Mcintosh Mc 7300 User manual

IMPORTANT

SAFETY

INSTRUCTIONS

THESE

INSTRUCTIONS

ARE

TO

PROTECT

YOU

AND

THE

McINTOSH

INSTRUMENT.

BE

SURE

TO

FAMILIARIZE

YOURSELF

WITH

THEM.

1.

Read

all

instructions

-

Read

the

safety

and

operating

instructions

before

operating

the

instrument.

Retain

Instructions

-

Retain

the

safety

and

operating

instructions

for

future

reference.

Heed

warnings

-

Adhere

to

warnings

and

operating

instructions.

4.

Follow

Instructions

-

Follow

all

operating

and

use

instructions.

WARNING:

TO

REDUCE

RISK

OF

FIRE

OR

ELECTRICAL

SHOCK,

DO

NOT

EXPOSE

THIS

INSTRUMENT

TO

RAIN

OR

MOISTURE.

Power

Sources

-

Connect

the

power

supply

only

to

the

type

described

in

the

operating

instructions

or

as

marked

on

the

unit.

Power-Cord

Protection

-

Route

power-supply

cords

so

that

they

are

not

likely

to

be

walked

on

or

pinched

by

items

placed

upon

or

against

them,

paying

particular

attention

to

cords

at

plugs,

convenience

receptacles,

and

the

point

where

they

exit

from

the

instrument.

Ventilation

-

Locate

the

instrument

for

proper

ventilation.

For

example,

the

instrument

should

not

be

placed

on

a

bed,

sofa,

rug,

or

similar

surface

that

may

block

ventilation

openings;

or,

placed

in

a

built-in

installation,

such

as

a

bookcase

or

cabinet,

that

may

impede

the

flow

of

air

through

the

ventilation

openings.

Heat

-

Locate

the

instrument

away

from

heat

sources

such

as

radiators,

heat

registers,

stoves,

or

other

appliance

(including

amplifiers)

that

produce

heat.

Wall

or

Cabinet

Mounting

-

Mount

the

instrument

in

a

wall

or

cabinet

only

as

described

in

the

owners

manual.

10.

Water

and

Moisture

-

Do

not

use

the

instrument

near

water

-

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

laundry

tub,

in

a

wet

basement,

or

near

a

swimming

pool,

etc.

11.

Cleaning

-

Clean

the

instrument

by

dusting

with

a

dry

cloth.

Clean

the

panel

with

a

cloth

moistened

with

a

window

cleaner.

12.

Object

and

Liquid

Entry

-

Do

not

permit

objects

to

fall

and

liquids

to

spill

into

the

instrument

through

enclosure

openings.

~

9

S

е

м

e

so

13.

Nonuse

Periods

-

Unplug

the

power

cord

from

the

AC

power

outlet

when

left

unused

for

a

long

period

of

time.

14.

Damage

Requiring

Service

-

Service

must

be

«

performed

by

qualified

service

personnel

when:

A.

The

power

supply

cord

or

the

plug

has

been

damaged;

or

4

B.

Objects

have

fallen,

or

liquid

has

been

spilled

into

the

instrument;

or

C.

The

instrument

has

been

exposed

to

rain;

or

D.

The

instrument

does

not

appear

to

operate

nor-

mally

or

exhibits

a

marked

change

in

performance;

or

E.

The

instrument

has

been

dropped,

or

the

enclosure

damaged.

15.

Servicing

-

Do

not

attempt

to

service

beyond

that

described

in

the

operating

instructions.

АП

other

service

should

be

referred

to

qualified

service

personnel.

16.

Grounding

or

Polarization

-

Do

not

defeat

the

bs

inherent

design

features

of

the

polarized

plug.

Non-polarized

line

cord

adaptors

will

defeat

the

safety

provided

by

the

polarized

AC

plug.

17.

CAUTION:

TO

PREVENT

ELECTICAL

SHOCK

DO

NOT

USE

THIS

(POLARIZED)

PLUG

WITH

AN

EXTENSION

CORD,

RECEPTACLE

OR

OTHER

OUTLET

UNLESS

THE

BLADES

CAN

BE

FULLY

INSERTED

TO

PREVENT

BLADE

EXPOSURE.

ATTENTION:

POUR

PREVENIR

LES

CHOCS

ELECTRIQUES

PAS

UTILISER

CETTE

FICHE

POLARISEE

AVEC

UN

PROLONGATEUR,

UNE

PRISE

DE

COURANT

OU

UNE

AUTRE

SORTIE

DE

COURANT,

SAUF

SI

LES

LAMES

PEUVENT

ETRE

5

INSEREES

А

FOND

SANS

EN

LAISSER

AUCUNE

PAR-

TIE

A

DECOUVERT.

A

й

ў

The

lightning

flash

with

arrowhead,

within

ап

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.

CAUTION

RISK

OF

ELECTRIC

SHOCK

DO

NOT

OPEN

CAUTION:

TO

PREVENT

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK).

NO

USER-SERVICABLE

PARTS

INSIDE.

REFER

SERVICING

“ТО

QUALIFIED

PERSONNEL.

A

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.

\

E

go

?

The

serial

number,

purchase

date,

and

McIntosh

Laboratory

Service

Contract

number

are

important

to

you

for

possible

insurance

claim

or

future

service.

Record

this

information

here.

Вела

та

Serial

Number

p

ys

Purchase

Date

(ана

Service

Contract

Number

Upon

application,

McIntosh

Laboratory

provides

a

Service

Contract

to

the

original

purchaser.

Your

McIntosh

Authorized

Service

Agency

can

expedite

repairs

when

you

provide

the

Service

Contract

with

the

instrument

for

repair.

Copyright

1991

©

by

McIntosh

Laboratory

Inc.

Contents

INTRODUCTION

3

INSTALLATION

4,

5

HOW

ТО

CONNECT

INPUTS

6

CONNECTING

DIAGRAMS

7,8

HOW

TO

CONNECT

OUTPUTS

9,

10

FRONT

PANEL

CONTROLS

11

REAR

PANEL

12

PERFORMANCE

LIMITS

13

PERFORMANCE

CHARTS

14

TECHNICAL

DESCRIPTION

15,

16

BLOCK

DIAGRAM

17

Take

Advantage

of

3

Years

of

Contract

Service.

