McIntosh MA7000 User Manual

Integrated Amplifier

MA7000

Owner’s Manual

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: [phone] FAX: [phone]

The lightning flash with arrowhead,
within an equilateral triangle, is
intended to alert the user to the
presence of uninsulated “danger­ous voltage” within the product’s
enclosure that may be of sufficient
magnitude to constitute a risk of
electric shock to persons.

The exclamation point within an
equilateral triangle is intended to
alert the user to the presence of im­portant operating and maintenance
(servicing) instructions in the litera­ture accompanying the appliance.

WARNING - TO REDUCE RISK OF

FIRE OR ELECTRICAL SHOCK, DO

NOT EXPOSE THIS EQUIPMENT TO

RAIN OR MOISTURE.

IMPORTANT SAFETY

INSTRUCTIONS!

PLEASE READ THEM BEFORE
OPERATING THIS EQUIPMENT.

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radia­tors, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two
blades with one wider than the other. A ground­ing type plug has two blades and a third ground­ing prong. The wide blade or the third prong are
provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience re­ceptacles, and the point where they exit from the
apparatus.

NO USER-SERVICEABLE PARTS

INSIDE. REFER SERVICING TO

QUALIFIED PERSONNEL.

To prevent the risk of electric shock, do not remove cover or

back. No user-serviceable parts inside.

11. Only use attachments/accessories specified by the
manufacturer.

12. Use only with the cart, stand, tripod, bracket, or
table specified by the manufacturer,
or sold with the apparatus. When a
cart is used, use caution when mov­ing the cart/apparatus combination
to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or
when unused for long periods of time.

14. Refer all servicing to qualified service person­nel. Servicing is required when the apparatus has
been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the appara­tus has been exposed to rain or moisture, does not
operate normally, or has been dropped.

15. Do not expose this equipment to dripping or
splashing and ensure that no objects filled with liq­uids, such as vases, are placed on the equipment.

16. To completely disconnect this equipment from the
a.c. mains, disconnect the power supply cord plug
from the a.c. receptacle.

17. The mains plug of the power supply cord shall
remain readily operable.

18. Do not expose batteries to excessive heat such as
sunshine, fire or the like.

2

Thank You

Table of Contents

Your decision to own this McIntosh MA7000 Integrated
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.

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: [phone]
Fax: [phone]

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: [phone]
Fax: [phone]

Safety Instructions ............................................................

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

Technical Assistance and Customer Service ....................3

Table of Contents .............................................................. 3

General Information .........................................................3

Connector and Cable Information ....................................4

Introduction .......................................................................

Performance Features .......................................................4

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

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

Connections:

Rear Panel Connections ....................................................

Connecting Components ...................................................

Connection Diagrams (Separate Sheet) .............. Mc1A/1B

Connecting Loudspeakers ................................................ 9

Remote Control:

Remote Control Push-buttons ......................................... 10

How to Operate by Remote Control ............................... 11

Front Panel Features:

Front Panel Displays, Controls, Push-buttons and Jack . 12

Operation:

How to Operate the MA7000 ..................................... 13-14

Additional Information:

Technical Description ................................................ 15-17

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

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

General Information

1. For additional connection information, refer to the
owner’s manual(s) for any component(s) connected to
the MA7000 Integrated Amplifier.

2. The Main AC Power going to the MA7000 and any
other McIntosh Component(s) should not be applied
until all the system components are connected together.
Failure to do so could result in malfunctioning of some
or all of the system’s normal operations. When the
MA7000 and other McIntosh Components are in their
Standby Power Off Mode, the Microprocessor’s Circuit­ry inside each component is active and communication
is occurring between them.

2
3

4

7
8

Copyright 2007 © by McIntosh Laboratory, Inc.

3

Connector Information, Introduction and Performance Features

Power
Control

Ground

N/C

Data
Signal

N/C

Data
Ground

PIN 2 PIN 1

PIN 3

PIN 2

PIN 1

PIN 3

Connector and Cable Information

XLR Connectors

Below is the Pin configuration for the XLR Balanced Input
and Output Connectors on the MA7000. Refer to the dia­gram for connection:
PIN 1: Shield/Ground
PIN 2: + Output
PIN 3: - Output

Power Control Connector

The MA7000 Power Control Output Jack sends Power On/
Off Signals when connected to other
McIntosh Components. A 1/8 inch
stereo mini phone plug is used for con
nection to the Power Control Output
on the MA7000.

Note: The Data and Power Control Connecting Cable is avail-

able from the McIntosh Parts Department:

Data and Power Control Cable Part No. 170-202

Six foot, shielded 2 conductor, with 1/8 inch stereo mini
phone plugs on each end.

