Yamaha MX-50 User manual

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MANUAL

OWNER

English

............

Francais

Deutsch

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Svenska

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Thank

you

for

purchasing

the

YAMAHA

MX-50

stereo

power

amplifier.

ABOUT

THIS

MANUAL

`

To

obtain

the

finest

performance

from

your

new

power

amplifier,

please

read

this

manual

carefully,

keeping

1t

handy

for

future

reference.

After

vou

know

which

PRECAUTIONS

to

take,

the

section

CON-

NECTIONS

will

show

you

how

to

hook

up

the

MX-50

to

your

control

amplifier

and

speakers.

Operation

of

this

power

amplifier

is

explained

under

FRONT

PANEL

CONTROLS

AND

THEIR

FUNCTIONS.

If

you

have

any

trouble,

the

final

section

on

TROUBLESHOOTING

tells

you

what

to

do

before

contacting

your

YAMAHA

dealer.

CONTENTS

IMPORTANT:

Please

record

the

serial

number

of

your

unit

in

the

space

below.

Model:

MX-50

Serial

No.:

FEATURES

Hyperbolic

Conversion

Class

A

Circuit

High

Dynamic

Power

Two-Pair

Speaker

Support

LED

Power

Level

Meters

Overload

Protection

Circuitry

Hyperbolic

Conversion

Class

A

Circuit

This

new

kind

of

circuitry,

developed

by

Yamaha,

eliminates

the

only

serious

drawback

of

A

operation

amplifiers.

These

had

to

switch

to

non-linear

class

AB

operation

above

a

certain

load

current,

causing

a

slight

deterioration

in

the

otherwise

excellent

sound

quality.

The

new

Hyperbolic

Conversion

Class

A

circuit

does

away

with

this

problem,

allowing

your

Yamaha

MX-50

to

deliver

pure

class

A

operation

constantly,

without

switching

or

cut-off,

over

its

entire

power

range.

Keep

this

manual

in

a

safe

place

for

future

reference.

Avoid

placing

your

MX-50

in

direct

sunlight

or

close

to

a

source

of

heat

Also

avoid

io-

cations

in

which

the

device

is

likely

to

be

subjected

to

excessive

dust,

cold

or

mois-

ture.

The

openings

on

the

cabinet

ensure

the

ventilation

of

the

amplifier.

If

these

openings

are

obstructed,

the

temperature

inside

the

cabinet

will

rise

rapidly

and

eventually

damage

the

circuits.

Therefore,

avoid

plac-

ing

objects

against

these

openings

and

do

not

install

your

amplifier

in

a

place

such

that

the

flow

of

air

through

the

ventilation

openings

could

be

impeded.

ASO

Së

Power

cord

When

removing

the

power

plug

from

the

wall

outlet,

always

pul!

directly

on

the

plug.

Never

yank

the

cord

as

this

may

result

in

damage

to

the

cord

and

possibly

a

short-circuit.

if

you

do

not

intend

to

use

this

unit

for

an

extended

period

of

time,

it

is

advisable

to

unplug

the

power

cord.

=

Switches

and

knobs

Avoid

applying

excessive

force

to

the

switches

and

knobs.

|

Relocation

Before

moving

your

amplifier,

be

sure

to

unplug

the

power

cord

and

remove

all

other

connecting

cables.

KH

Troubleshooting

Chart

Consult

the

Troubleshooting

Chart

for

advice

on

the

common

operation

errors

before

concluding

that

your

amplifier

is

faulty.

BW

Servicing

Do

not

open

the

cabinet

or

attempt

to

make

repairs

by

yourself,

as

this

may

aggravate

the

damage

and

expose

you

to

an

electrical

shock.

Object

and

liquid

entry

See

to

it

that

foreign

objects

or

spilled

liquids

do

not

enter

inside

the

cabinet.

Should

this

case

arise,

consult

your

YAMAHA

dealer.

Wipe

off

dust

with

a

dry

soft

cloth.

To

remove

dirt

or

fingermarks,

use

a

soft

damp

cloth

then

dry

immediately

with

a

clean

cloth.

Do

not

use

alcohol,

thinners

or

other

chemical

solvents

since

they

may

damage

the

finish

or

remove

the

panei

lettering.

Do

not

use

any

aerosol

sprays

near

this

unit

as

these

products

can

easily

get

into

the

unit

and

damage

the

circuitry.