.

Fill

in

the

Application

NOW.

Your

MC

7300

Power

Amplifier

will

give

you

many

years

of

satisfactory

performance.

If

you

have

any

questions,

please

contact,

CUSTOMER

SERVICE

-

McIntosh

Laboratory

Inc.

2

Chambers

Street

Binghamton,

New

York

13903-2699

Phone:

607-723-3512

McINTOSH

THREE

YEAR

SERVICE

CONTRACT—

— — — —

—

)

An

application

for

A

THREE

YEAR

SERVICE

CONTRACT

is

included

with

this

manual.

The

terms

of

the

contract

are:

1.

If

the

instrument

covered

by

this

contract

becomes

defective,

McIntosh

will

provide

all

parts,

materials,

and

labor

needed

to

return

the

measured

perform-

ance

of

the

instrument

to

the

original

performance

limits

free

of

any

charge.

The

service

contract

does

not

cover

any

shipping

costs

to

and

from

the

authorized

service

agency

or

the

factory.

2.

Any

McIntosh

authorized

service

agency

will

repair

all

McIntosh

instruments

at

normal

service

rates.

To

receive

the

free

service

under

the

terms

of

the

service

contract,

the

service

contract

certificate

must

accompany

the

instrument

when

taken

to

the

service

agency.

3.

Always

have

service

done

by

a

McIntosh

authorized

service

agency.

If

the

instrument

is

modified

or

damaged

as

a

result

of

unauthorized

repair

the

service

contract

will

be

cancelled.

Damage

by

improper

use

or

mishandling

is

not

covered

by

the

service

contract.

4.

The

service

contract

is

issued

to

you

as

the

original

purchaser.

To

protect

you

from

misrepresentation

this

contract

cannot

be

transferred

to

a

second

owner.

5.

Units

in

operation

outside

the

United

States

and

Canada

are

not

covered

by

the

McIntosh

Factory

Service

Contract,

irrespective

of

the

place

of

.

purchase.

Nor

are

units

acquired

outside

the

USA

-

and

Canada,

the

purchasers

of

which

should

consult

with

their

dealer

to

ascertain

what,

if

any,

,

service

contract

or

warranty

may

be

available

i

locally.

де

|

~The

electrical

and

mechanical

design

of

the

MC

7300

power

amplifier

is

the

result

of

the

many

years

of

engineering

and

manufacturing

experience

of

the

design

staff

at

McIntosh.

This

"Know

How”,

along

with

the

meticulous

attention

to

design

and

production

details,

makes

the

MC

7300

one

of

the

finest

amplifiers

ever

produced

by

McIntosh

Laboratory.

The

use

of

10

complimentary

connected

output

transistors

per

channel,

allows

not

only

full

power

output

into

normal

loads,

but

extra

high

current

out-

-put

to

drive

uneven

speaker

loads.

Some

speaker

designs

have

impedance

characteristics

that

may

dip

to

as

low

as

1

or

2

ohms

at

certain

frequencies.

It

is

‘possible

for

the

MC

7300

to

deliver

as

much

as

85

amperes

peak

current

into

these

lower

impedance

loads.

The

MC

7300

will

supply

this

extra

current

output

with

complete

reliability

due

to

the

use

of

McIntosh

Sentry

Monitor

protection

circuits.

Some

power

amplifier

manufacturers

have

claimed

that

their

pro-

ducts

do

not

use

protection

circuits

since

they

com-

promise

performance.

The

real

genius

of

McIntosh

engineering

design

has

recognized

these

potential

problems

and

completely

eliminated

them.

Properly

designed

protection

circuits

assure

you

an

amplifier

.

hat

will

operate

under

all

types

of

user

conditions

with

maximum

reliability

and

freedom

from

possible

speaker

or

amplifier

damage.

The

benefits

of

these

designs

mean

you

own

an

amplifier

that

will

con-

tinue

to

operate

safely

for

many

years.

The

MC

7300

output

is

so

distortion

free,

it

is

dif-

ficult

to

measure

with

conventional

instruments.

The

performance

limit

is

0.005%

maximum

distortion,

yet

it

is

typical

for

an

amplifier

to

measure

less

than

0.00296

at

mid

frequencies.

The

power

output

watt

meters

on

the

MC

7300

are

peak

responding,

and

indicate

the

TRUE

power

out-

put

of

the

amplifier.

The

MC

7300

meter

circuits

are

constantly

measuring

both

voltage

and

current

delivered

into

the

speaker

loads.

A

speaker

may

have

a

different

load

impedance

at

different

frequencies,

resulting

in

a

change

of

output

current.

The

MC

7300

meters

properly

react

to

this

condition

and

indicate

Real

Output

power.

Other

desirable

features

are

included

such

as

high

current

gold

plated

output

terminals

that

will

accept

cable

up

to

0.204

inches

in

diameter.

Balanced

input

connectors

are

also

provided

in

addition

to

the

nor-

mal

RCA

inputs.

As

in

all

Mcintosh

power

amplifiers,

the

famous

patented

McIntosh

POWER

GUARD

circuit

is

includ-

ed.

You

never

have

to

be

concerned

with

amplifier

overdrive

when

playing

wide

dynamic

range

program

sources

such

as

compact

discs.

Refer

to

the

technical

description

for

a

full

account

of

all

the

outstanding

circuit

and

performance

features

of

this

superb

power

amplifier.

INTRODUCTION

3

LOCATION

The

MC

7300

may

be

installed

in

a

McIntosh

cabinet

or

custom

installed

in

furniture

of

your

choice.

Always

provide

adequate

ventilation.

The

trouble-free

life

of

an

electronic

instrument

is

greatly

extended

by

providing

sufficient

ventilation.

This

prevents

the

build-up

of

high

internal

temperatures

that

cause

deterioration

of

circuit

components.

Allow

enough

clearance

so

cool

air

can

enter

at

the

bottom

of

the

cabinet

and

be

vented

from

the

top.