Data Port Connectors

The MA7000 Data Out Ports send Remote Control Signals
to McIntosh Source Components. A 1/8
inch stereo mini phone plug is used for
connection.

McIntosh Plug-In Jumper Connector

The MA7000 utilizes a phono style Plug-In Jumper to con
nect the OUTPUT 1 (Preamplifier Output)
Jack to the PWR AMP (Power Amplifier
Input) Jack for each channel.

Note: The Jumper Connector is available

from the McIntosh Parts Department:

McIntosh Jumper Connector Part No. 117-781

-

-

Performance Features

• Power Output with Patented Autoformer

The MA7000 consists of a 250 watts per channel stereo
Power Amplifier with less than 0.005% distortion. The
McIntosh designed and manufactured Autoformer allows
connection of 2, 4 or 8 ohm Loudspeakers.

• Electronic Switching and Balanced Connections

The Preamplifier uses Logic Circuits controlling Electro
magnetic Switches on all inputs and operating functions
for reliable, noiseless, distortion free switching. There are
two Balanced Inputs for connection of source components
and a Balanced Preamplifier Output for driving an external
Power Amplifier.

• Power Guard

The patented McIntosh Power Guard circuit prevents the
amplifier from being overdriven 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 protection
circuits ensure the MA7000 will have a long and trouble
free operating life. Built-in thermal protection circuits
guard against overheating.

• Illuminated Power Meters

The Illuminated Power Output Watt Meters on the
MA7000 are peak responding, and indicate the power out
put of the amplifier.

• Power Control and Remote Control

The Power Control Output connection provides convenient
Turn-On/Off of McIntosh Source Components. The Data
Ports together with the supplied Remote Control provides
control of McIntosh Source Components connected to the
MA7000.

-

-

Introduction

Now you can take advantage of traditional McIntosh stan
dards of excellence in the MA7000 Integrated Amplifier.
The Power Amplifier section of the MA7000, with a power
output of 250 watts per channel, will drive a pair of quality
Loudspeakers to a high level of performance. The flex­ible Preamplifier section provides connections for various
input sources and may also be used to drive an external
Power Amplifier. The MA7000 reproduction is sonically
transparent and absolutely accurate. The McIntosh Sound
is “The Sound of the Music Itself.”

4

• Special Power Supply

The large Power Transformer, multiple filter capacitors and
regulated Power Supply ensures stable noise free operation

­even though the power line varies.

• Fiber Optic Solid State Front Panel Illumination

The even Illumination of the Front Panel is accomplished
by the combination of custom designed Fiber Optic Light
Diffusers and extra long life Light Emitting Diodes
(LEDs). The glass Front Panel ensures the pristine beauty
of the MA7000 will be retained for many years.

Dimensions

17-1/2"

44.45cm

8-13/16"

22.38cm

Front View of the MA7000

Rear View of the MA7000

9-

7/16"

23.97cm

11-1/2"

29.21cm

16-13/16"

42.70cm

Side View of the MA7000

19-3/4"

50.17cm

3/16"

0.48cm

7/8"

2.22cm

8-1/4"

20.96cm

12-3/4"

32.39cm

16-7/16"

41.75cm

1-1/4"

3.18cm

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

2-1/4"

5.72cm

The following dimensions can assist in determining the
best location for your MA7000. There is additional in­formation on the next page pertaining to installing the
MA7000 into cabinets.

Dimensions

5

Installation





8-5/16"

21.11cm

17-1/16"

43.34cm

MA7000 Front Panel
Custom Cabinet Cutout

Cutout

Opening

for

Ventilation

Cutout Opening for Ventilation

Support
Shelf

Cabinet
Front
Panel

Chassis
Spacers

MA7000 Side View
in Custom Cabinet

MA7000 Bottom View
in Custom Cabinet

9-1/2"

24.13cm

16"

40.64cm

11-1/2"

29.21cm

10"

25.4cm

4-5/8"

11.75cm

Cutout Opening
for
Custom Mounting

6"

15.24cm

Opening
for Ventilation

Note: Center the cutout Horizontally on the unit.
For purposes of clarity, the above
illustration is not drawn to scale.

The MA7000 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 MA7000 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 MA7000 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 MA7000.
Cool opera­tion ensures the
longest possible
operating life for
any electronic
instrument. Do
not install the
MA7000 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.

6

Allow at least 6 inches (15.24cm) above the top, 2 inches
(5.08cm) below the bottom and 1 inch (2.54cm) on each
side of the Integrated Amplifier, so that airf low is not ob­structed. Allow 20 inches (50.8cm) depth behind the front
panel. Allow 2-1/4 inch (5.72cm) in front of the mounting
panel for handle clearance. Be sure to cut out a ventilation
hole in the mounting shelf according to the dimensions in
the drawing.

