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Your decision to own this McIntosh MC312 Stereo 

Power Amplifier ranks you at the very top among 

discriminating music listeners. You now have “The 

Best.” The McIntosh dedication to “Quality,” is as-

surance 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 pos-

sible with all the features and functions of your new 

McIntosh.

Copyright 2018 © by McIntosh Laboratory, Inc.

Table of Contents

Thank You

Please Take A Moment

Technical Assistance

If at any time you have questions about your McIntosh 

product, contact your McIntosh Dealer who is familiar 

with your McIntosh equipment and any other brands 

that may be part of your system. If you or your Dealer 

wish additional help concerning a suspected problem, 

you can receive technical assistance for all McIntosh 

products at:

McIntosh Laboratory, Inc.

2 Chambers Street

Binghamton, New York 13903

Phone: 607-723-3512

Fax: 607-724-0549

Customer Service

If it is determined that your McIntosh product is in 

need of repair, you can return it to your Dealer. You 

can also return it to the McIntosh Laboratory Service 

Department. For assistance on factory repair return 

procedure, contact the McIntosh Service Department 

at:
McIntosh Laboratory, Inc.

2 Chambers Street

Binghamton, New York 13903

Phone: 607-723-3515

Fax: 607-723-1917

The serial number, purchase date and McIntosh Dealer 

name are important to you for possible insurance 

claim or future service. The spaces below have been 

provided for you to record that information:
Serial Number: _______________________________

Purchase Date: _______________________________

Dealer Name: ________________________________

Important Safety Information is supplied in a separate document “Important Additional Operation Information Guide

Safety Instructions ..................................................... 2

    (Separate Sheet) ...................

Important Additional

                                    Operation Information Guide

Thank You and Please Take a Moment ....................... 2

Technical Assistance and Customer Service .............. 2

Table of Contents ........................................................ 2

General Information ................................................... 2

Connector and Cable Information ..............................3

Introduction .................................................................3

Performance Features .................................................3

Dimensions .................................................................5

Installation ..................................................................6

Rear Panel Connections and Switch ...........................7

Output Terminals and How to Connect .................. 8-9

Output Terminals and How to Connect

  for Bi-Amp ......................................................... 10-11

Front Panel Displays and Controls ............................12

How to Operate .........................................................13

Technical Description .......................................... 14-17

Specifications ............................................................ 18

Packing Instruction ...................................................19

1. For additional connection information, refer to the 

owner’s manual(s) for any component(s) connected 

to the MC312.

2. The MC312 mutes the speaker output for approxi-

mately two seconds when first turned on.

3. For the best performance and safety it is important 

to always match the impedance of the Loudspeaker 

to the Power Amplifier connections. Refer to “How 

to Connect” pages 7 thru 10.

Note: The impedance of a Loudspeaker actually var-

ies as the Loudspeaker reproduces different 

frequencies. As a result, the nominal impedance 

rating of the Loudspeaker (usually measured at 

a midrange frequency) might not always agree 

with the impedance of the Loudspeaker at low 

frequencies where the greatest amount of power 

is required. Contact the Loudspeaker Manufac-

turer for additional information about the actual 

impedance of the Loudspeaker before connecting 

it to the McIntosh MC312.

4

In the event the MC312 over heats, due to improper 

ventilation and/or high ambient temperature, the 

protection circuits will activate. The Front Panel 

Power Guard LED will continuously indicate ON 

and the audio will be muted. When the MC312 has 

returned to a safe operating temperature, normal 

operation will resume.

5. When discarding the unit, comply with local rules 

or regulations. Batteries should never be 

thrown away or incinerated but disposed 

of in accordance with the local regulations 

concerning battery disposal.

6. For additional information on the MC312 and 

other McIntosh Products please visit the McIntosh    

Website at www.mcintoshlabs.com.

General Information

Содержание MC312

Страница 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com MC312 Power Amplifier Owner s Manual...

Страница 2: ...rtant Additional Operation Information Guide Thank You and Please Take a Moment 2 Technical Assistance and Customer Service 2 Table of Contents 2 General Information 2 Connector and Cable Information...

Страница 3: ...n though the power line varies Illuminated Power Meters The Illuminated Power Output Watt Meters on the MC312 are peak responding and indicate the true power output of the amplifier The Peak Watt Hold...

Страница 4: ...for your MC312 Dimensions Front View of the MC312 Rear View of the MC312 Side View of the MC312 17 1 2 44 5cm 8 7 8 22 5cm 9 7 16 24 0cm 11 3 4 29 9cm 16 13 16 43 0cm DISABLED 20 50 8cm 3 16 0 5cm 16...

Страница 5: ...ble oper ating temperature A custom cabinet installation should provide the fol lowing minimum spacing dimensions for cool opera tion Allow at least 6 inches 15 24cm above the top 2 inches 5 08cm belo...

Страница 6: ...n tosh Component Unbalanced INput RIGHT Channel for an audio cable from a Preamplifier or A V Con trol Center audio output Unbalanced OUTput RIGHT Channel for an audio cable to the next Power Amplifie...

Страница 7: ...McIntosh MC312 Power Amplifier is designed for Loudspeakers with an impedance of 2 ohms 4 ohms or 8 ohms Connect a single Loudspeaker only to the Right and Left Output Terminals When connecting Loudsp...

Страница 8: ...Loudspeaker s impedance is in between the available connections use the nearest lower impedance connection Refer to General Informa tion Note 3 on page 2 for additional information WARNING Loudspeake...

Страница 9: ...ptional hookup is to use unbalanced cables and place the INPUT MODE Switch in the UNBALANCED Position 4 Connect XLR cables from the MC312 Power Amplifier 1 Audio Balanced OUTput LEFT and RIGHT to the...

Страница 10: ...uarter of a turn 90 Do not over tighten Refer to figure E on page 9 8 Referring to figure H connect the Loudspeaker hookup cables with ba nana plugs into the hole at the top of the terminal to the MC3...

Страница 11: ...11...

Страница 12: ...the display modes of the Power Output Meter and Meter Illumination Meter indicates the Right Channel Output of the amplifier LED indicates when the LEFT Channel Amplifier POWER GUARD circuit activate...

Страница 13: ...MC312 and the Audio Preamplifier or A V Con trol Center in order for the remote power turn on to function Meter Selection Rotate the meter mode switch to select the meter operation mode you desire Re...

Страница 14: ...can deliver the best possible performance from any type of high quality loudspeaker system Refer to figure 14 Creating an amplifier with this level of perfor mance did not come easily Many months of...

Страница 15: ...at is lower than optimum causes more output current to flow which results in extra heat being generated in the power output stage This increase in temperature will result in a reduced life expectancy...

Страница 16: ...se in sonic perfor mance with this circuit and it ensures safe operation of the amplifier under even the most extreme operat ing conditions The different types of protection circuits incorporated in t...

Страница 17: ...ntrol Out Jacks The Power Control signal from these jacks is delayed by a fraction of a second so that the turn on power surge of the next power amplifier occurs at a later time This helps prevent pow...

Страница 18: ...tor Greater than 40 Input Impedance 22 000 ohms Balanced 22 000 ohms Unbalanced Voltage Gain 29dB 8 Ohms 26dB 4 Ohms 23dB 2 Ohms Power Guard Less than 2 Total Harmonic Distortion with up to a 14dB ove...

Страница 19: ...shipping damage Use the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please call or writ...

Страница 20: ...cts is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed in the U S A McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 www mcin...

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