Allow

at

least

1

1/2

inches

(3.8

cm)

above

the

amplifier

so

the

airflow

is

not

obstructed.

The

recommended

minimum

space

for

installation

is

17

inches

(43.2

cm)

wide,

16

inches

(40.7

cm)

deep,

(including

connectors),

and

8

inches

(20.3

cm)

high.

Allow

1

inch

(2.54

cm)

in

front

of

panel

for

knob

clearance.

CUSTOM

INSTALLATION

The

PANLOC

system

of

installing

equipment

conveniently

and

securely

is

a

product

of

McIntosh

research.

The

PANLOC

buttons

on

the

front

panel

will

lock

the

unit

firmly

in

place

when

turned

ap-

proximately

one-quarter

turn

clockwise.

A

one-

quarter

counterclockwise

turn

of

the

PANLOC

but-

tons

unlocks

the

chassis

from

its

mounting.

To

install

the

instrument

in

a

McIntosh

cabinet,

follow

the

instructions

that

are

enlcosed

with

the

cabinet.

For

any

other

type

of

installation

follow

these

instructions:

1.

Unpack

from

Carton

Open

the

carton

and

remove

the

PANLOC

brackets,

hardware

package,

and

mounting

template.

Remove

-

the

instrument

from

its

plastic

bag

and

place

it

up-

side

down

on

the

shipping

pallet.

Unscrew

the

four

plastic

feet

from

the

bottom

of

the

chassis.

2.

Mark

the

Cabinet

Panel

Tape

the

mounting

template

in

position

on

the

cabinet

panel

where

the

instrument

is

to

be

install-

ed.

The

broken

lines

that

represent

the

outline

of

the

rectangular

cutout

also

represent

the

outside

dimensions

of

the

chassis.

Make

sure

these

lines

clear

shelves,

partitions,

or

any

equipment.

With

the

template

in

place,

first

mark

the

six

A

and

B

holes

and

the

four

small

holes

that

locate

the

corners

of

the

cutout.

Then,

join

the

four

corner

markings

with

pencil

lines,

using

the

edge

of

the

template

as

a

straightedge.

3.

Drill

Holes

Use

a

drill

with

a

3/16

inch

(5

mm)

bit

held

perpen-

dicular

to

the

panel

and

drill

the

six

A

and

B

holes.

Then,

using

a

drill

bit

slightly

larger

than

the

tip

of

your

saw

blade,

drill

one

hole

at

each

of

two

diagonally

opposite

corners.

The

holes

should

barely

touch

the

inside

edge

of

the

penciled

outline.

Before

taking

the

make

sure

that

the

six

A

and

B

.

holes

have

been

drilled.

ud

ПЫ

ў

Кара

4.

Saw

the

Panel

Cutout

First

make

the

two

long

cuts

and

then

the

two

short

cuts.

After

the

rectangular

opening

has

been

cut

out,

use

a

file

to

square

the

corners

and

smooth

any

irregularities

in

the

cut

edges.

5.

Install

the

Mounting

Strips

In

the

hardware

package

are

two

mounting

strips,

and

two

4-40

x

1-1/4"

(31.8

mm)

black

screws

that

have

a

flat

head.

Use

these

screws,

one

on

each

end,

to

fasten

the

mounting

strips.

They

are

attached

..

through

the

center

hole,

marked

В

on

the

template.

Make

sure

the

screw

heads

are

drawn

flush

or

slight-

ly

into

the

wood

before

attaching

the

PANLOC

.

brackets.

6.

Attach

the

PANLOC

Brackets

Using

two

6-32

x

1-1/4"

(31.8

mm)

screws

in

the

A

holes

on

each

side,

attach

the

PANLOC

brackets

to

the

cabinet

panel;

the

short

flange

is

mounted

against

the

front

(face)

of

the

cabinet

panel.

The

screws

pass

through

the

PANLOC

bracket

flange,

the

cabinet

panel,

and

then

through

the

mounting

strips

previously

mounted.

7.

install

the

Instrument

Guide

the

AC

power

cord

through

the

panel

opening

to

the

back

of

the

cabinet;

then,

slide

the

instrument

into

the

opening

carefully

so

that

the

rails

on

the

bottom

of

each

side

of

the

chassis

engage

the

tracks

on

the

mounting

brackets.

Continue

to

slide

the

in-

strument

into

the

cabinet

until

the

front

panel

is

flush

with

the

cabinet

panel.

Turn

the

PANLOC

but-

tons

at

the

lower

left

and

right

corners

of

the

instru-

ment

panel

clockwise

to

lock

the

unit

firmly

in

the

cabinet.

Turn

the

PANLOC

buttons

counterclockwise

to

unlock

the

instrument.

It

can

then

slide

outward

to

permit

the

removal

of

the

instrument

from

the

cabinet.

INSTALLATION

5

CONNECTING

CABLES

Use

shielded

cables

to

connect

the

signal

from

the

preamplifier

or

other

signal

source

to

the

power

amplifier.

To

minimize

the

possibility

of

hum,

the

cables

should

be

located

away

from

speaker

connect-

ing

cables

and

AC

power

cords.

Use

good

quality

cables.

Your

dealer

can

advise

you

on

the

type

and

lengths

of

cables

that

will

best

suit

your

installation.

STEREO

OPERATION

(UNBALANCED

INPUTS)

Use

shielded

single

conductor

cable

with

RCA

type

plugs.

Connect

the

cable

from

the

left

channel

out-

put

of

a

preamplifier

to

the

LEFT

UNBALANCED

IN-

PUT

on

the

power

amplifier.

Connect

the

right

chan-

nel

output

to

the

RIGHT/MONO

UNBALANCED

INPUT.

Set

the

MODE

switch

to

STEREO.

STEREO

OPERATION

(BALANCED

INPUT)

Modern

technology

has

made

it

possible

to

build

preamplifiers

and

power

amplifiers

with

the

high

signal

to

noise

ratio

necessary

to

reproduce

the

sound

quality

present

on

compact

discs

or

any

other

wide

dynamic

range

signal

source.