Installation

Rear Panel Connections

Connect the MA7000
power cord to a live
AC outlet. Refer to
information on the
back panel of your
MA7000 to determine
the correct voltage for
your unit

POWER CON­TROL MAIN Out­put sends a turn-on
signal to a McIn­tosh Component
when the MA7000
is turned On

EXT SENSOR con­nector permits the
connection of a Mc­Intosh IR Sensor for
remote operation

RIGHT OUTPUT
connections for a
2, 4 or 8 ohm
loudspeaker

GND
terminal
accepts
a ground
wire from a
turntable

CD1 and DVD Bal­anced and Unbalanced
INPUTS accept high
level program source
signals

JUMPER PLUGS
connect the Pream­plifier OUTPUT 1
Jacks to the PWR
AMP IN Jacks
and are needed for
normal operation

OUTPUT 2 sends balanced
signals to a separate exter­nal Power Amplifier with
balanced inputs

LEFT OUTPUT
connections for a
2, 4 or 8 ohm
loudspeaker

Main Fuse holder,
refer to information
on the back panel
of your MA7000 to
determine the cor
rect fuse size and
rating

POWER CONTROL ACC
Output sends a turn-On,
turn-Off signal to a McIn­tosh Component when using
the MA7000 Remote Control
ACC On/Off Push-buttons

POWER CONTROL
1 and 2 Output sends
a turn-on signal to a
McIntosh Component
when the Outputs 1

-

and 2 Push-buttons
are used

PHONO accepts
signals from a
Moving Magnet
phono cartridge

DATA PORTS send
signals to McIntosh
Source Components
to allow control with
the MA7000 Remote
Control

PWR AMP
input accepts
signals from
the internal
Preamplifier
or a separate
external Pre
amplifier

CD2, SERVER,
REC and TUNER
INPUTS accept high
level program source
signals

RECord
OUTPUT
sends signals
to the input
of a recording
device

-

OUTPUT 1 sends
signals to the internal
Power Amplifier or
a separate external
Power Amplifier

7

Connecting Components

The MA7000 has the ability to automatically switch power
On/Off to McIntosh Source Components via the Power
Control connections. The Data Port Connections allow for
the remote operation of basic functions using the MA7000
Remote Control. With an external sensor connected to the
MA7000, remote control operation of the system is possi­ble from another room and/or when the MA7000 is located
in a cabinet with the doors closed.

The connection instructions below, together with the
MA7000 Input and Output Connection Diagrams located
on the separate folded sheet “Mc1A/1B”, are 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 4.

Power Control Connections:

1. Connect a Control Cable from the MA7000 POWER
CONTROL MAIN Jack to the Power Control In on the
McIntosh SACD/CD Player.

2. Connect a Control Cable from the McIntosh SACD/CD
Player Power Control Out Jack to the McIntosh Audio/
Video Player Power Control In Jack.

3. Connect a Control Cable from the McIntosh Audio/
Video Player Power Control Out Jack to the McIntosh
Tuner Power Control In Jack.

4. Connect a Control Cable from the McIntosh Tuner
Power Control Out Jack to the McIntosh Music Server
Power Control In Jack.

5. Optionally connect a Control Cable from the MA7000
POWER CONTROL OUTPUT 2 Jack to the McIntosh
Power Amplifier (Secondary Room) Power Control In
Jack.

6. Connect any additional McIntosh Components in a
similar manner, as outlined in steps 1 thru 4.

Data Control Connections:

7. Connect a Control Cable from the MA7000 TUNER
DATA PORTS Jack to the McIntosh TUNER1 Data In
Jack.

8. Connect a Control Cable from the MA7000 CD DATA
PORT Jack to the McIntosh SACD/CD Player Data In
Jack.

9. Connect a Control Cable from the MA7000 SERVER

DATA PORT Jack to the McIntosh Music Server Data
In Jack.

10. Connect a Control Cable from the MA7000 DVD
DATA PORT Jack to the McIntosh Audio/Video Player
Data In Jack.

11. Connect any additional McIntosh Components in a

similar manner, as outlined in steps 7 thru 10.

Sensor Connections:

12. Connect a RG59U or RG6U Cable from the MA7000
EXT SENSOR “F” Connector to the McIntosh Sensor
“F” Connector.

Audio Connections:

13. Connect an Audio Cable from the MA7000 TUNER
INPUT Jacks to the McIntosh TUNER 1 Fixed Output
Jacks.

14. Connect Balanced Cables from the MA7000 CD
INPUT Jacks to the McIntosh SACD/CD Player Fixed
Balanced Output Jacks.

Note: Unbalanced Audio Cables may be used instead of

the Balanced Cables, but not both.

