McIntosh | MC611 | Owner's Manual | Mcintosh MC611 1-Channel Solid State Amplifier Owner's Manual

Mcintosh MC611 1-Channel Solid State Amplifier Owner's Manual
McIntosh Laboratory, Inc.
2 Chambers Street Binghamton, New York
MC611
Quad Balanced
Power Amplifier
Owner’s Manual
13903-2699 Phone: 607-723-3512
www.mcintoshlabs.com
Important Safety Information is supplied in a separate document “Important Additional Operation Information Guide”
Thank You
Customer Service
General Information
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 possible with all the features and functions of your new
McIntosh.
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:
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 approximately 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.
Please Take A Moment
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:_________________________________
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
2
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3515
Fax: 607-723-1917
Table of Contents
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
Note: The impedance of a Loudspeaker actually varies 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 Manufacturer 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.
Copyright 2017 © by McIntosh Laboratory, Inc.
Cable Information, Introduction and Performance Features
Connector and Cable Information
XLR Connectors
Below is the Pin configuration for the XLR Balanced
Input, Input/Output Connectors on the MC611. Refer
IN
OUT
to the diagram for connection:
PIN 1: Shield/Ground
PIN 2: + Input/Output
PIN 1
PIN 2
PIN 2
PIN 1
PIN 3: - Input/Output
PIN 3
PIN 3
Power Control Connector
The MC611 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 curTrigger
rent up to 50mA. An additional Control
Meter
connection is for controlling
Illumination
the illumination of the MC611
Control Ground
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).
3/10 of an inch
(7.6millimeters)
Introduction
Now you can take advantage of traditional McIntosh
standards of excellence in the MC611 Quad Balanced
Power Amplifier. The 600 watts high current output
will drive any high quality Loudspeaker. The MC611
reproduction is sonically transparent and absolutely
accurate. The McIntosh Sound is “The Sound of the
Music Itself”.
Performance Features
• Power Output
The MC611 is a Power Amplifier with a capability of
600 watts into 2, 4 or 8 ohm speakers with less than
0.005% distortion. The Power Amplifier Circuitry
uses Thermal Trak1 Output Transistors for lower distortion and cool operation.
• Quad Balanced Circuitry
The MC611 is fully balanced from input to output. It
consists of two matched power amplifiers operating
in push-pull with their outputs combined in a McIntosh Autoformer. The Quad Balanced configuration
cancels virtually all distortion.
• Patented Autoformer
McIntosh designed and manufactured Output Autoformers 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 loudspeaker.
• Sentry Monitor and Thermal Protection
McIntosh Sentry Monitor power output stage protection circuits ensure the MC611 will have a long and
1
trouble free operating life. Built-in Thermal Protection
Circuits guard against overheating.
• Special Power Supply
A very large Power Transformer and Large Capacitors ensure stable noise free operation even though the
power line varies.
• Illuminated Power Meter
The Illuminated Power Output Watt Meter on the
MC611 is peak responding, and indicates the true
power output of the amplifier. The Peak Watt Hold
Mode allows the meter to temporarily stay at the highest 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 diameter wire and spade lugs. Banana plugs may also be
used only in the United States and Canada.
• Fiber Optic Solid State Front Panel Illumination
The even Illumination of the Front Panel is accomplished by extra long life Light Emitting Diodes
(LEDs).
• Glass Front Panel and Super Mirror Chassis
Finish
The famous McIntosh Illuminated Glass Front Panel
and the Stainless Steel Chassis with Super Mirror Finish ensures the pristine beauty of the MC611 will be
retained for many years.
ThermalTrak™ and ON Semiconductor are trademarks of Semiconductor Components Industries, LLC
3
Dimensions
Dimensions
The following dimensions can assist in determining
the best location for your MC611.
Front View of the MC611
17-1/2"
44.45cm
8-7/8"
22.54cm
Side View of the MC611
9-7/16"
23.97cm
20-3/16"
51.27cm
17-15/16"
45.55cm
Rear View of the MC611
8-3/8"
3/16" 21.27cm
0.48cm
16-13/16"
42.70cm
2-1/4"
5.71cm
11-3/4"
29.85cm
4
13"
33.02cm
2-3/16"
5.55cm
Installation
Installation
The MC611 can be placed upright on a table or
shelf, standing on its four feet. It also can be custom
installed in a piece of furniture or cabinet of your
choice. The four feet may be removed from the bottom
of the MC611 when it is custom installed as outlined
below. The four feet together with the mounting
screws should be retained for possible future use if the
MC611 is removed from the custom installation and
used free standing. The required panel cutout, ventilation cutout and unit dimensions are shown.