Special

instructions

for

the

U.K.

THE

WIRES

IN

THE

MAINS

LEAD

ARE

COLOURED

IN

ACCORDANCE

WITH

THE

FOLLOWING

CODE:

|

Blue:

NEUTRAL

Brown:

LIVE

As

the

colours

of

the

wires

in

the

mains

lead

of

this

apparatus

may

not

correspon

with

the

coloured

markings

identifying

th

terminals

in

your

plug,

proceed

as

follow:

The

wire

which

is

coloured

BLUE

must

b

connected

to

the

terminal

which

is

marke

with

the

letter

N

or

coloured

BLACK.

Th:

wire

which

is

coloured

BROWN

must

be

connected

to

the

terminal

which

is

marke

with

the

letter

L

or

coloured

RED.

CONNECTION

DIAGRAM

SCHEMA

DES

CONNEXIONS

€

CONTROL

AMPLIFIER

AMPLIFICATEUR

DE

CONTROLE

HAUPTVERSTARKER

KONTROLLFORSTARKARE

AMPLIFICATORE

DI

CONTROLLO

GUA

ne

mins

ans

num

me

m

=

==

PREOUT

YAMAHA

viso

>

al

ESOWATTS

z

SOHz

~

YAMAHA

CORPORATION

©

© ®

8

®

A

110

O

©

(LL.

18

ANSCHLUBDIAGRAMM

SCHEMA

DI

COLLEGAMENTO

KOPPLINGSDIAGRAMMET

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SPEAKERS

A

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A

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i

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SPEAKERS

B

ENCEINTES

B

Ja

HOGTALARNA

B

SPEAKER

B

LAUTSPRECHERBOXENPAAR

A

LAUTSPRECHERBOXENPAAR

B

CONNECTIONS

`

@

CONTROL

AMPLIFIER

@

SPEAKERS

A

@

SPEAKERS

B

NOTE:

|

Before

making

or

altering

any

of

the

connections

described

below,

be

sure

to

turn

off

the

power

of

the

MX-50.

Making

sure

that

the

control

amplifier

is

also

turned

off,

connect

the

output

jacks

of

your

control

amplifier

to

the

corresponding

INPUT

jacks

on

the

rear

panel

of

this

unit.

Always

check

that

a)

the

RCA

plugs

of

the

connecting

cord

are

clean,

b)

the

left

and

right

channels

of

both

units

correspond,

c)

connections

are

secure,

and

d)

both

units

are

properly

grounded.

if

possible,

use

only

speakers

indicated

on

the

rear

panel

the

SPEAKERS

terminals

and

with

adequate

power

handling

capacity.

Driving

speakers

with

extremely

low

impedance

(or

two

4

ohm

pairs)

at

full

power

may

cause

the

protection

circuit

to

activate.

When

connecting

the

speaker

cords,

observe

the

“+”

and

“—”

markings

on

the

backs

of

the

speakers

and

MX-50.

If

the

“+”

and

“_”

polarities

are

reversed,

the

sound

will

be

unnatural

and

lack

bass.

Speaker

cords

should

be

cut

as

short

as

possible.

Do

notcoil

up

exces:

cord

or

bundle

it

with

cables

from

other

components.

e

Strip

approximately

10

mm

(3/8”)

insulation

from

the

ends

of

the

speaker

cords:

Partly

unscrew

the

plastic

wire

holders.

Insert

th:

stripped

ends

of

the

speaker

cords

as

shown

and

retighten

the

holders.

RED

for

(+)

s

BLACK

for

(—)

NN

9

FRONT

PANEL

CONTROLS

AND

THEIR

FUNCTIONS

|

The

Front

Panel

illustration

is

provided

on

page

32.

|

€

SPEAKERS

selector

switches:

Allow

you

to

select

one

or,

by

setting

both

switches

to

ON,

both

of

the

speaker

pairs

connected

to

the

-

A

and

B

terminals.

@

METER

switch:

Activates

the

power

peak

meter.

This

display

is

not

illuminated

when

the

METER

switch

is

in

the

OFF

position.

@

LEFT

and

RIGHT

LEVEL

controls:

These

give

you

independent

control

over

the

power

output

levels

to

the

L

and

R

speakers.

This

allows

you

to

preset

speaker

balance

for

optimum

stereo

imaging.