It

is

possible

for

conventional

interconnecting

cables

to

pick

up

electrical

interference

from

other

equipment,

AC

cables

or

electrical

appliances.

Using

the

balanced

inputs

provides

an

additional

40dB

more

protection

against

such

noise

pickup.

Use

2

conductor

shielded

cables

with

XLR

type

connectors

to

connect

between

the

preamplifier

and

the

power

amplifier.

The

maximum

effect

of

balanc-

ed

cables

is

realized

when

both

the

preamplifier

and

power

amplifier

have

similar

XLR

balanced

connectors.

Connect

the

left

balanced

output

cable

from

a

preamplifier

to

the

LEFT

BALANCED

INPUT

on

the

power

amplifier.

Connect

the

right

output

to

the

RIGHT

BALANCED

INPUT.

configuration

for

the

XLR

INPUT

connectors

on

the

MC

7300.

1:

Shield

or

ground.

2:

+

output.

3:

-

output.

In

stereo

installations

where

the

amplifier

and

preamplifier

are

close

to

each

other

and

require

in-

terconnecting

cables

of

six

feet

or

less,

using

quality

unbalanced

connecting

cables

is

usually

perfectly

satisfactory.

If

the

units

are

farther

apart

and

require

longer

interconnecting

cables,

using

balanced

cables:

-

will

give

extra

protection

from

noise

or

interference.

MONOPHONIC

BRIDGE

OR

PARALLEL

A

rear

panel

MODE

switch

allows

the

amplifier

to

be

used

in

normal

STEREO,

MONO

(BRIDGE)

or

MONO

(PARALLEL).

When

switched

to

either

MONO

(BRIDGE),

or

MONO

(PARALLEL)

operation,

the

RIGHT

BALANCED

and

UNBALANCED

inputs

are

the

only

ones

used

for

the

mono

input

signal.

The

LEFT

inputs

are

automatically

disconnected.

Connect

the

appropriate

cable

from

a

preamplifier

or

other

mono

source

to

the

appropriate

RIGHT

UNBALANCED

or

BALANCED

amplifier

input.

6

HOW

TO

CONNECT

INPUTS

14

2.5

SENSITIVITY

момо

ш!

SWITCH

AT

2.5V

PLACE

MODE

SWITCH

MONO

IN

STEREO

кай

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PARALLEL

^

STEREO

CONNECTIONS

INPUT

SENSITIVITY

PLACE

INPUT

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PREAMPLIFIER

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OHM

8

OHM

SPEAKER

E

MONO

BRIDGE

CONNECTIONS

INPUT

SENSITIVITY

PLACE

INPUT

NON

14

2.5

SENSITIVITY

BRID

SWITCH

AT

2.5V

PLACE

MODE

SWITCH

2:

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IN

MONO

(BRIDGE)

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OUTPUT

RIGHT

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8

OHM

SPEAKER

CONNECTING

DIAGRAMS

7

MONO

PARALLEL

CONNECTION

MONO

BRIDGE

MONO

INPUT

SENSITIVITY

1.4

2.5

PLACE

MODE

SWTICH

IN

MONO

(PARALLEL)

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RIGHT

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4

OHM

SPEAKER

PLACE

INPUT

SENSITIVITY

SWITCH

AT

2.5V

8

CONNECTING

DIAGRAM

NA

^

The

McIntosh

output

circuit,

superior

in

its

performance,

demands

a

superior

method

of

coupling

the

amplifier

output

to

the

loudspeaker

load.

The

MC

7300

incorporates

McIntosh

designed

and

manufactured

Autotransformers

to

insure

peak

performance

and

protection,

as

well

as

outstanding

compatibility

between

amplifier

and

speakers.

The

MC

7300

Output

Autotransformers

have

3

dif-

ferent

output

impedance

taps

for

optimum

matching

to

the

particular

speaker

or

combination

of

speakers

.

being

used.

Use

the

following

table

to

determine

which

tap

should

be

used.

It

may

be

desirable

to

consult

your

dealer,

or

the

manufacturer

of

your

.

Speaker

for

the

best

impedance

tap

to

use.

SPEAKER

IMPEDANCE

AMPLIFIER

OUTPUT

IN

OHMS

CONNECTIONS

1.6

to

32

Common

and

2

ohm

outputs

3.2

to

6.4

Common

and

4

ohm

outputs

6.4

and

up

Common

and

8

ohm

outputs

Use

high

quality

speaker

cables.

The

total

resistance

of

the

cables

must

be

as

low

as

possible,

so

larger

diameter,

(lower

gauge

number),

cables

are

most

desirable.

The

longer

the

speaker

cable

is,

the

·

lower

the

gauge

number

must

be

to

keep

resistance

Aow.

RECOMMENDATIONS

FOR

SPEAKER

CABLE

LENGTHS

AND

GAUGE

(SIZE)

These

speaker

cable

lengths

represent

a

resistance

equal

to

approximately

5%

of

the

speaker

im-

pedance.

The

cable

sizes

are

the

minimum

that

should

be

used.

If

there

is

a

choice,

the

larger

diameter

cables,

(Lower

gauge

number),

should

be

used.

For

4

Ohm

Load

For

8

Ohm

Load

Wire

Feet

Meters

Feet

Meters

Gauge

15

4.6

30

9.1

18

25

7.6

50

15.2

16

40

12.2

80

24.4

14

60

18.3

120

36.6

12

100

.

30.5

200

61.0

10

“

STEREOPHONIC

OPERATION

Connect

a

cable

from

the

left

speaker

common

ter-

minal

to

the

amplifier

LEFT

OUTPUT

LC

terminal.

Connect

a

cable

from

the

left

speaker

hot

terminal

to

the

amplifier

LEFT

OUTPUT

L

(impedance

tap

desired)

terminal.

Connect

the

right

speaker

in

an

identical

manner

to

the

amplifier

RIGHT

OUTPUT

terminals

of

the

cor-

rect

impedance

for

your

speakers.

If

the

actual

load

impedance

of

a

speaker

is

lower

than

the

specified

impedance,

particularly

at

dif-

ferent

parts

of

the

frequency

range,

it

will

cause

no

problems.