Always provide adequate ventilation for your MC611.
Cool operation ensures the longest possible operating
life for any electronic instrument. Do not install the
MC611 directly above a heat generating component
such as a high powered amplifier. If all the components are installed in a single cabinet, a quiet running
ventilation fan can be a definite asset in maintaining
all the system components at the coolest possible operating temperature.
A custom cabinet installation should provide the following minimum spacing dimensions for cool operation.
Allow at least 6 inches (15.24cm) above the top, 2
inches (5.08cm) below the bottom, 3 inches (7.62cm)
behind the rear panel and 2 inches (5.08cm) on each
side of the Power Amplifier, so that airflow is not
obstructed. Allow 2-1/2 inches (6.35 cm) in front of
the mounting1 panel for clearance. Be sure to cut out
a ventilation hole in the mounting shelf according
to the dimensions in the drawing.
1
17"
43.18cm
Opening for Ventilation
14-11/16"
MC611 Front Panel
Custom Cabinet Cutout
37.30cm
Cutout Opening for Custom Mounting
Cabinet Front Panel
Cabinet
Front
Panel
6"
15.24cm
Opening
for Ventilation
MC611 Side View
in Custom Cabinet
Cutout Opening for Ventilation
Support
Shelf
MC611 Bottom View
in Custom Cabinet
When the MC611 is installed together with other McIntosh Components, check clearances on all components
before proceeding.
Chassis
Spacers
2-1/2"
6.35cm
12-3/4"
32.38cm
16"
Cutout Opening
for Ventilation
40.64cm
Note: Center the cutout Horizontally
on the unit. For purposes of
clarity, the above illustration
is not drawn to scale.
5
Rear Panel Connections and Switch
POWER CONTROL IN
receives turn On/Off
signals from a McIntosh
component
UNBALanced INput for an audio cable from a Preamplifier or
A/V Processor audio output
BALanced OUTput for
an audio cable to the next
Power Amplifier Input
INPUT MODE switch selects between
UNBALanced or BALanced Input
BALanced INput for audio
cables from a Preamplifier or
A/V Processor audio output
AUTO OFF Mode
Switch selects
between ENAbled
or DISabled
POWER CONTROL OUT
1 and 2 send turn On/Off
signals to the next McIntosh Component
UNBALanced OUTput
for an audio cable to the
next Power Amplifier
Input
Fuse holder, refer to information on the rear panel of
your MC611 to determine
the correct fuse size and
rating
OUTPUT Connections for
a 2 ohm Loudspeaker
Connect the MC611 power
cord to a live AC outlet. Refer
to the rear panel to determine
the correct voltage
Caution: The Loudspeaker
6
OUTPUT Connections for
an 8 ohm Loudspeaker
OUTPUT Connections for
a 4 ohm Loudspeaker
Negative Connections are above chassis ground. Do not combine any connections together, ground them or connect with another MC611.
Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MC611 Power Amplifier Output Terminals please
follow the steps below:
1. Rotate the top of the Output Terminal Post counterclockwise until an opening
appears. Refer to figures A and
B.
2. Insert the Loudspeaker hookup
cable into the Output Terminal
Opening
Post opening or the cable spade
Figure B
Figure A
lug around the center post of
the Output Terminal. Refer to
figure C.
3. Rotate the top of the Output
Terminal Post clockwise until it
is finger tight. Refer to figure D.
4. Place the supplied McIntosh
Figure C Figure D
Wrench over the top of the Output Terminal and rotate it one
quarter of a turn (90° ) to secure
the Loudspeaker Cable Connection. Do not over tighten. Refer
to figure E.
Figure E
How to Connect
1. For Remote Power Control, connect a power control
cable from the Audio Preamplifier or A/V Control
Center Power Control Output 1 to the Amplifier
POWER CONTROL IN.
2. Connect XLR cables from the Balanced Output 1
Right Channel, (refer to note 2 below) of an Audio
Preamplifier or A/V Processor to the Amplifier
BALanced INput. Place the INPUT MODE Switch
in the BALANCED Position.