15. Connect an Audio Cable from the MA7000 SERVER
INPUT Jacks to the McIntosh Music Server Output
Jacks.

16. Connect an Audio Cable from the MA7000 REC OUT­PUT Jacks to the McIntosh Music Server Input 1 Jacks.

17. Connect Balanced Cables from the MA7000 DVD
INPUT Jacks to the McIntosh Audio/Video Player Bal­anced Output Jacks.

Note: Unbalanced Audio Cables may be used instead of

the Balanced Cables, but not both.

18. Connect the Audio Cables coming from the Turntable
to the MA7000 PHONO INPUT Jacks.

19. Optionally, connect Balanced Cables from the MA7000
OUTPUT 2 Jacks to the McIntosh Power Amplifier
(Secondary) Input Jacks.

20. Connect any additional McIntosh Components in a
similar manner, as outlined in steps 14 thru 18.

Ground Connections:

21. Connect the Ground Cable coming from the Turntable
to the MA7000 GND Binding Post.

AC Power Cords Connections:

22. Connect the MA7000 and any remaining components’
AC Power Cords to a live AC outlet as illustrated.

8

Connecting Loudspeakers

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Caution: The supplied AC Power Cord should not be

connected to the Rear Panel of the MA7000
Amplifier until after the Loudspeaker Connec­tions have been made. Failure to observe this
could result in Electric Shock. For additional
instruction on making Loudspeaker Connec­tions contact your McIntosh Dealer or McIn­tosh Technical Support.

When connecting Loudspeakers to the MA7000 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:

If your loudspeaker cables are 50 feet (38.1m) or less,
use at least 14 Gauge.
If your loudspeaker cables are 100 feet (76.2m) or less,
use at least 12 Gauge.

1. This McIntosh MA7000 Integrated Amplifier is de­signed for the connection of a single Loudspeaker per
amplifier channel, with an impedance of 2 ohms, 4
ohms or 8 ohms.

Note: The remaining Loudspeaker Terminals on the

Amplifier should not be connected to another
Loudspeaker.

2. Prepare the Loudspeaker Hookup Cables that attach to

the Amplifier by choosing one of the methods below:

Bare wire cable ends:
Carefully remove sufficient insulation from the cable
ends, refer
to figures
1, 2 &

3. If the
cable is
stranded,
carefully
twist the strands together as tightly as possible.

Note: If desired, the twisted ends can be tinned with

solder to keep the strands together, or attach spade
lug and/or banana connector.

How to Connect

out. Refer to figures 4, 5 & 6.
Banana plug connection:
Insert the banana plug into the hole at the top of the

termi­nal.
Refer
to fig­ures
A and
B.

Note: Banana Plugs are for use in the United States

and Canada only.

When making Loudspeaker Connections to the MA7000
refer to Connection Diagram located on the separate folded
sheet “Mc1B”. This an example of a typical audio system,
your system may vary from this, however the actual Loud­speakers would be connected in a similar manner.

3. Connect the Loudspeaker hookup cables from a single
Loudspeaker to the output terminals that match the im­pedance of the Loudspeaker, being careful to observe
the correct polarities. Output impedance connections
of 2 ohms, 4 ohms and 8 ohms are provided. If the
Loudspeaker’s impedance is in-between the available
connections, use the nearest lower impedance connec­tion.

WARNING: Loudspeaker terminals are hazardous live

and present a risk of electric shock.

4. Connect the MA7000 Power Cord to a live AC outlet.

Spade lug or prepared wire connection:
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 terminal so the wires cannot slip

9

LED illuminates during the time a re­mote command is sent to the MA7000

Press to Power the
MA7000 ON or OFF

Remote Control Push-Buttons

Press MODE to switch between
Stereo and Mono Modes

Turns AC Power ON or OFF to
certain McIntosh Components when
connected via the Data Port and any
McIntosh Components connected to
the ACC Power Control Jack

Switches OFF the en­tire MA7000 System

Use to select tuner presets, disc
tracks or any numbered operation

Selects AM Tuner Operating Func
tions and Disc Selection on certain
McIntosh Disc Players

Mutes the audio

Press to Power ON
the MA7000

Press to Power OFF
the MA7000

Selects FM Tuner Operating Func
tions and Track Selection on certain
McIntosh CD Players

-

Press to review Tuner Station Pre­sets and select certain functions on a
variety of McIntosh Components

Adjusts the volume level up or down

Selects On Screen Functions on a
variety of McIntosh Components

-

Selects a Disc Player, Music Server
or Tape Recorder Function and also
performs various functions on a
variety of McIntosh Components

Selects one of the seven
available Audio Sources

Note: Push-buttons whose function is not identified above

Selects the FF (Fast Forward) or
REWind Mode on a Disc Player,
Music Server or Tape Recorder;
tunes Up or Down the AM/FM
Dial

are for use with other McIntosh Products.