The

high

current

output

capacity

of

the

MC

7300

will

produce

the

extra

current

necessary

to

properly

drive

the

speaker

under

these

conditions.

If

the

impedance

of

the

speaker

is

higher

than

the

8

ohm

tap,

no

change

in

performance

quality

will

occur.

The

available

power

output

will

simply

be

slightly

less.

The

common

and

hot

terminals

of

both

speakers

in

a

stereo

installation

must

be

connected

in

an

identical

manner

to

the

proper

amplifier

output

terminals.

This

is

essential

for

keeping

both

speaker

systems

operating

IN

PHASE.

This

means

that

the

driving

surfaces

of

each

channel

speaker

system

will

move

back

and

forth

together.

Almost

all

speakers

have

their

hot

and

com-

mon

terminals

color

coded,

with

red

usually

as

hot.

BE

SURE

THE

REAR

PANEL

MODE

SWITCH

15

SET

TO

STEREO

The

MC

7300

can

be

used

to

feed

a

constant

voltage

line,

often

used

in

background

music

ap-

plications.

For

a

25

volt

line,

use

the

2

ohm

outputs

on

the

amplifier.

Because

the

crosstalk

between

channels

on

the

MC

7300

is

almost

non

existent,

each

channel

can

be

used

as

a

separate

monophonic

amplifier.

An

exam-

ple

would

be

one

channel

feeding

background

music

to

a

given

area,

and

the

other

channel

used

for

pag-

ing

in

a

different

area.

Е

MONOPHONIC

BRIDGE

OPERATION

The

MC

7300

can

be

used

as

a

single

channel

monophonic

power

amplifier

in

bridge

configuration.

The

two

amplifier

channel

outputs

add

together

in

series

when

used

in

MONO

(BRIDGE).

The

MODE

switch

connects

the

right

channel

inputs

to

both

power

amplifiers,

with

the

phase

of

the

left

channel

inverted

to

get

bridge

operation.

The

speaker

con-

nections,

both

common

and

hot,

should

be

con-

nected

only

to

the

left

and

right

amplifier

output

im-

pedance

taps

as

shown.

The

common

amplifier

out-

put

connections

are

not

used

in

MONO

(BRIDGE)

configuration.

For

example,

the

two

8

ohm

outputs

will

add

together

to

become

16

ohms.

HOW

TO

CONNECT

OUTPUTS

9

To

maintain

Ше

mono

output

of

the

amplifier

in

phase

with

the

input

signal

in

MONO

(BRIDGE)

opera-

tion,

connect

the

hot

speaker

terminal

to

the

RIGHT

channel

impedance

tap

and

the

common

speaker

ter-

minal

to

the

LEFT

channel

impedance

tap.

SPEAKER

IMPEDANCE

AMPLIFIER

OUTPUT

IN

OHMS

CONNECTIONS

|

3.2

to

6.4

L2

and

R2

(4

ohms

total)

6.4

to

10 L4

and

R4

(8

ohms

total)

10

and

higher

L8

and

R8

(16

ohms

total)

MAKE

SURE

THE

REAR

PANEL

MODE

SWITCH

IS

SET

TO

MONO

(BRIDGE)

AND

USE

ONLY

A

RIGHT

INPUT

MONOPHONIC

PARALLEL

OPERATION

The

MC

7300

also

can

be

used

as

a

single

channel

monophonic

power

amplifier

in

parallel

configura-

tion.

The

amplifier

output

taps

are

now

connected

in

parallel

and

the

impedances

will

be

exactly

half

what

is

stated

at

the

terminals.

Connect

a

cable

from

the

speaker

common

ter-

minal

to

either

the

LEFT

OUTPUT

LC

terminal

or

the

RIGHT

OUTPUT

RC

terminal.

(These

terminals

are

wired

together

inside

the

amplifier.)

Connect

the

cable

from

the hot

speaker

terminal

to

the

im-

pedance

output

desired

on

either

channel.

Also

wire

across

to

the

other

channel

identical

impedance

tap.

In

each

case,

the

chosen

outputs

of

each

channel

must

be

wired

together.

SPEAKER

IMPEDANCE

AMPLIFIER

OUTPUT

IN

OHMS

0.8

to

1.6

LC

+

RC

and

L2

+

R2,

(1

ohm)

1.6

to

3.2

LC

+

RC

and

14

+

К4,

(2

ohms)

3.2

and

up

LC

+

RC

and

18

+

КВ,

(4

ohms)

MAKE

SURE

THE

REAR

PANEL

MODE

SWITCH

IS

SET

TO

MONO

(PARALLEL)

AND

USE

ONLY

A

RIGHT

INPUT.

ALWAYS

BE

CERTAIN

TO

PLACE

THE

MODE

SWITCH

IN

THE

CORRECT

POSITION

FOR

THE

MODE

OF

OPERATION

BEING

USED.

HOW

TO

CONNECT

AC

POWER

The

MC

7300

is

designed

to

operate

on

120

volts

50/60

Hz.

Plug

the

AC

power

cord

directly

into

a

wall

outlet.

Make

certain

that

the

AC

power

outlet

has

at

least

12

amperes

capacity

available.

If

you

choose

to

connect

the

amplifier

AC

power

to

the

back

AC

í

outlet

on

a

preamplifier

or

other

accessory,

make

certain

it

can

supply

12

amperes

of

current.

The

MC

7300

can

draw

up

to

12

amperes

of

cur-

rent

from

the

AC

power

line

when

both

channels

are

producing

rated

power

output.

The

amplifier

uses

only

0.6

amperes

of

current

when

idling

at

no

output.

The

AC

auxiliary

outlet

on

the

amplifier

rear

panel

will

provide

up

to

100

watts

(1

ampere),

and

is

not

fused

or

switched.

FUSE

A

15

ampere

fuse

protects

the

MC

7300

circuits.

The

fuse

does

not

protect

additional

equipment

con-

nected

to

the

rear

panel,

auxiliary

AC

outlet.

ardt

10

HOW

TO

CONNECT

OUTPUTS

Й

jPOWER

OUTPUT

METERS

The

MC

7300

power

output

meters

respond

9596

full

scale

to

a

single

cycle

of

a

2,000Hz

tone

burst.

