Power Amplifier MC1.2KW Owner’s Manual McIntosh Laboratory, Inc.
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Read these instructions. 2. Keep these instructions. 3.
Thank You Table of Contents Your decision to own this McIntosh MC1.2KW Power Amplifier ranks you at the very top among discriminating music listeners. You now have “The Best.” The McIntosh dedication to “Quality,” is assurance that you will receive many years of musical enjoyment from this unit. Please take a short time to read the information in this manual. We want you to be as familiar as possible with all the features and functions of your new McIntosh. Safety Instructions ...........................
Connector Information, Introduction and Performance Features Connector and Cable Information XLR Connectors Below is the Pin configuration for the XLR Balanced Input Connectors on the MC1.2KW. Refer to the diagram for connection: PIN 1: Shield/Ground PIN 2: + Output PIN 3: - Output PIN 2 PIN 1 PIN 3 Power Control Connector The MC1.2KW’s Power Control Inputs receive On/Off signals of +5 volts. An additional connection is for controlling the illumina- Power Control tion of the MC1.
Dimensions Dimensions The following dimensions can assist in determining the best location for your MC1.2KW. There is additional information on the next page pertaining to installing the MC1.2KW into cabinets. 17-3/4" 45.09cm 11" Front View of the MC1.2KW 27.94cm 12-5/16" 31.27cm 17-3/8" 44.15cm Rear View of the MC1.2KW 12-1/4" 31.11cm 19-1/2" 49.50cm 18" 1-5/8" 45.72cm 4.12cm 10-1/2" Side View of the MC1.2KW 3/16" 0.48cm 1-1/2" 3.81cm 14" 35.60cm 26.70cm 1-9/16" 3.
Installation Installation out a ventilation hole in the mounting shelf according to The MC1.2KW can be placed upright on a table or shelf, the dimensions in the drawing. standing on its four feet. It also can be custom installed in a piece of furniture or cabinet of your choice. The four 1 When the MC1.2KW is installed together with other McIntosh feet may be removed from the bottom of the MC1.2KW Components, check clearances on all components before when it is custom installed as outlined below.
Rear Panel Connections and Switch Circuit Breaker, press to reset if the amplifier will not power up BALANCED INPUT1 / OUTPUT for an audio cable from a Preamplifier output or to connect an audio cable onto the next Power Amplifier input INPUT MODE switch selects between balanced or unbalanced input OUTPUT Connections for 2 ohm Loudspeaker BALANCED INPUT for an audio cable from a Preamplifier or A/V Control Center audio output POWER CONTROL IN receives turn On/Off signal from a McIntosh component and th
How to Connect Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC1.2KW Amplifier until after the Loudspeaker Connections have been made and the supplied protective Terminal Connections Cover has been installed. Failure to observe this could result in Electric Shock. 1. For Remote Power Control, connect a power control cable from the Control Center or Preamplifier Power Control Out to the MC1.2KW POWER CONTROL IN. 2.
How to Connect McIntosh Preamplifier Connect to AC Outlet McIntosh Loudspeaker 9
How to Connect for Bi-Amp Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC1.2KW Amplifier until after the Loudspeaker Connections have been made and the supplied protective Terminal Connections Cover has been installed. Failure to observe this could result in Electric Shock. 1. For Remote Power Control, connect a power control cable from the Control Center or Preamplifier Power Control Out to the MC1.2KW (Amplifier One) POWER CONTROL IN. 2.
How to Connect for Bi-Amp McIntosh Preamplifier Connect to AC Outlet Connect to AC Outlet McIntosh Amplifier Two McIntosh Amplifier One Cover Mounting Screw Location Terminal Connections Cover Rear Chassis Handle Cover Mounting Screw Location McIntosh Loudspeaker Cable Openings Figure 7b (Outside USA and Canada) 11
Front Panel Displays and Switches Meter indicates the Power Output of the Amplifier LED indicates when Amplifier POWER GUARD circuit activates Standby Power On Indicator METER Switch selects the display modes of the Power Output Meter and Meter Illumination 12 POWER Switch Turns AC Power On/Off, or On/Remote
How to Operate How to Operate Power On To have the MC1.2KW automatically turn On or Off when a control center turns on or off, rotate the power switch to the remote position. For manual operation, rotate the power switch to the On or Off position as desired. Refer to figure 8. Note: There must be a power control connection between the MC1.2KW and the McIntosh Control Center, in order for the remote power turn-on to function.
Technical Description McIntosh Laboratory, the company who introduced the world’s first amplifier that could be called “High Fidelity”, has done it again. The McIntosh engineering staff has created a power amplifier without compromise, using the most advanced McIntosh circuit design concepts. A continuous average power output rating of 1,200 watts and with an output current of 200 amperes, makes this not only the most advanced, but also the most powerful amplifier McIntosh has ever manufactured.
Technical Description cies is less than 0.002%. The true distortion readings on the MC1.2KW are so low, it takes special measuring techniques to make accurate readings. The MC1.2KW can deliver the best possible performance from any type of high quality loudspeaker system. Creating an amplifier with this level of performance did not come easily. Many months of design, testing and measuring were required.
Autoformers All solid state power amplifier output circuits work best into what is called an optimum load. This optimum load may vary considerably from what a loudspeaker requires. In the case of more than one loudspeaker connected in parallel, the load to the power amplifier may drop to two ohms or even less. A power amplifier connected to a load that is lower than optimum, causes more output current to flow, which results in extra heat being generated in the power output stage.
Technical Description, con’t audible and inaudible distorWithout Power Guard tion levels exceeding 40%. The audible distortion is unpleasant to hear, but the inaudible ultrasonic distortion is also undesirable, since it can damage valuable loudspeaker system tweeters. You will never experience the harsh and damaging distortion due to clipping. The Power Guard circuit is a waveform comparator, moniFigure 18 toring both the input and output waveforms.
Specifications Specifications Power Output Minimum sine wave continuous average power output is: 1,200 watts into 2 ohm load 1,200 watts into 4 ohm load 1,200 watts into 8 ohm load Output Load Impedance 2, 4 or 8 ohms Rated Power Band 20Hz to 20,000Hz Total Harmonic Distortion 0.005% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20,000Hz Dynamic Headroom 2dB Frequency Response +0, -0.
Packing Instructions Packing Instructions In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as shown below. It is very important that the four feet are attached to the bottom of the equipment. This will ensure the proper equipment location on the bottom foam pad. Failure to do this will result in shipping damage. Use the original shipping carton and interior parts only if they are all in good serviceable condition.
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, NY 13903 The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in the U.S.A. McIntosh Part No.