10

How to use the Remote Control

How to use the Remote Control

The supplied Remote Control is capable of directly con­trolling the functions of contemporary McIntosh Source
Components connected to the MA7000 via the Data Ports.

Input Source Selection

Press the appropriate Source Push-button to select the
desired program source.

Mute

Press the MUTE Push-button to mute the audio in all
outputs except the REC OUTPUT. The MUTE LED above
the push-button will f lash on and off to indicate that Mute
is active. To un-mute the audio, press the MUTE Push-but
ton again.

Mono

Press the MONO Push-button to switch from Stereo to
Mono for Monophonic listening.

Disc, Server and Tape Functions

Use these push-buttons to operate a DVD Player, CD
Player, CD Changer, Music Server or Tape Recorder.

Pause

Press the Pause Pushbutton to perform various functions
on a variety of McIntosh Components. It will also pause
the playing of a disc or tape player. The Pause Push-but­ton will also allow for quick exiting from the active menu
when in the setup mode. The Pause Push-button is also
used as an Enter Push-button with some McIntosh compo­nents

Acc On/Off

Press ACC ON to turn the power ON or ACC OFF switch
es AC Power ON or OFF to certain McIntosh Components
when connected via the Data Port and any McIntosh Com-

­ponents connected to the ACC Power Control Jack.

-

Numbered Push-buttons

Press Push-buttons 0 through 9 to access tuner station pre
sets, tracks on discs or selections on a Music Server.

Disc and Track

Use the DISC and TRACK Push-buttons when a Disc
Player or Music Server is being used.

Tuner Push-buttons

Press the AM or FM Push-button to select the desired
broadcast band. Press and release the Channel Up

 or
Down Push-button to move from station to station. Press
and hold a Channel Up or Down Push-button to move
continuously from station to station. Press +10 Push-button
to start the automatic brief audition of each of the pre­sets stored in the tuner memory. Press +10 Push-button a
second time to stop on a station preset and exit the review
process.

Volume

Press the Up

 or Down VOLUME Push-button to raise

or lower the listening volume level.

Note: The Record Signals present at REC OUTPUTS are not

affected by volume changes.

-

11

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Front Panel Displays, Controls, Push-buttons and Jack

Meter indicates the
Left Channel Out
put of the amplifier

BALANCE Control
allows adjustment of
the relative volume
balance between
channels

LED indicates when the

-

Left Channel Amplifier
POWER GUARD circuit
activates

The LEDs above
the push-buttons
indicate the current
source selected.

LED indicates when the
Right Channel Amplifier
POWER GUARD circuit
activates

Equalizer Controls
provide 12dB of boost
or cut at the center
frequencies indicated
above each control

VOLUME Control allows
adjustment of the listening
level for both channels

Meter indicates the
Right Channel Out
put of the amplifier

Standby Power

-

On Indicator

Source Push-buttons
select audio signals from
seven inputs for listening

IR Sensor receives
commands from a
Remote Control

12

Connection for low
impedance dynamic
headphones, for private
listening

MONO Push-button with
indicator combines the
Left and Right Channel
signals for Monophonic
Sound

OUTPUTS 1 and 2
Push-buttons with
indicators, turn the
Loudspeakers and
Preamplifier Output 2
On or Off

MUTE Push-button
with indicator, mutes
the audio from the
Loudspeakers and
Headphones

STANDBY/ON
Push-button switch­es the MA7000 ON
or OFF (Standby)
and resets the micro­processors

How to Operate the MA7000

Power On

The Red LED above the STANDBY/ON Push-button lights
to indicate the MA7000 is in Standby mode. To Switch
ON the MA7000, press the STANDBY/ON Push-button on
the Front Panel or the Power Push-button on the Remote
Control. The MUTE LED will light for approximately two
seconds after turn on. Refer to page 12 and figure 7.

Note: For an explanation of the Remote Control Push-but-

ton functions, refer to pages 10 and 11.

Source Selection

Select the desired source with the appropriate push-button
switch on the Front Panel or Remote Control.

Volume Control

Rotate the Front Panel VOLUME Control or use the
VOLUME Up
Control for the desired listening level.

