watts. - Page 13 If you wish to control the AC power from a preamplifier control center, leave the switch in the ON position. Be sure the AC cord of the MC 7270 is plugged into the controlled outlets on the rear of the preamplifier control center.
- Page 14 Power Guard is a patented Mclntosh design (U.S. patent #4048573). The MC 7270 has a circuit that compares the wave shape of the output signal to the input signal. If the disparity between the two signals, due to overdrive, ex- ceeds an average of 0.3% (equivalent to 0.3% total har-...
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Page 15: Rear Panel Information 13
AC POWER The input to the MC 7270 is 120 volts 50/60 Hz at up to 12 amps. The primary circuit is protected by a 15 Amp Fuse. REAR PANEL INFORMATION 13... -
Page 16: Performance Limits
Mclntosh instrument. We pro- output is 540 watts or less per channel with both mise you that when you purchase a new MC 7270 from a Mclntosh franchised dealer, it will be capable of or can be... -
Page 17: Performance Charts 15
0.05 MC 7270 0.04 HARMONIC DISTORTION VS FREQUENCY AT RATED POWER 0.03 0.02 0.01 FREQUENCY IN Hz MC 7270 FREQUENCY RESPONSE AT 1 WATT OUTPUT 100k FREQUENCY IN Hz MC 7270 CHANNEL SEPARATION VS FREQUENCY OUTPUT IMPEDANCE: 8 INPUT IMPEDANCE: 1k... - Page 18 BOTH CHANNELS OPERATING INTO 8 OHMS 20kHz 1kHz 0.03 20Hz 0.02 0.01 1000 POWER OUTPUT IN WATTS MC 7270 POWER OUTPUT VS FREQUENCY 0.02% HARMONIC DISTORTION BOTH CHANNELS OPERATING INTO 8 OHMS 100k FREQUENCY IN Hz 0,06 MC 7270 0.05 INTERMODULATION DISTORTION VS POWER OUTPUT BOTH CHANNELS DRIVEN 0.04...
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Page 19: Technical Description 17
INPUT AMPLIFIER for 1, 2, 4 and 8 ohms. The MC 7270 will deliver full Each channel input contains a complete seven transistor low power amplifier. A differential transistor pair provides power over the entire audio frequency range at any of high input impedance with low noise. - Page 20 These diodes have a uniform logarithmic characteristic over an 80 dB range. Only 60 dB of this logarithmic range is used in the MC 7270. The full wave rectifier circuit uses an operational ampli- fier with silicon diode feedback networks. This amplified diode circuit has nearly perfect rectification characteristics.
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Page 21: Block Diagram 19
BLOCK DIAGRAM 19... - Page 22 XRT 18 Isoplanar Loudspeaker System with optional base stand MR 7082 AM/FM Tuner C 31V Home Entertainment Control Center MC 7270 Power Amplifier Handcrafted with pride in the United States by dedicated, highly trained craftspeople...
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