Notes: 1. An optional hookup is to use an unbalanced cable and place the INPUT MODE
Switch in the UNBALanced Position.
2. When multiple MC611s are used in a Stereo or Multichannel System, match up the
Preamplifier or A/V Processor Channel
Output designation to each MC611 with
Loudspeaker and the Loudspeaker location in the room.
3. Using a suitable tool remove the two screws from
the MC611 Rear Panel and temporarily place them
in a safe place. Refer to figure 1.
Remove Screws
Caution: Do not connect the AC Power Cord to the
MC611 Rear Panel until after the Loudspeaker
Connections are made and the protective Terminal Connections Cover is installed. Failure to
observe this could result in Electric Shock.
The connection instructions below, together with the
MC611 Connection Diagram located on the separate
folded sheet “Mc1A”, is an example of a typical audio
system. Your system may vary from this, however the
actual components would be connected in a similar
manner. For additional information refer to “Connector and Cable Information” on page 3.
Figure 1
This McIntosh MC611 Quad Balanced Power Amplifier is designed for Loudspeakers with an impedance
of 2 ohms, 4 ohms or 8 ohms. Connect a single Loudspeaker only to the Output Terminals.
When connecting Loudspeakers to the MC611 it
is very important to use cables of adequate size, so
there is little to no power loss in the cables. The size is
specified in Gauge Numbers or AWG (American Wire
Gauge). The smaller the Gauge number, the larger the
wire size:
Loudspeaker Cable Distance vs Wire Gauge Guide
Loudspeaker
Impedance
25 feet
(7.62 meters)
or less
50 feet
(15.24 meters)
or less
100 feet
(30.48 meters)
or less
2 Ohms
8AWG
12AWG
10AWG
4 Ohms
14AWG
12AWG
10AWG
8 Ohms
16AWG
14AWG
12AWG
4. Prepare the Loudspeaker Hookup Cable for attachment to the MC611 Power Amplifier:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures 2, 3 & 4. If the cable
is stranded, carefully twist the strands together
as tightly as possible.
Figure 2
Figure 3
Figure 4
Notes: 1. If desired, the twisted ends can be tinned
with solder to keep the strands together.
2. The prepared bare wire cable ends may be
inserted into spade lug connectors.
3. Banana plugs are for use in the United
States and Canada only.
Banana Plugs are for use in the United States and
Canada only:
5. Locate the Terminal Connections Cover from the
inside of the MC611 shipping carton. Insert the
just prepared Loudspeaker hookup cables thru the
7
Output Terminals and How to Connect
cover opening on the left side. Refer to figure 5.
Cover
Cover Opening
Cover Screws
Figure 5 (Inside USA and Canada)
6. Attach the previously prepared bare wire cable ends
into the banana plugs and secure the
connections. Refer to figure F.
7. Rotate the top of the Output Terminal
Post clockwise until it is finger tight.
Figure F
Refer to figure G. Then using the McIntosh Wrench, rotate the top of the
Output Terminal one quarter of a turn
(90° ). Do not over tighten. Refer to
figure E.
8. Referring to figure H, connect the
Figure G
Loudspeaker hookup
cables with banana plugs
into the hole at the top of
the MC611 Negative and
Figure H
Figure F
Positive Output Terminals.
The terminals are indentified as 2Ω (ohms), 4Ω (ohms) or 8Ω (ohms) connection to match the impedance of the Loudspeaker,
being careful to observe the correct polarities.
Note: The illustration in figure 5 is connections for
8Ω (ohms) Loudspeakers.
If the Loudspeaker’s impedance is in-between the
available connections, use the nearest lower imped8
ance connection. Refer to “General Information” Note
3 on page 2 for additional information.
Cover Openings
Cover
WARNING: Loudspeaker terminals are hazardous
live and present a risk of electric shock.
For additional instruction on making
Loudspeaker Connections contact your
McIntosh Dealer or McIntosh Technical Support.
9. Attach the Terminal Connections Cover to the
MC611 Rear Panel with the previously removed
Screws. Refer to figure 5.
10. Connect the MC611 power cord to an active AC
outlet.
Spade Lug or Wire Connections:
11. Locate the Terminal Connections Cover from the
inside ofFigure
the MC611
shipping carton. Insert the
H
just prepared Loudspeaker hookup cables thru the
cover opening on the right side. Refer to figure 6.