Both

voltage

and

current

are

electronically

measured

and

fed

to

a

special

circuit

that

accelerates

the

pointer

movement

in

the

upward

direction.

When

the

meter

pointer

reaches

its

peak,

it

is

time

stretch-

ed

to

pause

just

long

enough

to

be

read,

and

then

drops.

The

upper

scale

on

the

meters

is

calibrated

in

average

watts

power,

and

the

lower

scale

in

decibels.

The

meter

calibration

marks

reading

from

right

to

left,

starting

at

the

300

watt

indication,

are

as

follows:

300

Watts,

(Indicated)

120

Milliwatts

120

60

30

(Indicated)

30

(Indicated)

12

6

3

(Indicated)

3

(Indicated

1.2

12

0.3

0.6

0.3

(Indicated)

Two

additional

calibration

marks

above

300

watts

аге

on

the

meters.

The

first

is

600

watts,

(+

Зав),

and

"the

second

is

1200

watts,

(+

6dB).

The

power

amplifier

cannot

produce

a

continuous

1200

watts

of

power,

but

can

produce

well

beyond

300

watts

on

program

peaks,

especially

into

lower

impedance

speaker

loads.

In

MONO

operation

the

two

meters

will

read

iden-

tical

power

levels.

The

total

mono

power

output

of

the

amplifier

will

be

the

sum

of

these

readings.

METER

WATTS/HOLD

In

the

METER

WATTS

position,

the

meters

respond

to

all

the

musical

information

being

produced

by

the

amplifier

and

read

to

an

accuracy

of

at

least

9596

of

the

power

output

of

either

amplifier

channel.

In

the

METER

HOLD

position,

the

meter

pointer

is

locked

to

the

highest

power

peak

in

a

sequence

of

peaks.

The

meter

is

electronically

held

to

this

power

.

level

until

another

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.

LEFT

GAIN

Use

the

LEFT

GAIN

control

to

adjust

the

output

in

the

left

channel

to

the

desired

listening

level.

RIGHT/MONO

GAIN

Use

the

RIGHT/MONO

САМ

control

to

adjust

the

output

in

the

right

channel

to

the

desired

listening

level.

When

the

amplifier

is

connected

for

monophonic

operation,

the

RIGHT/MONO

GAIN

control

is

used

to

control

the

combined

monophonic

outputs

of

both

channels.

FOR

THE

BEST

SIGNAL

TO

NOISE

RATIO

WHEN

USING

McINTOSH

PREAMPLIFIERS,

PLACE

THE

IN-

PUT

SENSITIVITY

SWITCH

ON

THE

REAR

PANEL

OF

THE

AMPLIFIER

TO

THE

2.5V

POSITION

AND

TURN

BOTH

FRONT

PANEL

GAIN

CONTROLS

TO

THE

MAX-

IMUM

OR

FULLY

CLOCKWISE

POSITIONS.

If

your

needs

require

more

input

sensitivity

from

the

amplifier,

slide

the

INPUT

SENSITIVITY

switch

to

the

1.4

volt

position

and

adjust

the

GAIN

controls

as

needed.

In

the

1.4

volt

position,

turning

the

gain

controls

halfway

will

result

in

the

same

amplifier

sen-

sitivity

as

the

2.5

volt

position

with

full

gain.

POWER

The

POWER

switch

turns

the

MC

7300

ON

or

OFF.

The

switch

does

not

control

the

auxiliary

AC

outlet

on

the

rear

panel.

If

you

wish

to

control

the

MC

7300

AC

power

from

another

source

such

as

a

preamplifier

or

switching

relay,

leave

the

switch

in

the

ON

position.

FRONT

PANEL

CONTROLS

11

MODE

SWITCH

Provides

STEREO,

MONO

(BRIDGE)

or

(PARALLEL)

operation.

INPUT

SENSITIVITY

SWITCH

Provides

an

amplifier

sensitivity

of

1.4V

or

2.5V.

When

the

MC

7300

is

being

used

with

a

McIntosh

preamplifier,

set

the

INPUT

SENSITIVITY

SWITCH

to

the

2.5V

position

and

turn

the

front

panel

GAIN

controls

to

maximum.

The

1.4V

sensitivity

can

be

us-

ed

when

additional

gain

is

needed

for

special

applications.

BALANCED

AND

UNBALANCED

INPUTS;

SPEAKER

OUTPUTS;

AC

OUTLET;

FUSE

Refer

to

other

sections

of

this

manual

for

the

proper

connections

and

operations

of

the

inputs

and

outputs.

МОРЕ

CAUTION

zorne

Mit

Infosh

mc7300

ee

mono

аа

вят

ана

DIGITAL

DYNAMIC

STEREO

POWER

AMPLIFIER

STEREO

—

|

[

“ома

МИМТОБН

LABORATORY

INC.,

BINGHAMTON,

NY

13903

MADE

IN

U.S.A.

TYPE

AND

RATING

FUSE,

ATLENTIQN,

аван

ч

.

SERIAL

NO.

REMPLACER

PAR

UN

FUSIBLE

DE

МЕМЕ

TYPE,

AMPERAGE

INPUT

SENSITIVITY

ET

VOLTAGE.

б

аба

WARNING

aisk

or

HAZARDOUS

ENERGY!

SEE

ў :

OPERATING

MANUAL.

DO

NOT

OPERATE

WITHOUT

OUT-

PUT

TERMINAL

COVÉR

IN

PLACE.

AVERTISSEMENT

ENERGIE

ELECTRIQUE

K

DANGEREUSE.

МОЈА

LA

NOTICE

DE

FONCTIONNEMENT.

BRIOGE

|

R/MONO

INPUTS

120V

LEFT

RIGHT/MONO

50/60Hz

100W

or

1A

MAX

B

A

ENS

~

LEFT

OUTPUT

НЕ

fe)

©

z

L4

Я

L—

онвлрднсво

—!

КА

BALANCED

==]

12

REAR

PANEL

Rajz

РЕКЕОКМАМСЕ

СЏАКАМТЕЕ

Performance

limits

аге

the

maximum

deviation

from

perfection

permitted

for

a

McIntosh

instrument.

