McIntosh MC 7300 Manuale utente

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1

Indice

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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

next

step,

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.

Pin

configuration

for

the

XLR

INPUT

connectors

on

the

MC

7300.

PIN

1:

Shield

or

ground.

PIN

2:

+

output.

PIN

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

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