McIntosh MC252 - Manuals

McIntosh MC252 – Manual in PDF format online.

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Manual

Manual McIntosh MC252

Summary

Page 2 - IMPORTANT SAFETY

2 IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. The lightning flash with arrowhead,within an equilateral triangle, is intendedto alert the user to the presence o...

Page 3 - Please take a short time to read the information in this; Caution: The MC252 Amplifier weight is 94.5 pounds

3 Customer Service Technical Assistance Please Take A Moment Thank You Copyright 2003  by McIntosh Laboratory, Inc. The serial number, purchase date and McIntosh Dealername are important to you for possible insurance claim orfuture service. The spaces below have been provided foryou to record that ...

Page 4 - Connector Information

4 Performance Features Introduction • Power Output The MC252 consists of two separate power amplifier chan-nels, each capable of 250 watts into 2, 4 or 8 ohm speakerswith less than 0.005% distortion. The two channels can becombined into a single channel with 500 watts into 1, 2, 4,8 or 16 ohm speake...

Page 6 - Always provide adequate; Installation

6 Installation Caution: The MC252 Amplifier weight is 94.5 pounds (42.87 kilograms). It requires two or more personsto safely handle when moving the amplifier. The MC252 can be placed upright on a table or shelf,standing on its four feet. Thefour feet may be removedfrom the bottom of theMC252 when i...

Page 7 - Top Panel Connections and Switch

7 Top Panel Connections and Switch Connect the MC252power cord to a liveAC outlet. Refer toinformation on theback panel to deter-mine the correctvoltage BALANCED INPUTS foran audio cable from apreamplifier or controlcenter audio outputs RIGHT Channel OUTPUTsconnections for 2 ohm, 4 ohmand 8 ohm Loud...

Page 8 - How to Connect in Stereo

8 Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC252Amplifier until after the Loudspeaker Connectionshave been made and the supplied protectiveTerminal Connection Covers have been installed.Failure to observe this could result in ElectricShock. 1. For Remote P...

Page 10 - How to Connect in Mono Bridged Mode

10 Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC252Amplifier until after the Loudspeaker Connectionshave been made and the supplied protectiveTerminal Connection Covers have been installed.Failure to observe this could result in ElectricShock. There are two ...

Page 11 - Mono Bridge Hookup Conne ctions

11 How to Connect in Mono Bridged Mode To AC Outlet 4 ohmLoudspeaker McIntosh C45 Audio Control Center MC252 Top Rear View Mono Bridge Hookup Conne ctions Louds pe ake r Impe dance Louds pe ake r N egative (-) Conne ction Louds pe ake r Pos itive (+) Conne ction 4 S (Ohm) Left Outp ut 2 S Positive (...

Page 12 - Caution: The supplied AC Power Cord should not be; Choose the appropriate Mono Mode determined by the; Note: An optional hookup is to use balanced cables.; Insert the Loudspeaker Hookup Cable Ends through; WARNING: Loudspeaker terminals are hazardous live

12 Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC252 Amplifieruntil after the Loudspeaker Connections have beenmade and the supplied protective TerminalConnection Covers have been installed. Failure toobserve this could result in Electric Shock. There are two...

Page 13 - Attach the supplied Terminal Connection Covers with; Note: The illustration in figure 9 is for the purpose of; Connect the MC252 power cord to an active

13 How to Connect in Mono Bi-Amp (Parallel) Mode Mono Bi-Amp (Parallel) Hookup Connections Louds pe ake r Impe dance Louds pe ake r Ne gative (-) Conne ction Louds pe ake r Pos itive (+) C onne ction 1 S (Ohm) Left and Right O ut p ut 2 S Negative (- ) Connect ion Left and Right Out p ut 2 S Positiv...

Page 14 - Front Panel Displays and Controls

14 Front Panel Displays and Controls METER indicates thePower Output of the LeftChannel Amplifier METER Switch selectsthe display modes of thePower Output Meter POWER GUARD LEDlights when the amplifierRight Channel POWERGUARD circuit activates POWER Switch TurnsAC power On/Off, orOn/Remote Remote On...

Page 15 - Power On; Note: There must be a power; Meter Selection; Note: There is additional

15 How to Operate How to Operate Power On To have the MC252 automatically turn On or Off when acontrol center turns on or off,rotate the power switch to theremote position. For manual op-eration, rotate the power switchto the On or Off position as de-sired. Refer to figure 10. Note: There must be a ...

Page 16 - Technical Description; A continuous average power output rating of 250 watts

16 Technical Description McIntosh Laboratory, the company who introduced theworld’s first amplifier that could be called “High Fidelity”,has done it again. The McIntosh engineering staff has cre-ated a power amplifier without compromise, using the mostadvanced McIntosh circuit design concepts. A con...

Page 17 - The output signal of the circuit is coupled together in; Block Diagram of the Amplifiers

17 Technical Description rent gain over the entire current range they must cover.Output transistors in particular, have matched uniform cur-rent gain, high current-bandwidth product and large activeregion safe operating area. An automatic tracking bias sys-tem completely eliminates any trace of cros...

Page 18 - The Autoformer creates an ideal match between the

18 Figure 19 With Power Guard Figure 18 Without Power Guard Figure 17 Input Test Signal Figure 16 lower than optimum, causes more output current to flow,which results in extra heat being generated in the poweroutput stage. This increase in temperature will result in areduced life expectancy for the ...

Page 19 - Technical Description, con’t; Power Supply Circuits; Block Diagram; The MC252 can provide greater than 50 amperes peak

19 Technical Description, con’t tronic attenuator at the amplifier input reduces the inputvolume just enough to prevent any further increase in dis-tortion. The Power Guard circuit acts so fast that there areabsolutely no audible side effects and the sonic purity ofthe music reproduction is perfectl...

Page 21 - Notes

Page 22 - 12dB below rated output; Note: Refer to the rear panel of the MC252 for the correct

22 Specifications Specifications Power Output Stereo Minimum sine wave continuous average power output perchannel, all channels operating is:250 watts into 2 ohm load250 watts into 4 ohm load250 watts into 8 ohm load Power Output Mono Bridged Minimum sine wave continuous average power output is:500 ...

Page 24 - Chambers Street

McIntosh Part No. 040815 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, NY 13903 The continuous improvement of its products isthe policy of McIntosh Laboratory Incorporatedwho reserve the right to improve design withoutnotice. Printed in the U.S.A.