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McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com

MC312

Power Amplifier

Owner’s Manual

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.

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

Cable Information, Introduction and Performance Features

Connector and Cable Information

Introduction

Now you can take advantage of traditional McIntosh

standards of excellence in the MC312 Power Amplifi-

er. The 300 watts power per channel with high current

output will drive any pair of high quality Loudspeak-

ers. The MC312 reproduction is sonically transparent

and absolutely accurate. The McIntosh Sound is “The

Sound of the Music Itself.”

Performance Features

• Power Output

The MC312 is a Power Amplifier with a capability

of 300 watts per channel into 2, 4 or 8 ohm speakers

with less than 0.005% distortion. The Power Amplifier

Circuitry uses ThermalTrak1 Output Transistors for

lower distortion and cool operation.

• Patented Autoformer

McIntosh designed and manufactured Output Auto-

formers provide an ideal match between the amplifier

output stages and speaker loads of 2, 4 and 8 ohms.

The Autoformers also provide perfect DC protection

for your valuable loudspeakers.

• Balanced and Unbalanced Inputs

Balanced connections guard against induced noise and

allow long cable runs without compromising sound

quality.

• Power Guard

The patented McIntosh Power Guard circuit prevents

the amplifier from being over driven into clipping,

with its harsh distorted sound that can also damage

your valuable loudspeakers.

• Sentry Monitor and Thermal Protection

McIntosh Sentry Monitor power output stage protec-

tion circuits ensure the MC312 will have a long and

trouble free operating life. Built-in Thermal Protection

Circuits guard against overheating.

• Special Power Supply

A very large Power Transformer and Large Capaci-

tors ensure stable noise free operation even 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

Mode allows the meter to temporarily stay at the high-

est power output and then slowly decay. The Front

Panel Meter Illumination may be switched Off at any

time.

• McIntosh Custom Binding Posts

McIntosh patent pending gold plated output terminals

deliver high current output. They accept large diam-

eter wire and spade lugs. Banana plugs may also be

used only in the United States and Canada.

• Glass Front Panel and Super Mirror Chassis

Finish

The famous McIntosh Illuminated Glass Front Panel

uses long life Light Emitting Diodes (LEDs) and

the Stainless Steel Chassis with Super Mirror Fin-

ish ensures the pristine beauty of the MC312 will be

retained for many years.

1 ThermalTrak™ and ON Semiconductor are trademarks of Semi-

conductor Components Industries, LLC

XLR Connectors

Below is the Pin configuration for the XLR Balanced

Input, Input/Output Connectors on the MC312. Refer

to the diagram for connection:

PIN 1: Shield/Ground

PIN 2: + Input/Output

PIN 3: - Input/Output

Power Control Connector

The MC312 Power Control Input receives an On/Off

signal from +5 to +12 volts. The Power Control Output

will in turn provide a +12 volt

Output Signal with a total cur-

rent up to 50mA. An additional

connection is for controlling

the illumination of the MC312

Power Output Meters. The 1/8

inch stereo mini phone plug connects to a McIntosh

Preamplifier or A/V Control Center Power Control

Output.

Output Terminal Connector

When cables with spade lugs are used

for Loudspeaker Connection, the spade

lugs need an opening of at least 3/10 inch

(7.6mm).

Trigger

Control

Ground

Meter

Illumination

Control

PIN 1 PIN 2

PIN 3

PIN 2 PIN 1

PIN 3

OUTIN

3/10 of an inch

(7.6millimeters)

Produktspecifikationer

Varumärke:	McIntosh
Kategori:	mottagare
Modell:	MC312
Färg på produkten:	Black, Stainless steel
Snäll:	Staafmixer
Husmaterial:	Roestvrijstaal
Tillgångar:	600 W
Innehåll behållare/burk:	1 l
Sladdförvaring:	Ja
Turboknapp:	Ja
Garde:	Ja
Mätglaset:	Ja
AC-ingångsspänning:	220 - 240 V
AC-ingångsfrekvens:	50 - 60 Hz