12. Connect the Loudspeaker hookup cables to the
MC611 Negative Output Terminal and Positive
Output Terminal indentified as 2Ω (ohms), 4Ω
(ohms) or 8Ω (ohms) connection to match the
impedance of the Loudspeaker, being careful to
observe the correct polarities. Insert the spade
lug connector or prepared section 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: The illustration in figure 6 is connections for
8Ω (ohms) Loudspeakers.
If the Loudspeaker’s impedance is in-between
the available connections, use the nearest lower
impedance connection. Refer to “General Information” Note 3 on page 2 for additional information.
Cover Screws
Figure 6 (Outside USA and Canada)
Figure 7
Figure 8
WARNING: Loudspeaker terminals are hazardous live and present a risk of electric
shock. For additional instruction on
making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support.
13. Attach the Terminal Connections Cover to the
MC611 Rear Panel with the previously removed
Screws. Refer to figure 6.
14. Connect the MC611 power cord to an active AC
outlet.
Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MC611 Power Amplifier Output Terminals please
follow the steps below:
1. Rotate the top of the Output Terminal Post counterclockwise until an opening
appears. Refer to figures A and
B.
2. Insert the Loudspeaker hookup
cable into the Output Terminal
Opening
Post opening or the cable spade
Figure B
Figure A
lug around the center post of
the Output Terminal. Refer to
figure C.
3. Rotate the top of the Output
Terminal Post clockwise until it
is finger tight. Refer to figure D.
4. Place the supplied McIntosh
Figure C Figure D
Wrench over the top of the Output Terminal and rotate it one
quarter of a turn (90° ) to secure
the Loudspeaker Cable Connection. Do not over tighten. Refer
to figure E.
Figure E
How to Connect for Bi-Amp
Caution: Do not connect the AC Power Cord to the
MC611 Rear Panel until after the Loudspeaker
Connections are made and the protective Terminal Connections Cover is installed. Failure to
observe this could result in Electric Shock.
The connection instructions below, together with the
MC611 Connection Diagram located on the separate
folded sheet “Mc1B”, is an example of a typical audio
system. Your system may vary from this, however the
actual components would be connected in a similar
manner. For additional information refer to “Connector and Cable Information” on page 3.
1. For Remote Power Control, connect a power control
cable from the Audio Preamplifier or A/V Processor Power Control Trig 1 Output to Amplifier One
POWER CONTROL IN.
2. Connect a power control cable from Amplifier One
Power Control OUTput 1 to Amplifier Two POWER CONTROL IN.
3. Connect XLR cables from the Balanced Output 1
Right Channel (refer to note 2 below) of an Audio
Preamplifier or A/V Processor to Amplifier BALanced INput. Place the INPUT MODE Switch in
the BALanced Position.
Notes: 1. An optional hookup is to use an unbalanced
cable and place the INPUT MODE Switch in
the UNBALanced Position.
2. When multiple MC611s are used in a Stereo
or Multichannel System, match up the
Preamplifier or A/V Processor Channel
Output designation to each MC611 with
Loudspeaker and the Loudspeaker location
in the room.
4. Connect XLR cables from Amplifier One Audio
BALanced OUTput to Amplifier Two BALanced
INput.
5. Using a suitable tool remove the two screws from
the MC611 Rear Panel and temporarily place them
in a safe place. Refer to figure 1.
This McIntosh MC611 Quad Balanced Power Amplifier is designed for Loudspeakers with an impedance
of 2 ohms, 4 ohms or 8 ohms. Connect a single Loudspeaker only to the Output Terminals.
When connecting Loudspeakers to the MC611 it
is very important to use cables of adequate size, so
there is little to no power loss in the cables. The size is
specified in Gauge Numbers or AWG (American Wire
Gauge). The smaller the Gauge number, the larger the
wire size:
Remove Screws
Figure 1
Loudspeaker Cable Distance vs Wire Gauge Guide
Loudspeaker
Impedance
25 feet
(7.62 meters)
or less
50 feet
(15.24 meters)
or less
100 feet
(30.48 meters)
or less
2 Ohms
12AWG
10AWG
8AWG
4 Ohms
14AWG
12AWG
10AWG
8 Ohms
16AWG
14AWG
12AWG
6. Prepare the Loudspeaker Hookup Cable for attachment to the MC611 Power Amplifier:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures 2, 3 & 4. If the cable
is stranded, carefully twist the
strands together
Figure 3
Figure 4
as tightly as pos- Figure 2
sible.