We

promise

you

that

when

you

purchase

a

new

MC

7300

from

a

McIntosh

franchised

dealer,

it

will

be

capable

of,

or

can

be

made

capable

of,

perfor-

mance

at

or

exceeding

these

limits

or

you

can

return

the

unit

and

get

your

money

back.

STEREO

POWER

OUTPUT

300

watts

into

8,

4,

or

2

ohm

loads

is

the

minimum

_.

sine

wave

continuous

average

power

output

per

channel

from

20Hz

to

20,000Hz

with

both

channels

operating.

The

output

RMS

voltage

is:

49.0

across

8

ohms

34.6

across

4

ohms

24.5

across

2

ohms

MONO-BRIDGE

POWER

OUTPUT

600

watts

into

a

16,

8

or

4

ohm

load

is

the

minimum

sine

wave

continuous

average

power

output

from

20Hz

to

20,000Hz.

The

output

RMS

voltage

is:

98.0

across

16

ohms

69.3

across

8

ohms

49.0

across

4

ohms

.

MONO-PARALLEL

POWER

OUTPUT

*

600

watts

into

a

4,

2

or

1

ohm

load

is

the

minimum

'sine

wave

continuous

average

power

output

from

20Hz

to

20,000Hz.

The

output

RMS

voltage

is:

49.0

across

4

ohms

34.6

across

2

ohms

24.5

across

1

ohm

OUTPUT

LOAD

IMPEDANCE

STEREO

8,

4

or

2

ohms

by

connecting

to

the

proper

out-

put

terminals.

MONO

16,

8,

4,

2

or

1

ohms

by

connecting

to

proper

out-

put

terminals.

,

TOTAL

HARMONIC

DISTORTION

STEREO

0.005%

maximum

harmonic

distortion

at

any

power

level

from

250

milliwatts

to

rated

power

per

channel

from

20Hz

to

20,000Hz,

both

channels

operating.

MONO

0.005%

maximum

harmonic

distortion

at

any

power

level

from

250

milliwatts

to

rated

power

from

20Hz

to

20,000Hz.

INTERMODULATION

DISTORTION

STEREO

0.005%

maximum

if

instantaneous

peak

per

output

does

not

exceed

twice

the

output

rating

per

channel,

with

both

channels

operating,

for

any

combination

of

frequencies

from

20Hz

to

20,000Hz.

MONO

0.005%

maximum

if

instantaneous

peak

power

out-

put

does

not

exceed

twice

the

output

rating

for

any

combination

of

frequencies

from

20Hz

to

20,000Hz.

FREQUENCY

RESPONSE

(at

one

watt

output)

+0,

–

0.254В

from

20Hz

to

20kHz

+0,

—3.0dB

from

10Hz

to

100kHz

HUM

AND

NOISE

(A-weighted)

105dB

below

rated

output

IHF

DYNAMIC

HEADROOM

1.9dB

DAMPING

FACTOR

Greater

than

40

INPUT

IMPEDANCE

20,000

ohms

Unbalanced

40,000

ohms

Balanced

INPUT

SENSITIVITY

Switchable

for

either

1.4

or

2.5

volts

POWER

REQUIREMENTS

120

volts,

50/60Hz,

0.6

to

12

amperes

MECHANICAL

INFORMATION

SIZE

16

3/16

inches

wide

(41.1

cm)

by

7

1/8

inches

high

(18.1

cm)

by

15

9/16

inches

deep

(40.0

cm),

including

-

connectors.

Knob

clearance

required

is

1

inch

(2.54

cm)

in

front

of

mounting

panel.

FINISH

The

front

panel

is

a

combination

of

glass

and

black

anodized

aluminum.

The

chassis

is

black.

WEIGHT

79

pounds

(35.8

kg)

net,

97

pounds

(44

kg)

in

shipping

carton.

Harmonic

Distortion

vs

Frequency

-

300

Watts

Per

Channel,

8

Ohm

Load

-

Harmonic

Distortion

vs

Power

040

938

bo

caini:

A

.030

ша

лала

н

-

8

Ohm

Output

-

PERCENT

DISTOHTION

100

200

300

ik

2k

Зк 4k

10k

20k

FREQUENCY

IN

HERTZ

Frequency

Response

at

8

Ohm

Output,

1

Watt

INPUT

SENSITIVITY:

2.5V

-----

140

^

AUDIO

OUTPUT

IN

dB

10

100

1k

10k

100k

FREQUENCY

IN

HERTZ

Intermodulation

Distortion

vs

Power

-

8

Ohm

Output

-

.040

FOU

EE

Кара

зё

EDS

vs

035

be

Qi.

030

Г...

De

Des

Pbi...

:

025

[.....

ae

ops

Lasts

:

.020

|----:

с

зърна

EE

:

PERCENT

DISTORTION

200

300

0.2 0.3

`

04

ее

10

77

100

1000

РОЖЕН

ІМ

МАТТ5

14

PERFORMANCE

CHARTS

Ke

tem

ni

me

=

020

l

x

up

г.

015

E

DS

M

|

Vm

m

em

Em

Tis

xis

Е

PERCENT

DISTORTION

Ec

T

ET

o:

"7^

1

10

100

220209

090

POWER

IN

WATTS

Output

Power

vs

Load

Impedance

m

-

Continuous

-

ak

|

ава

а A

НЕННЕ

"n

n

ect

d

t

TEE

AVERAGE

POWER

IN

WATTS

=

РИ

па

E

С

ere

E

а

А

ПА

100

аб

0.1

1.0

10

LOAD

IMPEDANCE

IN

OHMS

Output

Power

vs

Load

Impedance

-

20mS

Dynamic

-

10k

[—

ak

bisce

non

crees

Н

Ma

tee

$

Aha

ак

Pee

E

:

AVERAGE

POWER

IN

WATTS

=

04

10

"

LOAD

IMPEDANCE

IN

OHMS

ОМЕЕ

GUARD

Power

Guard,

a

unique

feature

of

McIntosh

amplifiers,

assures

that

each

channel

of

the

MC

7300

will

deliver

full

power

free

of

clipping

distortion.