These

controls

can

also

serve

to

protect

speakers

with

power

handling

capacity

lower

than

this

amplifier’s

rated

output.

€

POWER

switch

and

indicator:

Pressing

this

switch

turns

power

on,

causing

the

POWER

indicator

to

light.

To

turn

the

unit

off,

press

again.

|

@

PROTECTION

indicator:

Lights

for

several

seconds

after

power

is

turned

on,

showing

that

the

internal

protection

circuitry

is

currently

activated.

This

mutes

the

output

signal

to

the

speakers,

preventing

the

loud

noise

otherwise

heard

when

switching

on

the

amplifier.

|

@

Power

peak

meter:

Indicates

the

power

output

on

a

logarithmically

compressed

scale

from

0.06

to

900

watts,

independently

for

the

left

and

right

output

channels.

Readings

are

accurate

for

8

ohm

speakers

only.

en

TROUBLESHOOTING

Before

assuming

that

your

amplifier

is

faulty,

check

the

following

list.

If

you

still

have

any

doubts

or

questions,

contact

your

nearest

YAMAH.

dealer.

|

No

power

even

when

the

e

The

power

cord

is

not

plugged

in

securely.

e

Plug

in

securely.

POWER

switch

is

ON.

No

sound

is

heard

from

the

left

|

e

The

speaker

cords

are

not

properly

connected.

|

e

Check

speaker

connections

and

correct

them.

and/or

right

speaker(s).

|

Pr

(s)

e

Either

or

both

LEVEL

controls

are

set

to

—

dB.

e

Adjust

the

appropriate

LEVEL

control(s).

e

The

cords

from

the

control

amplifier

are

notsecure.

|

e

Connect

them

securely.

e

The

control

amp's

balance

is

set

to

the

extreme

left

|

e

Adjust

the

control

amp's

balance

control.

or

right.

The

sound

ceases

suddenly,

e

The

speaker

protection

circuit

has

activated.

e

Turn

power

OFF,

then

ON

again

to

resetthe

speake

and

the

PROTECTION

indicator

protection

circuit.

Alsó

see

CONNECTING

SPEAK

is

lit.

|

ERS

on

p.

4.

e

There

is

a

malfunction

in

the

amplifier.

e

Consult

your

YAMAHA

dealer.

Unnatural

sound

lacking

bass.

|

e

The

speaker

polarities

are

reversed.

`

|

E

e

Connect

the

speaker

wires

with

the

correct

+

an

—

polarity.

SPECIFICA

Minimum

RMS

Output

Power

Per

Channel

20Hz

~

20kHz

0.003%

THD,

8

ohms

125W

0.007%

THD,

6

ohms

150W

Dynamic

Power

Per

Channel

(by

IHF

Dynamic

Headroom

measuring

method)

|

8

ohms

|

175W

6

ohms

|

220W

4

ohms

|

290W

2

ohms

=

390W

1

ohm

|

420W

DIN

Standard

Output

Power

Per

Channel

1kHz,

1%

THD,

4

ohms

215W

Power

Band

Width

0.03%

THD

62.5W,

8

ohms

10Hz

~

60kHz

Damping

Factor

1kHz,

8

ohms

70

Input

Sensitivity/

Impedance

MAIN

IN

1.14V/60kO

Frequency

Response

(20Hz

~

20kHz)

+0,

—0.2dB

Total

Harmonic

Distortions

(20Hz

~

20kHz)

MAIN

IN

to

Sp

Out,

62.5W/80

0.003%

intermodulation

Distortion

Rated

Output/8

ohms

0.003%

Signal

to

Noise

Ratio

(IHF-A-Network)

|

MAIN

IN

(shorted)

123dB

MAIN

IN

(5.1kQ

terminated)

=

119dB

Residual

Noise

(IHF-A-Network)

16uV

Channel

Separation

(Vo1-30dB)

Input

shorted,

terminated,

|

89dB/70dB

1kHz/10kHz

Power

Supply

Europe

AC220V,

50Hz

U.K.

AC240V,

50Hz

Power

Consumption

650W

435

x

165

x

420mm

(17-1/8”

x

6-1/2”

x

16-47/64”)

Dimentions

(W

x

H

x

D)

Weight

.

|

13kg

Specifications

subject

to

change

without

notice.

Yamaha MX-50 User manual

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