Notes: 1. If desired, the twisted ends can be tinned
with solder to keep the strands together.
2. The prepared bare wire cable ends may be
inserted into spade lug connectors.
3. Banana plugs are for use in the United
States and Canada only.
9
How to Connect for Bi-Amp
Banana Plugs are for use in the United States and
Canada only:
7. Locate the Terminal Connections Cover from the
inside of the MC611 shipping carton. Insert the
just prepared Loudspeaker hookup cables thru the
cover opening on the right side. Refer to figure 5.
Cover
Cover Opening
Cover Screws
Figure 5 (Inside USA and Canada)
8. Attach the previously prepared bare wire cable
ends into the banana plugs and secure
the connections. Refer to figure F.
9. Rotate the top of the Output Terminal
Post clockwise until it is finger tight.
Figure F
Refer to figure G. Then using the McIntosh Wrench, rotate the top of the
Output Terminal one quarter of a turn
(90° ). Do not over tighten. Refer to
figure E.
10. Referring to figure H, connect the
Figure G
Loudspeaker hookup cables with banana plugs into the hole
at the top of the MC611
Negative and Positive
Figure H
Output Terminals.Figure
TheF
terminals are indentified
as 2Ω (ohms), 4Ω (ohms) or 8Ω (ohms) connection
to match the impedance of the Loudspeaker, being
10
careful to observe the correct polarities.
Cover Openings
Cover
Note: The illustration in figure 5 is connections for
8Ω (ohms) Loudspeakers.
If the Loudspeaker’s impedance is in-between the
available connections, use the nearest lower impedance connection. Refer to “General Information” Note
3 on page 2 for additional information.
WARNING: Loudspeaker terminals are hazardous
live and present a risk of electric shock.
For additional instruction on making
Loudspeaker Connections contact your
McIntosh Dealer or McIntosh Technical Support.
11. Attach the Terminal Connections Cover to the
MC611 Rear Panel with the previously removed
Screws. Refer to figure 5.
12. Connect the MC611 power cord to an active AC
outlet.
Spade Lug or Wire Connections:
13. Locate the Terminal Connections Cover from the
inside of the MC611 shipping carton. Insert the
Figure HLoudspeaker hookup cables thru the
just prepared
cover opening on the right side. Refer to figure 6.
14. Connect the Loudspeaker hookup cables to the
MC611 Negative Output Terminal and Positive
Output Terminal indentified as 2Ω (ohms), 4Ω
(ohms) or 8Ω (ohms) connection to match the
impedance of the Loudspeaker, being careful to
observe the correct polarities. Insert the spade
lug connector or prepared section 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: The illustration in figure 6 is connections for
8Ω (ohms) Loudspeakers.
Cover Screws
Figure 6 (Outside USA and Canada)
Figure 7
Figure 8
If the Loudspeaker’s impedance is in-between
the available connections, use the nearest lower
impedance connection. Refer to “General Information” Note 4 on page 2 for additional information.
WARNING: Loudspeaker terminals are hazardous live and present a risk of electric
shock. For additional instruction on
making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support.
15. Attach the Terminal Connections Cover to the
MC611 Rear Panel with the previously removed
Screws. Refer to figure 6.
16. Connect the MC611 power cord to an active AC
outlet.
11
Front Panel Displays and Controls
LED indicates when the Amplifier
POWER GUARD circuit activates
Meter indicates the Output
of the amplifier
METER Switch selects
the display modes of the
Power Output Meter and
Meter Illumination
12
Standby Power
On Indicator
POWER Switch Turns AC Power Off,
Remote, AC Power On
How to Operate
How to Operate
Power On
To have the MC611 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 MC611 and the Audio
Preamplifier or A/V Control
Center, in order for the
remote power turn-on to
function.
plifier. It indicates to an accuracy of at
least 95% of the power output with only
a single cycle of a 2000Hz tone burst.
Figure 8
Meter Selection
Rotate the meter mode switch to select the meter
operation mode you desire.
Refer to figures 9 and 10.
Lights Off - Meter
illumination
is switched
Off and the
meter will
Figure 9
continue to
indicate the power output.
