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Your decision to own this McIntosh MC611 Quad 

Balanced 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 pos-

sible with all the features and functions of your new 

McIntosh.

Copyright 2017 © 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 MC611.

2. The MC611 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 MC611.

4

In the event the MC611 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 MC611 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 MC611 and 

other McIntosh Products please visit the McIntosh    

Website at www.mcintoshlabs.com.

General Information

Summary of Contents for MC611

Page 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com MC611 Quad Balanced Power Amplifier Owner s Manual...

Page 2: ...mportant 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 Informati...

Page 3: ...n 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...

Page 4: ...cation for your MC611 Dimensions Front View of the MC611 Rear View of the MC611 Side View of the MC611 17 1 2 44 45cm 8 7 8 22 54cm 9 7 16 23 97cm 11 3 4 29 85cm 16 13 16 42 70cm 20 3 16 51 27cm 3 16...

Page 5: ...per 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 below the...

Page 6: ...ced or BALanced Input BALanced INput for audio cables from a Preamplifier or A V Processor audio output BALanced OUTput for an audio cable to the next Power Amplifier Input OUTPUT Connections for a 2...

Page 7: ...tion 2 When multiple MC611s are used in a Ste reo or Multichannel System match up the Preamplifier or A V Processor Channel Output designation to each MC611 with Loudspeaker and the Loudspeaker loca t...

Page 8: ...of the cable end into the terminal side access hole and tighten the terminal cap until the cable is firmly clamped into the terminals so the lugs or wire cannot slip out Refer to figures 7 and 8 Note...

Page 9: ...from the MC611 Rear Panel and temporarily place them in a safe place Refer to figure 1 This McIntosh MC611 Quad Balanced Power Ampli fier is designed for Loudspeakers with an impedance of 2 ohms 4 ohm...

Page 10: ...he right side Refer to figure 6 14 Connect the Loudspeaker hookup cables to the MC611 Negative Output Terminal and Positive Output Terminal indentified as 2 ohms 4 ohms or 8 ohms connection to match t...

Page 11: ...11...

Page 12: ...ndicator POWER Switch Turns AC Power Off Remote AC Power On METER Switch selects the display modes of the Power Output Meter and Meter Illumination Meter indicates the Output of the amplifier LED indi...

Page 13: ...this power level until a higher power peak passes through the amplifier The meter point er will then rise to the newer higher indication If no further power peaks are reached the meter pointer will v...

Page 14: ...cIntosh MC611 Output Autoformer It provides low distortion power transfer at frequencies from below 20Hz to well beyond 20 000Hz with optimum impedance points of two ohms four ohms and eight ohms The...

Page 15: ...th an Autoformer Its frequency re sponse exceeds that of the output circuit itself and extends well beyond the audible range Its distortion level is so low it is virtually impos sible to measure exper...

Page 16: ...he possibility of ever overdriving the ampli fier into clipping Refer to figures 20 21 and 22 An overdriven amplifier can produce both audible and inaudible distortion levels exceeding 40 The audible...

Page 17: ...fuses a very important feature in a high power Home Systems employing multiple MC611 Power Amplifiers which is necessary for the wide dynamic range that Digital Audio demands Refer to figure 25 Power...

Page 18: ...pedance 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 overdrive signal Power Control...

Page 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...

Page 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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