Balance Control

Rotate the Front Panel BALANCE Control as needed to
achieve approximately equal listening volume levels in
each Loudspeaker. Rotate the BALANCE counterclock
wise to emphasize the Left Channel by reducing the level
of the Right Channel. Rotate the BALANCE clockwise to
emphasize the Right Channel by reducing the level of the
Left Channel.

Equalizer Controls

Each of the five Equalizer Frequency Controls will raise
or lower by approximately 12dB, the amplitude of the band
of frequencies centered at the frequency marked above the
controls. Both Left and Right Channels are affected. At the
center detent or flat position of the controls, all equalizer
circuit components are removed from the signal path.

Mono

Press the Front Panel MONO Push-button or the MODE
Push-button on the Remote Control to combine left and
right stereo signals to a Monophonic signal.

Note: The signals at the REC OUT Jacks are not affected.

Mute

Press the MUTE Push-button on the Front Panel or Remote
Control to mute the audio in all outputs except the REC
OUTPUT. The MUTE LED above the push-button flashes
to indicate that Mute is active. To un-mute the audio, press
the MUTE Push-button again, press the Remote Control
Volume Push-button(s) or press a Source Push-button.

 or Down Push-buttons on the Remote

-

How to Operate the MA7000

Headphones Jack

Connect a pair of dynamic
headphones to the Headphones
Jack for private listening. Press
the MUTE Push-button to
mute the Headphones; press
OUTPUT 1 and/or 2 Push-but­tons to mute the Loudspeakers.

Note: The Headphone Output

is optimized for imped­ances ranging from 16 to
250 ohms.

Power Output Meters

The MA7000 Power Output
Meters indicate the power
delivered to the Loudspeakers.
The meters respond to all the
musical information being pro­duced by the Amplifier. They
indicate to an accuracy of at
least 95% of the power output
with only a single cycle of a
2,000Hz tone burst.

Power Guard

During normal operation,
the Front Panel Power Guard
Indicators will momentarily
illuminate during peaks in the
audio signals. In the event the
MA7000 over heats, due to
improper ventilation and/or
high ambient temperature, the
internal protection circuits will
activate. The Front Panel Power
Guard Indicators will continu

­ously illuminate and the audio will be muted. When the
MA7000 has returned to a safe operating temperature,
normal operation will resume.

How To Make A Tape Recording

1. Select the signal you wish to record with the appropriate
Source Push-button.

2. Adjust the record level using the recorder volume con
trol and proceed with the recording process.

3. To listen to the playback of the program source just
recorded, press the REC Push-button.

Note: The MA7000 REC OUTPUTS are not affected by the

VOLUME or BALANCE controls.

Figure 7

-

13

How to Operate the MA7000, con’t

Using a Separate Power Amplifier

There are two different ways to use a separate power am­plifier with a MA7000. The first way is to use the separate
amplifier instead of the MA7000 built-in Power Amplifier.
Connect the Loudspeakers to the separate power amplifier
and remove the McIntosh Jumpers that are located between
the OUTPUTS 1 Jacks and the POWER AMP INput Jacks.
Refer to figure 8.

Note: The McIntosh Jumpers must be connected, between

the above mentioned jacks, when the MA7000 Internal
Power Amplifier is to be used.

The second way is to use both a separate power amplifier
and the MA7000 built-in Power Amplifier. Connect one
pair of Loudspeakers to the separate power amplifier and
the second pair to the MA7000. Refer to the MA7000 Out­put Connection Diagrams located on the separate folded
sheet “Mc1B” and figure 8 below.

Note: The MA7000 VOLUME Control will affect the sound

level of all the Loudspeakers.

How to Operate the MA7000, con’t

Reset of Microprocessors

In the unlikely event the controls of the MA7000 stop
functioning, the microprocessors can be reset by perform­ing the following:

1. Press and hold in the STANDBY/ON Push-button for
approximately five seconds.

2. When the MA7000 cycles On then Off, release the
STANDBY/ON Push-button.

3. When the STANDBY/ON LED is illuminated press the
STANDBY/ON Push-button, the MA7000 will resume
normal operation.

Note: This can be performed with the MA7000 On or in

the Standby Mode.

Using Output 2

The MA7000 has provisions for connecting an external
Power Amplifier (to drive Loudspeakers in another room)
and an external sensor for remote operation of the MA7000
from that room. With an external Power Amplifier con­nected (as illustrated on the McIntosh Connection Diagram
separate sheet “Mc1B”), press the Front Panel OUTPUT 2
Push-button or press on the Remote Control the 2nd Push­button followed by pressing the OUTPUT 2 Push-button to
switch On or Off the external Power Amplifier.