Note: When Power Control Input of the
MC611 is connected to an Audio
Preamplifier or A/V Control Center with Remote Meter Illumination
Control, the Meter Illumination
will automatically be remotely controlled (On/Off) with the METER
Switch set to the WATTS or HOLD
position.
Watts- The meter responds to all the musical
information being produced by the am-
Figure 10
Hold - The meter pointer is locked to the highest power peak in a sequence of peaks.
It is electronically held to this power
level until a higher power peak passes
through the amplifier. The meter pointer will then rise to the newer higher
indication. If no further power peaks
are reached, the meter pointer will
very slowly return to its rest position
or lower power level. The decay rate is
approximately 6dB per minute.
Auto Off Switch
The MC611 incorporates Power Save Circuitry to
automatically place the MC611 into the power saving
Standby Mode approximately 30 minutes after there
has been an absence of an audio input signal.
When there is a Power Control Connection between the MC611 and a Preamplifier with Power Save
Circuitry, the AUTO OFF Switch is bypassed (located
on the Rear Panel of the MC611). Refer to
figure 12.
In the event there is no Power Control
Connection and the Power Save Circuitry
is activating inappropriately relative to
your specific use of the MC611, place
Figure 12
the AUTO OFF Switch in the DISable
position.
Note: If the Power Save Circuitry has switched Power
to the MC611 OFF, place the POWER in the OFF
Position and then in the ON position to reset the
circuitry.
Note: The MC611 Power Output Meter
indicates the actual power delivered
to the loudspeakers by responding
to the combination of current and
voltage output.
Input Mode Switch
The Input Mode Switch, which is located on the Rear Panel of the MC611,
allows selection of either the Balanced or Unbalanced Input. Refer to
figure 11.
Figure 11
13
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.
Figure 13
14
The MC611 has a continuous average power output
rating of 600 watts and with a peak output current of
90 amperes; making this one of the most advanced
amplifiers available today. The distortion limits for the
MC611 are no more than 0.005% at rated power output
for all frequencies from 20Hz to 20,000Hz. Typical
performance at mid frequencies is
less than 0.002%. The true distortion readings on the MC611 are
so low, it takes special measuring techniques to make accurate
readings. The MC611 can deliver
the best possible performance
from any type of high quality
loudspeaker system. Refer to
figure 13.
Creating an amplifier with
this level of performance did not
come easily. Many months of design, testing and measuring were
required. Extensive controlled
listening tests, the ultimate form
of measuring, were made before
the final design was accepted.
Design Philosophy
The design philosophy incorporated in the MC611 involved
several different techniques, all
based on sound scientific logic.
Every stage of voltage or current amplification must be as
linear as possible prior to the use
of negative feedback. McIntosh
engineers know how to properly
design negative feedback circuits so they contribute
to the extremely low distortion performance expected
from a McIntosh amplifier. The typical McIntosh
owner would never accept the approximately 100
times higher distortion of many non-feedback designs.
Double Balanced Push-Pull design is used from
input to output. Each half of the amplifier contains
complimentary balanced circuitry. The resulting Quad
Balanced configuration cancels even order distortion.
Refer to figure 16.
All transistors are selected to have nearly constant
current gain over the entire current range they must
cover. Output transistors in particular,
have matched uniform current gain, high
current bandwidth product and large
active region safe operating area. These
Power Transistors are the very latest in
semiconductor technology and incorporate a new design known as ThermalTrak™. Refer to figure 14. This allows for
the instantaneous and accurate monitorFigure 14
ing of the Power Transistor Temperature.
The MC611 Power Output Circuitry has a specially
designed bias circuit to take full advantage of the
ThermalTrak™ Power Transistors and thus precisely
controls the power amplifier operation over a wide
range of music conditions with the benefits of lower
distortion and cooler operation. Precision metal film
resistors and low dielectric absorption film capacitors
are used in all critical circuit locations.
The output signals of the two balanced circuits
are coupled together in the unique McIntosh 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 unequaled
Technical Description
expertise of McIntosh in the
design and manufacturing of
autoformers is legendary in
the high fidelity industry.
The high efficiency circuit
design of the MC611 contributes to low operating temperatures. More than 1400
square inches of heat sink
area keep the MC611 operating safely with convection
cooling. No fans are needed.
Refer to figure 15.