Clipping

is

caused

when

an

amplifier

is

asked

to

pro-

duce

more

power

output

than

its

design

is

capable

of

delivering

with

low

distortion.

Amplifiers

that

are

overdriven

may

deliver

large

quantities

of

power

when

they

are

clipping,

but

they

may

have

more

than

4096

harmonic

distortion.

In

this

mode,

the

sound

is

grossly

distorted

and

the

extra

energy

con-

~

tent

of

the

clipped

signal

will

damage

most

loud-

speakers.

The

McIntosh

Power

Guard

circuit

protects

your

ears

and

your

speakers

from

this

kind

of

damage.

The

Power

Guard

circuit

consists

of

a

waveform

comparator

which

monitors

the

wave

shape

of

the

amplifier

input

and

output

signals.

Normally,

there

is

no

disparity

between

these

signals

and

the

com-

parator

produces

no

output.

When

the

amplifier

is

driven

beyond

its

maximum

power

capacity,

a

dif-

ference

will

develop.

If

the

disparity

exceeds

0.3%

(equivalent

to

0.39

total

harmonic

distortion),

the

comparator

output

causes

the

amber

Power

Guard

indicator

to

light.

If

there

is

a

further

increase

in

the

~

врату,

the

comparator

output

controls

an

elec-

г

onic

attenuator

at

the

amplifier

input

to

reduce

the

amplifier

gain,

thus

holding

the

amplifier

output

to

a

low

distortion

value.

Overdrive

by

14dB

is

possible

before

the

output

distortion

exceeds

296.

SENTRY

MONITOR

All

power

transistors

have

limits

for

the

maximum

amount

of

power

they

can

handle.

The

MC

7300

out-

put

transistors

and

power

supply

have

been

design-

ed

to

allow

very

high

current

flow

into

properly

matched

load

impedances.

If,

however,

a

short

cir-

cuit

or

very

low

value

of

load

impedance

is

applied

to

the

output

of

the

MC

7300,

destructive

current

levels

could

be

reached

if

it

was

not

controlled

by

the

Sentry

Monitor

circuit.

This

circuit

senses

the

“dynamic

operating

time,

voltage,

and

current

of

the

amplifier

output

stage

and

controls

the

current

flow

confining

it

to

nondestructive

limits.

Sentry

Monitor

does

not

limit

the

power

output

available

from

the

amplifier.

THERMAL

CONTROL

АП

power

transistors

have

limits

for

the

maximum

amount

of

heat

they

can

tolerate.

The

MC

7300

uses

a

highly

efficient

amplifying

circuit

which

produces

relatively

little

heat

for

the

output

power

produced.

The

amplifier

has

4

oversized

heatsinks

to

dissipate

tran-

sistor

generated

heat.

Natural

convection

air

flow

is

suf-

ficient

for

cool

operation.

Should

the

cooling

air

be

blocked

or

should

the

amplifier

operating

temperature

become

too

high,

thermal

cutouts

within

the

amplifier

will

turn

off

the

power

to

the

amplifier.

When

the

amplifier

has

cooled,

it

will

automatically

turn

on

again.

TURN-ON

DELAY

The

MC

7300

has

a

turn-on

delay

circuit

that

delays

amplifier

operation

for

about

2

seconds

after

power

turn-on.

This

prevents

pops

or

thumps

generated

in

other

equipment

from

causing

annoying

noises

or

damaging

your

loudspeakers.

DIRECT

CURRENT

FAILURE

PROTECTION

The

autotransformer

protects

speakers

from

damage

in

the

event

of

amplifier

failure.

Should

a

direct

current

component

appear

in

the

output,

it

is

shunted

by

the

autotransformer

and

DC

cannot

reach

the

speaker.

POWER

LINE

INRUSH

PROTECTION

Turn-on

inrush

current

is

cushioned

by

thermistors

in

the

power

transformer

primary

circuit.

A

soft

start

is

achieved

that

eliminates

component

stress

during

turn-on.

CIRCUIT

OPERATION

The

audio

input

passes

through

the

gain

control

to

a

preamplifier.

The

output

amplifier

is

driven

by

the

preamplifier.

The

power

output

amplifier

uses

two

stages

of

voltage

amplification

followed

by

three

stages

of

cur-

rent

amplification.

All

stages

are

complementary

balanced.

Even

number

harmonics

are

cancelled

by

the

balanced

circuits.

This

means

that

the

amplifying

stages

have

less

total

harmonic

distortion

and

less

negative

feedback

is

required

to

achieve

ultra

low

distortion.

The

signal

is

fed

to

one

input

of

the

balanced

dif-

ferential

stage.

Feedback

from

the

amplifier

output

is

applied

to

the

other

input.

The

differential

amplifiers

drive

a

balanced

cascode

connected

voltage

amplifier

stage.

Current

mirrors

are

also

used

to

improve

bandwidth

and

linearity.

The

cascode

voltage

amplifier

output

feeds

com-

plementary

Darlington

connected

driver

transistors.

These

supply

the

signal

to

10

complementary

con-

nected

output

transistors

per

channel.

Ancillary

com-

ponents

for

Power

Guard,

Sentry

Monitor,

Power

Output

Meters

and

other

protection

circuits

inter-

TECHNICAL

DESCRIPTION

15

connect

with

the

amplifier

circuits.

The

power

supply

uses

a

massive

power

transformer,

full

wave

bridge

rectifiers,

and

large

filter

capacitors

having

227

joules

of

energy

storage.

Four

large

heatsinks

provide

cool-

ing

for

the

20

output

power

transistors.

The

mechanical

and

electrical

design

of

the

MC

7300

is

the

result

of

the

many

years

of

engineer-

ing

and

manufacturing

experience

held

by

the

staff

at

McIntosh.

This

"know

how",

the

meticulous

atten-

tion

to

design

and

production

details,

makes

the

MC

7300

one

of

the

finest

amplifiers

ever

produced

by

McIntosh

Laboratory.

ми

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BLOCK

DIAGRAM

17

McIntosh MC 7300 User manual

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