Jumpers

Figure 8

14

Figure 9

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.

A continuous average power output rating of 250 watts
and with an output current of greater than 50 amperes per
channel, making this the most advanced Integrated Ampli­fier McIntosh has ever manufactured. The distortion limits
for the MA7000 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 MA7000 are so low, it takes
special measuring techniques to make accurate readings.

Technical Description

The MA7000 can deliver the best possible performance
from any type of high quality loudspeaker system.

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.

Preamplifier Design Philosophy

All Audio Signal Switching in the MA7000 is done by 25
Electro-Magnetic devices. Electro-Magnetic Switching is
a proven technology that uses the latest in materials and
manufacturing methods. Each switch consists of a glass
tube that is filled with an inert oxygen-free atmosphere and

MA7000 Top View

15

sealed with tiny leads protruding
from either end. Refer to figure

10. These leads extend into the
tube and overlap one another
with a separation of a few thou­sandths of an inch. The leads are
made from a ferrous material that

Figure 10

is influenced by a magnetic field.
They are first plated with gold as a base material, then
with rhodium and finally ruthenium. Ruthenium is the best
contact material known.

The glass assembly is then placed in the center of a
multilayer coil of copper wire. The entire assembly is
molded together in a tough shock absorbing material. The
switch and coil connectors extend from the bottom in the
form of printed circuit board terminals. When a DC volt­age is applied to the coil, current flows and creates a mag­netic field. The force of the field causes the leads to bend
and contact one another inside the sealed glass tube. The
inert gas eliminates corrosion of the contacts and insures a
low resistance, distortion free switch.

All inputs, outputs, and data ports are controlled by
logic circuits in the MA7000. The logic is changed by
front panel push-buttons or by a microprocessor IR de­coder. This microprocessor IR decoder is programmed
with exclusive McIntosh software. It receives data from the
front panel or external sensors and provides the command
signals for input switching, data switching, and volume
control.

The equalizer section uses several high technology
operational amplifiers. The amplifier stage has been op­timized for the best transient performance and minimum
distortion. Five other operational amplifiers are arranged
in a circuit configuration that is the equivalent of a series
turned circuit. A control potentiometer inserts this series
tuned circuit into either the feedback or input section of the
equalizer amplifier. This provides a 12dB boost or cut at
the frequency of the tuned circuit. Refer to figure 11. The
overall gain of the stage is 0dB when the potentiometer is
at its center detent position. In this position the tone control
elements are completely removed from the signal path.

Power Amplifier Design Philosophy

The design philosophy incorporated in the MA7000
involved several different techniques, all based on sound
scientific logic. Every stage of voltage or current ampli

­fication 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

Figure 11

never accept the approximately 100 times higher distortion
of many non-feedback designs.

All transistors are selected to have nearly constant cur

­rent gain over the entire current range they must cover. The
12 Power Transistors used in each channel of the MA7000
Power Output Circuitry, have matched uniform current
gain, high current bandwidth product and a 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 12. This allows for the
instantaneous and accurate monitoring of the
Power Transistor Temperature. The MA7000
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 opera-

Figure 12

tion 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 signal of the circuit is coupled together
in the unique McIntosh MA7000 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 expertise of McIntosh in the design and
manufacturing of autoformers is legendary in the high
fidelity industry.

The high efficiency circuit design of the MA7000 con­tributes to low operating temperatures. More than 1,000
square inches of heat sink area keep the MA7000 operating
safely with convection cooling. No fans are needed.

ThermalTrak™ - is a trademark of Semiconductor Components Industries,
LLC (SCILLC)

16

Technical Description, con’t

Output
Transistor
Failure

Normal Operating Area

Normal Operating Area

Sentry Monitor

Sentry Monitor

Safety Area

Safety Area

Output
Transistor
Failure

Autoformers

All solid state power amplifier output circuits work best
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 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 Autoformer creates an ideal match between the
power amplifier output stage and the loudspeaker. Refer to
figure 13. 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. In the
rare event of a power ampli­fier output circuit failure,
the McIntosh Autoformer

Figure 13

provides absolute protection
from possible damage to your valuable loudspeakers.

Protection Circuits

The MA7000 incorporates its version of the McIntosh
Sentry Monitor output transis

­tor protection circuit. Refer to
figure 14. There is absolutely
no compromise in sonic per­formance with this circuit, and
it ensures safe operation of the
amplifier under even the most
extreme operating conditions.

Figure 14

The different types of protec­tion circuits incorporated in the MA7000 insure a long and
safe operating life.