Autoformers
All solid state power amplifier output circuits work best
Figure 15
ThermalTrak
DC BIAS
UNBALANCED
INPUT
UNBALANCED
OUTPUT
THERMAL
SENSORS
+
AMP
INPUT MODE
SWITCH
POWER GUARD
ATTENUATOR
BALANCED
AMP
OUTPUT
MUTE
-
AMP
BALANCED
INPUT
BALANCED
OUTPUT
+
+
ThermalTrak
DC BIAS
-
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
Figure 17
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 for the amplifier.
The special Balanced Winding Autoformer
creates an ideal match between the power amplifier output stage and the loudspeaker. Refer
to figure 17.
There is absolutely no performance limitation with an Autoformer. Its frequency response exceeds that of the output circuit itself,
and extends well beyond the audible range. Its
distortion level is so low it is virtually impossible to measure.
Block Diagram
of the
Power Amplifier
Figure 16
15
Technical Description, con’t
In the rare event of a power amplifier output circuit
failure, the McIntosh Autoformer provides absolute
protection from possible damage to your valuable
loudspeakers. The unequaled expertise of McIntosh in
the design
and manufacturing
of Autoformers is
legendary
in the high
fidelity
industry.
McIntosh
engineers
know how
to do it
Figure 18
right.
Power Output Meter
The McIntosh MC611 has a large Output Watt
Meter that responds 95% full scale to a single cycle
tone burst at 2kHz. Refer to figure 18. Voltage and
current outputs are electronically measured, multiplied
and fed to a special circuit that accelerates the pointer
movement in the upward direction. Refer to figure
26 on the next page. When the pointer reaches its
peak it pauses only long enough for the human eye to
perceive its position, then drops. It is almost 10 times
faster than a professional VU meter.
A front panel switch is provided to change the
meter to the Watts Hold Mode of operation. This allows fast upward movement of the pointer but greatly
increases Hold Time at the peak of its travel. The
highest power output of the source material is thus
recorded.
16
Protection Circuits
The MC611 incorporates the McIntosh Sentry Monitor
Output Transistor
Protection Circuit.
Refer to Figure 19.
There is absolutely
no compromise in
Normal Operating Area
sonic performance
with this circuit,
and it ensures safe
Sentry Monitor
Output
Safety Area
Transistor
operation of the
Failure
amplifier under
Figure 19
even the most
extreme operating
conditions. The different types of protection circuits
incorporated in the MC611 insure a long and safe
operating life. This is
Input Test Signal
just one of the many
(14kHz & 15kHz)
characteristics of McIntosh Power Amplifiers
that make them world
famous.
The MC611 also
includes the unique
patented McIntosh
Power Guard circuit.
Power Guard eliminates
the possibility of ever
Figure 20
overdriving the amplifier into clipping. Refer
to figures 20, 21 and 22. An overdriven amplifier can
produce both audible and inaudible distortion 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
Without Power Guard
due to clipping.
The Power Guard
circuit is a waveform
comparator, monitoring
both the input and output
waveforms. Under normal
operating conditions,
there are no differences
between the shape of
these waveforms. If the
amplifier is overdriven,
there will be a difference
Figure 21
between the two signal
waveforms. When the
With Power Guard
difference exceeds 0.3%,
the Power Guard activates the PG light and
a dynamic electronic
attenuator at the amplifier input reduces the
input volume just enough
to prevent any further increase in distortion. The
Power Guard circuit acts
so fast that there are abFigure 22
solutely no audible side
effects and the sonic purity of the music reproduction
is perfectly preserved. The MC611 Power Amplifier with Power Guard is not limited to just the rated
power output, but will actually produce distortion free
output well above its rated power due to the McIntosh
philosophy of conservative design.
Technical Description, con’t
Block Diagram
of the
Power Supply
BACKUP
POWER SUPPLY
LIGHTING
CONTROL
POWER
CONTROL
AUTO
OFF
CONTROL
LOGIC
POWER
SWITCH
LOW VOLTAGE
SUPPLY
Figure 26
AC Power
FUSE
INRUSH
CURRENT
LIMITER
MAIN RELAYS
POWER
TRANSFORMER
MAIN
SUPPLY
Figure 23
Figure 24
Power Supply Circuits
To compliment the design of the MC611 Power Amplifier Circuitry, there is a high current high voltage
power supply. Refer to figures 23 and 26. The very
large Power Transfomer can supply over 13 amps of
current. Refer to figure 24 (golf ball is for size comparsion).
It is enclosed in the legendary McIntosh Potted Enclosures and weighs 28 lbs. The four super size main
filter capacitors can store over 300 Joules of energy
The power amplifier draws high current from the AC
power line. Therefore, it is important that they plug
directly into the wall outlet.
Also, most owners desire one power switch for the
whole audio system. The MC611 is equipped with a
circuit that provides remote Power Control from a McIntosh A/V Control Center. Refer to figure 26. When
the A/V Control Center is switched On, a (+5V) signal
operates the power relay in the MC611. The MC611
also has two remote Power Control Out Jacks. The
Power Control signal from these jacks are 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 power circuit overload that could
trip circuit breakers or blow fuses, a very important
feature in a high power Home Systems employing
multiple MC611 Power Amplifiers.
Figure 25
which is necessary for the wide dynamic range that
“Digital Audio” demands. Refer to figure 25.
17
Specifications
Specifications
Power Output
Minimum sine wave continuous average power
output is:
600 watts into 2 ohm load
600 watts into 4 ohm load
600 watts into 8 ohm load
Output Load Impedance
2, 4 or 8 ohms
Intermodulation Distortion
0.005% maximum, if the instantaneous peak power
output does not exceed twice the rated power output
for any combination of frequencies from 20Hz to
20,000Hz.
Wide Band Damping Factor
Greater than 40
Rated Power Band
20Hz to 20,000Hz
Input Impedance
22,000 ohms Balanced
22,000 ohms Unbalanced
Total Harmonic Distortion
0.005% maximum harmonic distortion at any power
level from 250 milliwatts to rated power, 20Hz to
20,000Hz
Voltage Gain
29dB, 8 Ohms
26dB, 4 Ohms
23dB, 2 Ohms
Dynamic Headroom
2.8dB
Power Guard
Less than 2% Total Harmonic Distortion with up to a
14dB overdrive signal
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3.0dB from 10Hz to 100,000Hz
Input Sensitivity (for rated output)
4.8 Volts Balanced
2.4 Volts Unbalanced
Signal To Noise Ratio (A-Weighted)
124dB below rated output, Balanced
120dB below rated output, Unbalanced
18
Power Control Input
5-15VDC, less than 1mA
Power Control Output 1 and 2
12VDC, 50mA maximum total
Output is delayed 0.2 seconds from turn On
Power Requirements
Field AC Voltage conversion of the MC611 is not
possible. The MC611 is factory configured for one of
the following AC Voltages:
100V ~ 50/60Hz at 8 Amps
110V ~ 50/60Hz at 6.6 Amps
120V ~ 50/60Hz at 6.6 Amps
127V ~ 50/60Hz at 6.6 Amps
220V ~ 50/60Hz at 3.6 Amps
230V ~ 50/60Hz at 3.3 Amps
240V ~ 50/60Hz at 3.3 Amps
Standby: less than 0.5 watt
Note: Refer to the rear panel of the MC611 for the correct voltage.
Overall Dimensions
Width is 17-1/2 inches (44.45cm)
Height is 9-7/16 inches (23.97cm) including feet
Depth is 22 inches (55.88cm) including the Front
Panel, Handles and Cables
Weight
97.5 pounds (44.32 kg) net, 130.5 pounds (59.32 kg) in
shipping carton
Shipping Carton Dimensions
Width is 29-1/2 inches (74.93cm)
Height is 17 inches (43.18cm)
Depth is 29 inches (73.66cm)
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 plastic
feet are attached to the bottom of the equipment. Four
1/4 - 20x2-1/4 inch screws and washers must be used
to fasten the unit securely to the bottom pad and wood
skid. This will ensure the proper equipment location
on the bottom 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. If
a shipping carton or any of the interior part(s) are
needed, please call or write Customer Service Department of McIntosh Laboratory. Refer to page 2. Please
see the Part List for the correct part numbers.
Quantity Part Number
1
034052
1
034051
2
034054
2
034186
2
034187
1
1
1
1
4
4
034136
034137
034188
034479
401212
104058
Description
Shipping carton top
Shipping carton bottom
Foam Pad (top and
bottom)
Foam Pad (front and rear)
Foam Pad (sides)
Inner carton top
Inner carton bottom
Foam Pad (inner carton)
Shipping skid
1/4 - 20x2-1/4 cap screw
Flat washer
19
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
www.mcintoshlabs.com
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. 04184201
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