The MA7000 also includes the unique patented McIn­tosh Power Guard circuit. Power Guard eliminates the pos­sibility of ever overdriving the ampli­fier into clipping. Refer to figures 15,
16 and 17. 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

Figure 15

it can damage valuable loudspeaker
system tweeters. You will never
experience the harsh and damaging
distortion due to clipping.

The Power Guard circuit is a
waveform comparator, monitoring
both the input and output wave

­forms. Under normal operating con­ditions, there are no differences be-

Figure 16

tween the shape of these waveforms.
If an amplifier channel is overdriven,
there will be a difference between
the two signal waveforms. When the
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

Figure 17

further increase in distortion. The
Power Guard circuit acts so fast that there are absolutely
no audible side effects and the sonic purity of the music
reproduction is perfectly preserved. The MA7000 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.

Power Supply Circuits

To compliment the design of the MA7000, there is a
high voltage power supply for both channels. The power
amplifiers draw high current from the AC power line.
Therefore, it is important that they plug directly into the
wall outlet. Turn on inrush current is cushioned by therm

­istors in the power transformer’s primary circuit. This soft
start eliminates component stress during turn-on.

The MA7000 can provide greater than 50 amperes peak
output current to drive uneven speaker loads. Some poor
speaker designs have input impedance that dip to 1 or 2
ohms at various frequencies and the MA7000 has the out­put current reserve to drive them. The MA7000 has main
filter capacitors that guarantee an excellent signal to noise
ratio and the energy storage necessary for a wide dynamic
range that music demands.

17

Specifications

Specifications

Power Output

250 watts is the minimum sine wave continuous average
power output per channel, both channels operating

Output Load Impedance

2, 4 or 8 ohms

Rated Power Band

20Hz to 20,000Hz

Total Harmonic Distortion

0.005% maximum with both channels operating from 250
milliwatts to rated power, 20Hz to 20,000Hz

Dynamic Headroom

2.0dB

Frequency Response

+0, -0.5dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz

Preamplifier Main Output (for rated input)

2.5V unbalanced (8V Maximun)

5.0V balanced (16V Maximun)

Sensitivity (for rated output)

High Level, 250mV unbalanced, 500mV balanced
Phono, 1.2 mV
Power Amp In, 2.5V

Signal To Noise Ratio (A-Weighted)

High Level, 100dB below rated output
Phono, 84dB below 5mV input
Power Amplifier, 115 below rated output

Intermodulation Distortion

0.005% maximum, if the instantaneous peak power is 500
watts or less per channel with both channels operating for
any combination of frequencies from 20Hz to 20,000Hz

Wide Band Damping Factor

Greater than 40

Maximum Input Signal

High Level, 8V unbalanced, 16V balanced
Phono, 45mV
Power Amplifier In, 16V

Main Output Impedance

50 ohms

Power Guard

Less than 2% THD with up to 16dB overdrive at 1,000Hz

Voltage Gain

High Level to Rec Output: 0dB
High Level to Main Output: 20dB
Phono to Rec Output: 46dB
Phono to Main Output: 66dB
Power Amplifier: 25dB

Equalizer Controls

Variable 12dB boost to 12dB cut at 30Hz, 150Hz, 500Hz,
1500Hz and 10,000Hz

Power Requirements

100 Volts, 50/60Hz at 8.0 amps
110 Volts, 50/60Hz at 7.2 amps
120 Volts, 50/60Hz at 6.6 amps
220 Volts, 50/60Hz at 3.3 amps
230 Volts, 50/60Hz at 3.3 amps
240 Volts, 50/60Hz at 3.3 amps
Standby: Less than 1 watt

Note: Refer to the rear panel of the MA7000 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,
Knobs and Cables

Weight

97.5 pounds (44.3 kg) net, 130.5 pounds (59.2 kg) in ship
ping carton

-

Input Impedance

High Level, 20K ohms
Phono, 47K ohms; 65pF
Power Amp In, 10K ohms

18

Shipping Carton Dimensions

Width is 29-1/2 inches (74.93cm)
Depth is 29 inches (73.66cm)
Height is 17 inches (43.18cm)

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 3. Please see the Part List for the
correct part numbers.

Quantity Part Number Description
1 034052 Shipping carton top
1 034051 Shipping carton bottom
2 034054 Foam Pad (top and bottom)
2 034186 Foam Pad (front and rear)
2 034187 Foam Pad (sides)

1 034136 Inner carton top
1 034137 Inner carton bottom
1 034188 Foam Pad (inner carton)
1 034264 Shipping skid
4 401212 1/4 - 20x2-1/4 cap screw
4 104058 Flat washer

19

McIntosh Laboratory, Inc.

2 Chambers Street

Binghamton, NY 13903

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. 04105200